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NOTE:
These instructions must be read and fully understood before
installation. If this manual is not fully understood, installation should
not be attempted.
DIGITAL REPLACEMENT FOR THE
ELECTRONIC CONTROL UNIT
INSTALLATION, TUNING, &
TROUBLESHOOTING
OPTIONAL EQUIPMENT
534-54
Closed Loop Kit for Digital Replacement ECU
534-50
Rich/Lean Indicator without O
534-51
Rich/Lean Indicator with O
534-56
Replacement Closed Loop Kit Harness
MANUAL
Sensor
2
Sensor
2
2D
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Summary of Contents for Holley Pro-Jection 2D
- Page 1 DIGITAL REPLACEMENT FOR THE ELECTRONIC CONTROL UNIT INSTALLATION, TUNING, & TROUBLESHOOTING MANUAL OPTIONAL EQUIPMENT 534-54 Closed Loop Kit for Digital Replacement ECU 534-50 Rich/Lean Indicator without O Sensor 534-51 Rich/Lean Indicator with O Sensor 534-56 Replacement Closed Loop Kit Harness NOTE: These instructions must be read and fully understood before installation.
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Page 2: Table Of Contents
TABLE OF CONTENTS: INTRODUCTION ...........................… ILLUSTRATED PARTS LIST ........................…. TOOLS / ADDITIONAL MATERIAL IS REQUIRED FOR INSTALLATION ..........….. MOUNTING THE ELECTRONIC CONTROL UNIT (ECU) ..............…. SELECTION BETWEEN SMALL BLOCK AND BIG BLOCK OPERATION ..........….. OPERATIONAL OVERVIEW OF THE DIGITAL ECU ................…. Main .............................. -
Page 3: Introduction
NOTE: Although every possible precaution was taken in the design of the digital ECU to prevent interference from radio sources, the use of solid core spark plug wires may interfere with the operation of the ECU. Holley recommends the use of either suppression or spiral wound spark plug wires, such as Holley Part #’s 50-9800, 50-9801, or 50-9804. -
Page 4: Illustrated Parts List
P/N 199R-9777-6. NOTE: All connections shown MUST be made in order for the PRO-JECTION 2D system to operate properly. Pick a suitable location on the interior of the vehicle in which the ECU can be mounted. Ensure that the mounting location allows for sufficient length of the wiring harness and clearance for connectors and that the adjustment knobs on the front of the ECU are accessible before mounting the ECU. -
Page 5: Selection Between Small Block And Big Block Operation
NOTE: Further instructions are available on the operation of the digital fuel injection system in the PRO-JECTION 2D fuel injection installation manual. SELECTION BETWEEN SMALL BLOCK / BIG BLOCK OPERATION: WARNING! If this ECU was purchased to replace an analog ECU, the pink wire previously connected to the starter must be removed from the starter and hooked up as described below. -
Page 6: Main
In addition to the information provided to the ECU by the various sensors, the user is also able to adjust the fuel delivery through the use of the five adjustment knobs on the front of the ECU. The user is able to adjust fuel delivery for Choke, Accelerator Pump, Idle, Main, and High RPM settings. -
Page 7: Choke
The setting of the mechanical idle speed is critical in the operation of the Digital ECU and is best accomplished by using a tachometer. If your vehicle is not equipped with a tachometer, Holley highly recommends one be used. To adjust, follow the instructions carefully. -
Page 8: Setting The Throttle Position Sensor (Tps)
With the parking brake set and while continuing to apply the brakes, shift the transmission back into “Park” and allow the engine speed to stabilize. Once again, shift the transmission into gear while applying the brakes and having the parking brake set. Check the engine speed to verify that the engine idles at approximately 700 rpm. -
Page 9: Tuning The Digital Ecu For Performance
Make small adjustments to the adjustment knob setting when tuning the system. NOTE: Holley recommends the use of a Rich / Lean indicator that will provide information relative to the air and fuel delivery to the engine when tuning the system. A Rich / Lean indicator with an Oxygen Sensor is available from Holley as Part #534-51 and without an Oxygen Sensor as P/N 534-50. -
Page 10: Tuning The Accel
NOTE: Many engines require a richer fuel mixture at idle. Therefore it may not be possible to maintain the fuel mixture at a stoichiometric level while maintaining the engine at a smooth idle. Adjust the idle fuel delivery that best meets your engine’s requirements. -
Page 11: Tuning The Choke
The ECU then adjusts the fuel delivery to maintain a stoichiometric fuel delivery (14.7:1 Air / Fuel Ratio). Disconnect the PRO-JECTION 2D wiring harness from the rear of the ECU by depressing the small latch on top of the harness connector and gently pulling the connector out of its socket on the ECU. -
Page 12: System Maintenance
If a decrease in system performance is noticed, a dirty or clogged fuel filter may be the cause. Holley recommends that both fuel filters (installed with the PRO-JECTION 2D system) be changed every 20,000 miles of normal operation. These filters are non-serviceable... -
Page 13: Troubleshooting And Component Testing
Experience has shown that most problems can be traced to something other then an ECU failure. If you experience any problems with your PRO-JECTION 2D fuel injection system, complete the following checklist before contacting Holley’s Technical Service Department at 1-270-781-9741. -
Page 14: Adjusting The Fuel Pressure
body. Replace injector. - Vacuum Leak - Locate vacuum leak and repair. - Water in fuel - Remove water from fuel with proper fueladditive. - Faulty oxygen sensor - Replace the oxygen sensor. Hard Starting (Cold Engine) - “CHOKE” knob adj. set too low - Increase “CHOKE”... -
Page 15: Testing The Coolant Temperature Sensor
TESTING THE COOLANT TEMPERATURE SENSOR: The coolant temperature sensor used with the PRO-JECTION 2D system is a single wire sensor. The ECU supplies a fixed voltage to the sensor. The resistance within the sensor varies with temperature and this variation in resistance is used by the ECU to determine the engine’s coolant temperature. -
Page 16: Testing The Power Relay
TESTING THE POWER RELAY: The power relay used with the PRO-JECTION 2D Fuel Injection System is a normally open type of relay. When Power is applied across the relay’s coil (terminals 85 and 86) the magnetic field generated closes the contacts between terminals 30 and 87.
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Do you have a question about the Pro-Jection 2D and is the answer not in the manual?
Questions and answers
is there any to test the pcm
To test the PCM (ECU) for a Holley Pro-Jection 2D:
1. Check all wiring connections and components to ensure they are properly installed and functioning.
2. Inspect fuses, ground connections, connectors, and wiring for issues such as open circuits, loose connections, or damage.
3. Verify power at the fuel pump by checking for voltage and ground. If correct voltage and ground are present but the pump does not operate, the ECU may need replacement.
4. Ensure all other vehicle systems are working properly before suspecting ECU failure.
Most issues are caused by components other than the ECU, so eliminate all other possible causes first.
This answer is automatically generated