ROUSH Blue Bird Vision Propane Diagnostic Manual
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ROUSH Blue Bird Vision Propane Diagnostic Manual

Gen 4 propane, 6.8l ford v10
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Blue Bird Vision Propane
Gen 4 Propane, 6.8L Ford V10
Service and Diagnostic Manual

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Summary of Contents for ROUSH Blue Bird Vision Propane

  • Page 1 Blue Bird Vision Propane Gen 4 Propane, 6.8L Ford V10 Service and Diagnostic Manual...
  • Page 2 The information in this publication was accurate and effective at the time the publication was approved for publishing and is subject to change without notice or liability. ROUSH CleanTech reserves the right to revise the information herein and to make changes and discontinue production of described parts at any time.

  • Page 3: Table Of Contents

    MAINTENANCE AND SPECIFICATIONS ....ROUSH CleanTech Transfer Kit ....
  • Page 4 P027B — Fuel Pump Module “B” Control Circuit Range/ Utilizing the ROUSH Diagnostic Tool ....Performance ........
  • Page 5 2020 Diagnostic Codes ......_____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 6: Foreward

    FOREWARD UPDATES This manual is intended to provide technicians with the diagnostic Updates to the Blue Bird Vision with the Gen 4 ROUSH CleanTech and service procedures required to maintain and service the Liquid Propane Autogas Service and Diagnostic Manual: unique components for the ROUSH CleanTech Propane fuel system.

  • Page 7: Reference

    Key On Engine Running Liquid Petroleum Autogas Engine Directions A quick reference of the engine directionals used in this manual Engine Rear Engine Right Engine Le� Engine Front _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 8: Important Safety Information

    Failure to heed this danger could result in severe personal injury or death. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 9: Introduction

    This manual is a supplement to the Blue Bird Vision Propane service nozzle. There are two (2) types of fill nozzles and valves used for...

  • Page 10: Installation, Garaging, And Training

    OPD to automatically prevent tank. filling the tank beyond the maximum recommended capacity of _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 11: Vehicle Filling Procedure

    If using the threaded fill valve and nozzle, carefully and slowly unscrew the fueling nozzle (counterclockwise). b. If using the quick connect nozzle, pull the nozzle away _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 12: Opd Inspection Procedure

    Example: A functioning OPD on a tank with a 100 gallon WC will stop before five (5) gallons (100 WC x .05 = 5) have been added after the mist is visible. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 13: Blue Bird Vision Propane Fuel Rails

    • A fuel pressure and temperature sensor (IPTS) is mounted on the left hand fuel rail. Fuel Rail Supply Line Le Hand Rail Assembly Bracket Supply Line Fuel Rail Return Line Right Hand Rail Assembly Integrated Pressure Temperature Sensor (IPTS) _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 14: Blue Bird Vision Propane Fuel Tanks

    Service and Diagnostic Manual, 6.8L Ford Engine Blue Bird Vision Propane Fuel Tanks Fuel tanks are available in 47, 67, and 93 gallon usable capacity applications for Blue Bird Vision Propane buses with the ROUSH CleanTech fuel system. The fuel tank(s) are either located side saddle on the driver side or aft of the rear axle. The following components are mounted to the outside of the fuel tank: Bleeder Valve (Fixed Liquid Level Gauge), Supply Valve Assembly, Return Valve Assembly, Pressure Relief Valve, OPD with check valve, and Fuel Level Sender Assembly and Twinsight.

  • Page 15: Roush Cleantech Optional Ultra Low Nox Catalyst

    Ford model, but has a ROUSH CleanTech badge. For removal and installation of the low NOx and ultra low NOX catalyst follow the exhaust section of the Blue Bird service manual. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 16: Roush Cleantech Evaporative Emissions System

    ROUSH CleanTech Evaporative Emissions System The ROUSH CleanTech evaporative emissions system is used for multiple applications for this vehicle. The evaporative system incorporates most of the standard Ford evaporative system, including the evaporative or charcoal canister, but re-purposes them for a propane application.

