Page 1 of 2 On Board Diagnostics 6.0L Diesel PCED 10/9/2010 http

Page 1 of 2 On Board Diagnostics 6.0L Diesel PCED 10/9/2010 http
On Board Diagnostics 6.0L Diesel PCED
Page 1 of 2
2005 PCED On Board Diagnostics 6.0L Diesel
SECTION 5: Pinpoint Tests
Procedure revision date: 10/27/2004
AQ: Injection Control Pressure Too Low — Engine Cranking
AQ: Introduction
AQ1 DIAGNOSTIC TROUBLE CODE (DTC) P2291
Note: This DTC may set after a high-pressure oil system repair or injector change. Drive the vehicle to clear air from the system after the repair and clear the
DTC.
Continuous DTC P2291 indicates that there was no ICP detected during crank (long crank time).
Possible causes:
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.
Record the freeze frame data.
Carry out the KOEO on-demand self-test to verify ICP and IPR circuit faults are not present.
Are any DTCs present?
Yes
REPAIR the DTCs before continuing. REFER to Section 4 Diagnostic
Trouble Code Descriptions.
No
GO to AQ2 .
For DTC P2291, GO to AQ2 .
AQ2 CHECK THE OIL LEVEL
Note: If the vehicle stalls after, start oil is not being supplied from the low pressure oil system.
Verify the correct oil level, quality, and viscosity.
Check base engine oil pressure. Refer to the Workshop Manual Section 303-01 Engine for specifications.
Verify steps 5 and 10 on the Hard Start/No Start Diagnostic Guide have been carried out.
Clear the DTCs.
Monitor the ICP PID while cranking the engine.
Is the ICP PID minimum voltage 0.85 volts within 5 seconds of crank?
Yes
The DTC is intermittent. GO to AQ6 .
No
GO to AQ3 .
AQ3 CHECK THE ICP SENSOR
Key OFF.
Disconnect the ICP sensor.
Does the vehicle start?
Yes
INSTALL a new ICP sensor. CLEAR the DTCs. REPEAT the self-test.
No
GO to AQ4 .
AQ4 HIGH-PRESSURE LEAKAGE TEST
Connect the ICP sensor.
Clear the ICP sensor DTCs.
Carry out the Injection Control Pressure Tests. Refer to Section 4 Hard Start/No Start Procedures.
Is a leak present?
Yes
REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.
No
GO to AQ5 .
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10/9/2010
On Board Diagnostics 6.0L Diesel PCED
Page 2 of 2
AQ5 CHECK THE IPR VALVE
Connect all hoses and the ICP sensor.
Install a new IPR valve.
Does the vehicle start?
Yes
System OK. CLEAR the DTCs. REPEAT the self-test.
No
INSTALL a new high pressure pump. CLEAR the DTCs. REPEAT the selftest.
AQ6 CHECK FOR INTERMITTENT CIRCUIT FAULTS
Key ON, engine OFF.
Access the ICP PID.
Grasp the vehicle harness near the ICP sensor connector. Wiggle and shake the vehicle harness while working toward the PCM.
Does the ICP PID reading fluctuate?
Yes
REPAIR the circuit as necessary. CLEAR the DTCs. REPEAT the self-test.
No
GO to AQ7 .
AQ7 INSPECT THE IPR CIRCUIT
Inspect the IPR circuit from the IPR valve through the 12-way connector to the PCM.
Are any concerns present?
Yes
REPAIR the circuit as necessary. CLEAR the DTCs. REPEAT the self-test.
No
UNABLE to duplicate the condition. CHECK for a loose connection, and
damaged or corroded terminals. WIGGLE the harness attempting to
recreate the fault. REPAIR as necessary. REFER to Section 3 if a
driveability concern exists.
http://www.fordtechservice.dealerconnection.com/pubs/content/~WV5C/~MUS~LEN/15/...
10/9/2010
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