Test AQ: Injector Control Pressure Too Low - Engine Cranking: Testing

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: The Powertrain Control Module (PCM) harness connectors must be properly seated and the connector latch properly attached to eliminate possible driveability concerns or a no-start condition. Installing PCM connectors on an angle may cause a bad connection, misdiagnosis and damaged components. Install the connector on where the lever pivots and seats itself. Apply light pressure to get the connector into position on the PCM lever to fully seat the connector.

NOTE: When the PCM engine harness connector is disconnected additional DTCs will be set. All DTCs must be cleared before returning the vehicle to service.

NOTE: This DTC may set after a high-pressure oil system repair (i.e., injector change). Drive the vehicle to clear air from the system after repair and clear the DTC.

1) DTC P2291

Continuous DTC P2291 indicates that there was no ICP detected during crank (long crank time). Possible causes are:
- High-pressure oil system repair.
- Empty/low oil reservoir at crank.
- Low engine oil level or incorrect viscosity.
- IPR circuit fault.
- Low-pressure oil pump.
- IPR valve.
- ICP sensor.
- High-pressure oil pump.
Check the engine oil level. Perform the KOER ON-DEMAND SELF-TEST under QUICK TEST to verify ICP and IPR circuit faults are not present. Are any DTCs present? If yes, REPAIR the DTCs before continuing. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If DTC P2291 returns, go to next step. If no, go to next step.

NOTE: If the vehicle stalls after start oil is not being supplied from the low pressure oil system.

2) Check The Oil Level
Verify correct oil level, quality and viscosity. Check base engine oil pressure. Oil pressure should be more than 10 psi (69 kPa) at 230°F (110°C). Clear the DTCs. Using scan tool, monitor the ICP PID while cranking the engine. Is the ICP PID minimum voltage 0.85 volts within 5 seconds of crank? If yes, the DTC is intermittent. Go to step 6). If no, go to next step.

3) Check The ICP Sensor

Disconnect the ICP sensor. Does the vehicle start? If yes, install a new ICP sensor. If no, go to next step.

4) High-Pressure Leakage Test

Connect the ICP sensor. Clear the ICP sensor DTCs. Perform the INJECTION CONTROL PRESSURE LEAK TEST under HARD START/NO-START DIAGNOSTIC PROCEDURES in SYSTEM & COMPONENT TESTING - 6.0L DIESEL article. Is a leak fault indicated? If yes, repair as necessary. If no, go to next step.

5) IPR Valve Check

Connect all hoses and the ICP sensor. Install a new IPR valve. Does the vehicle start? If yes, system is okay. If no, install a new high pressure pump.

6) Check For Intermittent Circuit Faults

Key on, engine off. Using scan tool, access the ICP PID. Grasp the vehicle harness near the ICP sensor connector. Wiggle and shake vehicle harness while working toward the PCM. Does the ICP PID reading fluctuate? If yes, repair the circuit as necessary. If no, go to next step.

7) Inspect The IPR Circuit

Inspect the IPR circuit from the IPR valve through the 12-way connector to the PCM. Are any faults indicated? If yes, repair the circuit as necessary. If no, unable to verify concern at this time.