  • Page 17: Special Tools

    Ford recommends that the block heaters are only used in areas where the temperature drops to -20°F or lower. Manual Fuel Shutoff Valve _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 18: Fuel Line Purging/Depressurization

    NOTE: There may still be a small amount of propane vapor in the lines after running this procedure. Open the lines slowly and cautiously to bleed off any remaining propane. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 19: Fuel Tank Draining Procedure

    (2) amps, immediately turn the switch propane provider or ROUSH CleanTech (800) 59-ROUSH (597-6874). to OFF to avoid damage to the pumps. Note, a large _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 20: Verifying Tank Depressurization

    2. Ensure the negative battery terminal is disconnected to prevent ignition of a potentially combustible air/fuel mixture 3. Ensure all loosened lines and fittings are re-torqued to their _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 21: Fuel System Priming Procedure

    3. Turn the key to the START position. When you hear the fuel pumps activate, slowly open the manual fuel shutoff valve. 4. If vehicle cranks but does not start, close the manual fuel shutoff valve and repeat the process. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 22: Fuel Tank Removal And Replacement

    11. Remove four (4) tank support cross members, leaving the forward most cross member attached. 12. With the help of an assistant, slide tank rearward out of the back of the bus. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 23: Tank Cover Plate

    Fuel System Priming Procedure. NOTE: Sealant should not be required for installation of a new component. If pipe thread sealant is required, use only PLS-2 or Everseal 183. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 24: Tank Supply Valve Assembly

    9. Remove and discard the O-Ring from bottom of tank supply valve. NOTE: When replacing the tank supply valve assembly, the tank seat O-ring must be replaced. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 25: Tank Return Valve Assembly

    9. Remove the return hose from the return valve assembly quick connect fitting. NOTE: When replacing the tank return valve assembly, the tank seat O-ring must be replaced. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 26: Tank Fill Valve/Overfill Prevention Device (Opd)

    Procedure. Failure to do so could result in severe personal injury or death and/or damage to property. 4. Remove the tank fill line and 90 degree fitting. 5. Remove the fill valve/OPD. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 27: Tank Pressure Relief Valve (Prv)

    If pipe thread sealant is required, use only PLS-2 6. Check all fittings for leaks using an electronic leak detector or Everseal 183. or leak detection solution. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 28: Supply Line Filter

    8. Discard the O-ring. 5. Tighten the mounting clamp. 6. Leak check the filter and lines using an electronic leak detector or leak detection solution. Perform the Fuel System Priming Procedure. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 29: Fuel Pump Assembly

    Fuel Pump kit to the outside of the Access Flange. For MY 2019 or newer, no sticker is required. Note: The Fuel Pumps are serviced as an assembly. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 30: Fuel Level Sender (Fls) Twinsight

    Fuel System Priming Procedure. 10. Check the tank service cover for leaks using an electronic leak detector or leak detection solution. 11. Perform the Fuel System Priming Procedure. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...
  • Page 31 7. Purge the fuel tank using the Fuel Tank Purging Procedure. 8. Leak check using an electronic leak detector or leak detection solution. Purge the fuel tank using the Fuel Tank Purging Procedure. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 32: Gateway Module

    8. Check the base of the solenoid again post for leaks using an electronic leak detector or leak detection solution. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 33: Fuel Rail Pressure Control Module (Frpcm) And Frpcm

    4. Connect the vapor line. 5. Perform the Fuel System Priming Procedure. 6. Leak check all FRPCM connection using an electronic leak detector or leak detection solution. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 34: Fuel Rails

    9. Leak check all spacer tubes and fuel lines connections on the 4. Leak check the IPTS with an electronic leak detector or leak fuel rail assembly using an electronic leak detector or leak detection solution. detection solution. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 35: Torque Chart

    10 Nm (7.4 ft-lb) Nut (with washer and data 5.5 Nm (47.5 in-lb) tag) 91 + Orientation to 12 o’clock, not to exceed 130Nm Fill Filter line 57 Nm (42 ft-lb) _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 36: System Maintenance

    • Check to insure the service valves or shut off valves are functioning and manually closes the valve. Q) How long will it take to fill my ROUSH CleanTech System fuel tank? • Check to insure the pressure relief valve vent is clear of any obstructions and is properly orientated.

