Tests Procedure

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P1 PRELIMINARY DIAGNOSIS

Carry out a visual inspection.
Retrieve and record any continuous and on-demand DTCs.
Record the freeze frame data.
Clear the DTCs.
Carry out the INJECTOR ELECTRICAL SELF-TEST (CLICK TEST) . Refer to .

Are any DTCs retrieved?

Yes	No
For DTCs P0261, P0264, P0267, P0270, P0273, P0276, P0279, or P0282, GO to P2. For DTCs P0262, P0265, P0268, P0271, P0274, P0277, P0280, or P0283, GO to P4. For DTCs P0301, P0302, P0303, P0304, P0305, P0306, P0307, or P0308, GO to P7. For DTCs P0263, P0266, P0269, P0272, P0275, P0278, P0281, or P0284, GO to P15.	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 SYMPTOM CHARTS - 6.0L DIESEL if a driveability concern exists.

P2 DIAGNOSTIC TROUBLE CODES (DTCs) P0261, P0264, P0267, P0270, P0273, P0276, P0279, OR P0282

Possible causes:
- open circuit
- coil to coil short
- fuel injector
- FICM connector loose
- FICM
Key OFF.
Disconnect the suspect fuel injector.
Visually inspect the suspect injector pins.
Measure the resistance between the suspect fuel injector pins, component side as follows:
- Pins 1 and 2 - 0.2 to 3.0 ohms
- Pins 3 and 4 - 0.2 to 3.0 ohms
- Pins 1 and 3 - greater than 10,000 ohms
- Pins 1 and 4 - greater than 10,000 ohms
- Pins 2 and 3 - greater than 10,000 ohms
- Pins 2 and 4 - greater than 10,000 ohms

Are the resistances within specifications?

Yes	No
GO to P3.	INSTALL a new fuel injector in question. CLEAR the DTCs. REPEAT the self-test.

P3 CHECK THE FUEL INJECTOR CIRCUITS FOR AN OPEN

Disconnect the FICM.
Measure the resistance between the suspect fuel injector pins 1, 2, 3, and 4, harness side and the FICM connector pins, harness side.

Are the resistances less than 5 ohms?

Yes	No
INSTALL a new FICM.	REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

P4 DIAGNOSTIC TROUBLE CODES (DTCs) P0262, P0265, P0268, P0271, P0274, P0277, P0280, OR P0283

Possible causes:
- circuit short to voltage
- circuit short to ground
- fuel injector
- FICM
Key OFF.
Disconnect the suspect fuel injector to simulate the opposite DTC.
Carry out the Injector Electrical Self-Test.

Is DTC P0261, P0264, P0267, P0270, P0273, P0276, P0279, or P0282 indicated?

Yes	No
GO to P2.	GO to P5.

P5 CHECK THE FUEL INJECTOR CIRCUITS FOR A SHORT TO GROUND

Key OFF.
Disconnect the FICM.
Measure the resistance between the suspect injector pins 1, 2, 3, and 4, harness side and ground.

Are the resistances greater than 10,000 ohms?

Yes	No
GO to P6.	REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

P6 CHECK THE FUEL INJECTOR CIRCUITS FOR A SHORT TO VOLTAGE

Key ON, engine OFF.
Measure the voltage between the suspect injector pins 1, 2, 3, and 4, harness side and ground.

Is any voltage indicated?

Yes	No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.	INSTALL a new FICM. CLEAR the DTCs. REPEAT the self-test.

P7 CHECK FOR CONTINUOUS MEMORY FAULT DTCs

Check for continuous memory DTCs.

Are DTCs P0301, P0302, P0303, P0304, P0305, P0306, P0307, or P0308 present?

Yes	No
INSPECT the valve train, pistons, and for other base engine concerns. REPAIR as necessary. REFER to ENGINE . If OK, REFER to PERFORMANCE DIAGNOSTIC PROCEDURES to continue diagnosis.	GO to P8

P8 CARRY OUT THE KOEO SELF-TEST AND THE INJECTOR ELECTRICAL SELF-TEST

Carry out the KOEO and Injector Electrical self-tests.

