Navistar International DT 466 Diagnostic/Troubleshooting Manual page 265

Figure 344 Road Performance. ssn
5. Open D_RoadPerformance.ssn to monitor engine
operation.
6. Verify that the following are listed in the session
and snapshot setup:
• Engine Speed (rpm)
• Engine Load (EL %)
• Boost Pres (MAP)
• Inject Ctrl Pres (ICP)
• Brake Ctrl Pres (BCP) – if equipped
• Fuel Delivery Pres (EFP) – if equipped
7. Drive vehicle and make sure engine operating
temperature reaches 70 °C (158 °F) or higher.
8. Find a long, open stretch of road. When driving
conditions are safe, select a suitable gear, press
accelerator pedal fully to the floor, and accelerate
to rated speed at 100% load. Start the snapshot
and, if a gauge is being used, monitor fuel
pressure.
9. After the test is complete, park the vehicle. Replay
the snapshot by selecting the following:
• Engine Speed (rpm)
• Engine Load (EL %)
• Boost Pres (MAP)
• Inject Ctrl Pres (ICP)
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
6 PERFORMANCE DIAGNOSTICS
10. Record results on Diagnostic Form.
11. Review the results of boost pressure.
12. Review the results of fuel pressure.
13. Review the results of Inject Ctrl Pres (ICP).
14. Review the results of Brake Ctrl Pres (BCP).
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
• Brake Ctrl Pres (BCP) – if equipped
• Fuel Delivery Pres (EFP) – if equipped
• If boost pressure is in specification, vehicle
does not have a Performance Diagnostics
problem at this time.
symptoms should
customer.
• If boost pressure is not to specification,
continue to step 12.
• If fuel pressure is in specification, continue
with step 13.
• If fuel pressure is below specification, replace
the filter, clean the strainer, and test again.
• If fuel pressure is still low after replacing fuel
filter and cleaning the strainer, continue to
"Fuel Inlet Restriction."
• If the injection control pressure is in
specification, do not continue with ICP system
diagnostics.
• If the injection control pressure is not in
specification, and is equipped with optional
engine brake, continue to step 14.
• If the injection control pressure is not in
specification, and is not equipped with
optional engine brake, continue to step 15.
NOTE: BCP should be reading 0 kPa (0 psi).
Values can fluctuate as high as 345 kPa (50 psi).
Electromagnetic Interference (EMI) or ground
shift can cause an insignificant voltage shift that
does not indicate a problem.
• If BCP is in specification, continue to step 15.
• If BCP is not zero when engine brake is
inactive, diagnose the BCP sensor, circuit,
and engine brake components.
261
The issue and
be discussed with