  • Page 37: Service

    For a quick connect (Euro-style), the filler nozzle quick connects to the fill valve. Q) Can I perform my own service or repair on the Roush CleanTech System? Allow a station attendant to refuel your vehicle if you are not trained A) Not recommended.

  • Page 38: Troubleshooting - Starting

    If the Start In Progress message does illuminate, but does not crank, call Blue Bird customer service. • If it cranks and does not start, refer to the Crank No Start pinpoint test in this manual. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 39: Maintenance And Specifications

    ROUSH CleanTech service or repair to liquid propane autogas systems may result System. The supply valve is located on the bottom of the ROUSH in personal injury, harm, or loss or damage to property. Contact CleanTech System fuel tank;...

  • Page 40: Storing The Vehicle

    ROUSH CleanTech Customer Success at (800) 59-ROUSH (597-6874), Opt. 2 with any questions regarding ROUSH CleanTech Liquid Propane Autogas Systems. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 41: Utilizing The Roush Diagnostic Tool

    Gateway Module use. Transmit Vehicle Information to the ROUSH Customer Success team For any other questions please contact ROUSH CleanTech Customer Success Team at (800) 59-ROUSH (597-6874), Opt. 2. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 42: Rdt Pid Screen For Gen 4 Vehicles

    ROUSH CleanTech Gen 4 Blue Bird Vision Propane ____________________________________________________________________________________________________________ Service and Diagnostic Manual, 6.8L Ford Engine * Denotes Most Commonly Used RDT PID Screen for Gen 4 Vehicles* _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 43: Rdt Pid List For Gen 4 Vehicles (List)

    Flow Control Solenoid fault bit (Flag) MUX_RPR_FCS_FAULT **RDT is routinely updated to optimize performance and bring on new features. This screen is subject to change based upon updates and new features. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 44: Diagnostic Trouble Codes

    EVAP System Leak Detected (large leak) P0456 EVAP System Leak Detected (very small leak) P0461 Fuel Level Sender “A” Circuit Range/Performance P0462 Fuel Level Sender “A” Circuit Low _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 45: Diagnostic Trouble Codes Explained

    Check the FRPCM and Gateway Module electrical for damage, corrosion and water intrusion. Action Refer to the Fuel Rail Pressure Control Module Electrical Check procedure in Diagnostic Tests and Procedures. Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 46: P009E/P26B3 - Fuel Pressure Relief Control Performance

    Verify that no fuel system faults are present and then follow the Ford Powertrain Control/Emissions Diagnosis Service Manual procedure. Action Refer to the Engine Stumble, Stall, Rough Idle AND Fuel Pressure Drop procedure in Diagnostic Tests and Procedures. Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 47: Respectively)

    Verify the fuel rail temperature PID value to determine open or short. Action Refer to the Injection Pressure Temperature Sensor Electrical Check procedure in Diagnostic Tests and Procedures. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 48: P0183 - Fuel Temperature Sensor "A" Circuit High

    A FRP PID value during ignition ON, engine OFF, or ignition ON, engine running is less than 0.3 volt. This indicates a concern is present. Action Refer to the Injection Pressure Temperature Sensor Electrical Check procedure in Diagnostic Tests and Procedures. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 49: P0193 - Fuel Rail Pressure Sensor Circuit High

    Verify the Propane Tank Fuel Pressure PID value to determine open or short. Action Refer to the Tank Pressure Temperature Sensor Electrical Check procedure in the Diagnostic Tests and Procedures. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 50: Low

    Verify the Fuel Temperature PID value to determine open or short. Action Refer to the Tank Pressure Temperature Sensor Electrical Check procedure in the Diagnostic Tests and Procedures. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 51: Circuit Intermittent/Erratic

    Possible Causes Refer to the Ford Powertrain Control/Emissions Diagnosis Service Manual for a list of other causes. Symptom — Diagnostic Aid Action Refer to the Fuel Pump Control Module Electrical Continuity Test procedure in Diagnostic Tests and Procedures. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 52: P03Xx - Misfire