Are any DTCs present?

Yes	No
REFER to DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTIONS .	GO to P9.

P9 CHECK FOR KOER DTCS

Carry out the KOER self-test.

Are any DTCs present?

Yes	No
REFER to DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTIONS .	GO to P10.

P10 CHECK THE FUEL SUPPLY PRESSURE

Check the fuel system pressure. Refer to DIAGNOSTIC SUBROUTINES - 6.0L DIESEL .

Is the fuel pressure within specification?

Yes	No
GO to P11.	REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.

P11 CHECK FOR FUEL AERATION

Carry out the FUEL AERATION TEST .

Is the fuel aerated?

Yes	No
REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.	GO to P12.

P12 CHECK FOR OIL AERATION

Carry out the Oil Aeration Test. Refer to DIAGNOSTIC SUBROUTINES - 6.0L DIESEL .

Is the oil aerated?

Yes	No
CHANGE the oil. REPEAT the Oil Aeration Test. If oil aeration is present again, REFER to ENGINE .	GO to P13.

P13 CARRY OUT THE INJECTOR ENHANCED DIAGNOSTICS

Carry out INJECTOR INTERRUPT FOR ENHANCED DIAGNOSTICS . Refer to .

Is a weak cylinder identified?

Yes	No
If all 4 cylinders on one bank are identified, CHECK the following: Oil rail check valve for restriction Fuel inlet check valve FICM Compression/head gaskets Fuel contamination If multiple or individual cylinders are identified, CHECK the dual mass flywheel. If individual cylinders are identified, CHECK the following: Wiring to the injector Injector hold-down bolt Injector copper gasket presence Faulty injector If the 2 rear cylinders are identified on either bank as weak, CHECK the following: AWA fitting in the oil rail Compression/head gasket Any individual cylinder concern can be seen in the conditions listed above. If any two adjacent cylinders are identified as weak, CHECK the compression/head gasket.	GO to P14.

Yes

If all 4 cylinders on one bank are identified, CHECK the following:

Oil rail check valve for restriction
Fuel inlet check valve
FICM
Compression/head gaskets
Fuel contamination

If multiple or individual cylinders are identified, CHECK the dual mass flywheel.
If individual cylinders are identified, CHECK the following:

Wiring to the injector
Injector hold-down bolt
Injector copper gasket presence
Faulty injector

If the 2 rear cylinders are identified on either bank as weak, CHECK the following:

AWA fitting in the oil rail
Compression/head gasket

Any individual cylinder concern can be seen in the conditions listed above.
If any two adjacent cylinders are identified as weak, CHECK the compression/head gasket.

GO to P14.

P14 CHECK THE CRANKCASE PRESSURE

Carry out the CRANKCASE PRESSURE TEST .

Is the crankcase pressure greater than specification?

Yes	No
REPAIR as necessary. REFER to ENGINE .	INSTALL a new PCM. CLEAR the DTCs. REPEAT the self-test.

P15 DTCs P0263, P0266, P0269, P0272, P0275, P0278, P0281, OR P0284: CHECK THE FUEL SYSTEM PRESSURE

Check the fuel system pressure. Refer to ELECTRIC FUEL PUMP PRESSURE .

Is the fuel pressure within specification?

Yes	No
GO to P16.	REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.

P16 CRANKCASE AND COMPRESSION TESTS

Carry out the CRANKCASE PRESSURE TEST .
Carry out a cylinder compression test on the suspect cylinder.

Are any concerns present?

Yes	No
REPAIR as necessary. REFER to ENGINE .	GO to P17.

P17 CARRY OUT A VISUAL INSPECTION

Carry out a visual inspection for the following mechanical concerns:
- pushrods
- rocker arms
- valves
- valve springs

Are any concerns present?

Yes	No
REPAIR as necessary. REFER to ENGINE .	INSPECT the fuel injector and O-rings. If the fuel injector and O-rings are OK, INSTALL a new fuel injector. CLEAR the DTCs. REPEAT the self-test.