    EVMV indicates 1,000 mA (100% duty cycle for EVAPCP) and a voltage drop of 3 volts minimum is normal. Action Refer to the Blue Bird Wiring Diagram in Vantage and Ford Powertrain Control/Emissions Diagnosis Service Manual for more information. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 53: P0446 - Evap System Vent Control Circuit

    ON, engine OFF or ignition ON, engine running indicates a concern is present. Action Refer to the Blue Bird Wiring Diagram in Vantage and Ford Powertrain Control/Emissions Diagnosis Service Manual for more information. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 54: P0453 - Evap System Pressure Sensor/Switch High

    EVAP canister with engine running. Action Refer to the Blue Bird Wiring Diagram in Vantage and Ford Powertrain Control/Emissions Diagnosis Service Manual for more information. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 55: P0456 - Evap System Leak Detected (Very Small Leak)

    Smart Relay Module (Gateway Module) reads fuel level sender and broadcasts to the PCM and Instrument Cluster. Action Refer to the following tests located later in this manual. • Gateway Module Electrical Check • Fuel Level Sender Electrical Check _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 56: P0627 - Fuel Pump "A" Control Circuit Open

    The P116E code is meant as an indication that the fuel system was operated at the limits of the system. The customer may have experienced drive issues although the system is performing as expected. Action Refer to the Maximum Pressure Check procedure in Diagnostic Tests and Procedures. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 57: P1450 - Unable To Bleed Up Bleed Fuel Tank Vacuum

    Verify that no fuel system faults are present and then follow the Ford Powertrain Control/Emissions Diagnosis Service Manual procedure. Action Refer to the Ford Powertrain Control/Emissions Diagnosis Service Manual for more descriptive information. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 58: P25B0 - Fuel Level Sensor "A" Stuck

    Measuring and Recording Duty Cycle, Fuel Rail Pressure, Fuel Rail Target Pressure, and Duty Cycle procedure. Action Refer to the Engine Cranks, No Start procedure in Diagnostic Tests and Procedures. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 59: P2665 - Supply Solenoid Circuit Fault

    Check the FRPCM and Gateway Module electrical connectors for damage, corrosion and water intrusion. Check for power at the Gateway Module. Action Refer to the Gateway Module Electrical Check procedure in Diagnostic Tests and Procedures. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 60: U0109, U016C - Lost Communication With Fuel Pump Control

    • No power to the EFPR “B” • Gateway Module fault • CAN fault • Blown fuse • RCM failure • EFPR “B” failure Symptom — Diagnostic Aid — Action — _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 61: Diagnostics And Pinpoint Tests

    3. Select the rf_dc PID from the screen and click on Start. time, the tank (fuel) can be much warmer and so higher pressures 4. Record the value. are to be expected. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 62: Pinpoint Test A: No Fill

    Does the temperature and pressure differ from the chart? No — Allow vehicle to cool and then retest. If still no, contact ROUSH CleanTech Customer Success (800) 59-ROUSH (597- 6874), Opt. 2. Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 63: Pinpoint Test B: Slow Fill

    (597-6874), Opt. 2. using an infrared temperature gun. No — Allow vehicle to cool and then retest. If still no, call ROUSH Does the temperature and pressure differ from the chart? CleanTech Customer Success at (800) 59-ROUSH (597-6874), Opt. 2.

  • Page 64: Pinpoint Test C: Opd Test

    Once liquid (seen as a white mist) is visible at the Bleeder Valve, note the number of gallons filled. Fueling should stop before the calculated 5% volume is reached. If additional 5% is reached, stop fueling as vehicle is over filling and contact ROUSH CleanTech Customer Success (800) 59-ROUSH (597-6874), Opt.

  • Page 65: Pinpoint Test D: Engine Does Not Crank

    No — Determine the cause of the low battery situation. Call ROUSH CleanTech Customer Success at (800) 59-ROUSH (597- 6874), Opt. 2 if more assistance is needed. Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 66: Pinpoint Test E: Engine Cranks, No Start

    Yes — Continue to the next step. Is Excess Flow Valve (EFV) functioning properly? No — Refer to the Tank Supply Valve Replacement Procedure replace the supply valve. Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...
  • Page 67 Measure and record amp draw on the fuel pump connectors. Amp draw should be between 2 and 10amps at idle. Amperage should be similar between the two pumps. Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 68: Fuel Pressure Drop

    Pin-A and Pin-B of both Fuel Pump Connectors, tank pass- and replace Fuel Pump Assembly. through side. No — Move to the next step. If you do not have Roush Diagnostic Is the resistance value OL or greater than 5ohms? Tool (RDT), continue to the next step.
  • Page 69 80psi over tank AND problem occurs after No — Refer to Ford Powertrain Control/Emissions Diagnostics heavy duty cycle operation? Service Manual. Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 70: Pinpoint Test G: Excess Flow Valve (Efv) Check

    When the EFV resets there will be an audible click. Note: Vehicle may cycle pumps multiple times during start up flush sequence. Is EFV continuously checking during normal operation? Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 71: Pinpoint Test H: Maximum Pressure Check

    Refer to the Tank Pressure Temperature chart below. No — Vehicle is working properly; inform and explain operating characteristics to customer. Temperature (°F) Pressure (psi) Min. Nominal Max. Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 72: Pinpoint Test I: Fuel System Fails To Bleed

    Disconnect the FRPCM and wait 120 minutes. g. Measure fuel rail pressure and fuel tank pressure. Does fuel rail pressure rise more than 10 psi (69 kPa)? Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 73: Pinpoint Test J: Tank Solenoid Electrical Check

    Blue Bird PDU. Refer to the Blue Bird Service Manual for wiring diagrams and schematics. Is there good continuity in the circuit? Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 74: Pinpoint Test K: Return Valve Procedure

    No — Repair ground circuit wiring. Check continuity between: • Pin 2, connector C4 and Pin 11, connector C1 (tank harness). Is there good continuity in the circuit? Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 75: Pinpoint Test L: Fuel Rail Pressure Control Module

    Check continuity between: No — Repair ground circuit wiring. • Pin2, connector C6 and Pin 33, connector C1 Is there good continuity between the two pins? Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 76: Pinpoint Test M: Injection Pressure Temperature Sensor

    • Pin-2, connector C3 and pin-20, connector C1 • Pin-3, connector C3 and pin-18, connector C1 • Pin-4, connector C3 and pin-25, connector C1 Is there good continuity in the circuits? Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 77: Pinpoint Test N: Tank Pressure Temperature Sensor Electrical

    Call ROUSH CleanTech Customer Success at (800) 59-ROUSH for more diagnostics. (597-6874), Opt. 2 to verify the calibration is up-to-date. No — Update the calibration. Is the calibration up-to-date? _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 78: Continuity Test

    Check for continuity in the circuits. Powertrain Control/Emissions Diagnosis Service Manual for Is there good continuity in the circuits? functional testing of the FPCM. No — Repair circuit wiring. Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 79: Pinpoint Test P: Gateway Module Electrical Test

    Refer to the Blue Bird Service Manual for circuit information. (597-6874), Opt. 2. Is there good continuity in the circuits? No — Repair circuit wiring. Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 80: Pinpoint Test Q: Fuel Level Sender (Fls) Electrical

    No — Replace electronic portion of sending unit. backprobe into pins B and C of sending unit connector and monitor for voltage. Is voltage present? Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 81: Procedure

    If instrument cluster is functioning properly, harness utilizing the Fuel Level Assembly Replacement replace the in-tank sending unit. Procedure. No — Repair wiring concern. Is there continuity? Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...
  • Page 82 Pin 30 – Flow Control Solenoid Note: The Tank Supply Solenoid cannot be actuated from the Gateway Module. 12v power and ground must be applied to the solenoid connector. Using the ROUSH Diagnostic Tool (RDT) (see next page for images on RDT actions) Step Procedure...
  • Page 83 ROUSH CleanTech Gen 4 Blue Bird Vision Propane ____________________________________________________________________________________________________________ Service and Diagnostic Manual, 6.8L Ford Engine Back to DTC List _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 84: Pinpoint Test S: Evaporative System Pinpoint Test

    EVAPCV PID to ON (100% duty cycle). Does the FTP_PID voltage value remain within 0.5V of the recorded PID voltage value within 30 seconds of closing the EVAP purge valve? _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...
  • Page 85 FTP Sensor Connector, Harness Side, SIGRTN Pin-2 For P0451, contact Blue Bird Field Service. Is the voltage between 4.5 - 5.5 V? No — Replace the evaporative purge valve and retest. _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 86: Reference Charts

    178.5 909.6 974.0 191.2 671.3 723.1 204.0 504.0 545.9 216.7 382.6 416.6 229.5 294.6 322.3 242.2 258.6 283.9 255.0 267.7 280.5 293.2 306.0 318.7 331.5 344.2 357.0 369.7 _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

  • Page 87: 2020 Diagnostic Codes

    ROUSH CleanTech Gen 4 Blue Bird Vision Propane ____________________________________________________________________________________________________________ Service and Diagnostic Manual, 6.8L Ford Engine 2020 Diagnostic Codes NOTE: For any DTCs not specific to the ROUSH CleanTech fuel system, please reference the Ford Powertrain Control/Emissions Diagnostic Service Manual. N/A and OFF Code not present...
  • Page 88 P0230 Fuel Pump Primary Circuit P025A Fuel Pump Module “A” Control Circuit/Open P025B Fuel Pump Module “A” Control Circuit Range/Performance P027B Fuel Pump Module “B” Control Circuit Range/Performance _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...
  • Page 89 Idle Control System - RPM Lower Than Expected P0507 Idle Control System - RPM Higher Than Expected P050A Cold Start Idle Control System Performance P050B Cold Start Ignition Timing Performance _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...
  • Page 90 Sensor Reference Voltage “A” Circuit Range/Performance P06A7 Sensor Reference Voltage “B” Circuit Range/Performance P06A8 Sensor Reference Voltage “C” Circuit Range/Performance P06B8 Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...
  • Page 91 Pressure Control Solenoid “A” Electrical P0750 Shift Solenoid “A” P0751 Shift Solenoid “A” Performance/Stuck Off P0752 Shift Solenoid “A” Stuck On P0753 non-MIL Shift Solenoid “A” Electrical P0754 Shift Solenoid “A” Intermittent _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...
  • Page 92 Pressure Control Solenoid “A” Control Circuit High P0973 Shift Solenoid “A” Control Circuit Low P0974 Shift Solenoid “A” Control Circuit High P0976 Shift Solenoid “B” Control Circuit Low _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...
  • Page 93 Inductive Signature Chip Communication Error P1639 Vehicle ID Block Corrupted, Not Programmed P163A Generator “B” Control Circuit P163B Generator “B” Field Terminal Circuit P163C Generator “B” Field Terminal Circuit Low _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...
  • Page 94 Barometric Pressure Sensor “A” Circuit Range/Performance P2228 Barometric Pressure Sensor “A” Circuit Low P2229 Barometric Pressure Sensor “A” Circuit High P2237 O2 Sensor Positive Current Control Circuit/Open (Bank 1 Sensor 1) _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...
  • Page 95 Shift Solenoid “F” Intermittent P2745 Intermediate Shaft Speed Sensor “B” Circuit p2746 Intermediate Shaft Speed Sensor “B” Circuit Range/Performance P2747 Intermediate Shaft Speed Sensor “B” Circuit No Signal _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...
  • Page 96 Transmission Range Sensor “B” Circuit Range/Performance P2802 Transmission Range Sensor “B” Circuit Low P2803 Transmission Range Sensor “B” Circuit High P2804 Transmission Range Sensor “B” Circuit Intermittent P2805 Transmission Range Sensor “A”/”B” Correlation _____________________________________________________________________________________________________________ 6.8L Gen 4 Blue Bird Vision Propane Service and Diagnostic Manual...

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