Jeep Grand Cherokee WK. Manual — part 1029
P0627-FUEL PUMP RELAY CIRCUIT (CONTINUED)
7.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 712
ENGINE ELECTRICAL DIAGNOSTICS
WK
P062C-ETC LEVEL 2 MPH PERFORMANCE
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Throttle motor is powered and no vehicle speed related DTCs have matured.
•
Set Condition:
When secondary software determines that the vehicle speed is implausible for a period of time. ETC lamp will
flash.
Possible Causes
PCM NEEDS TO BE PROGRAMMED
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
PROGRAM THE POWERTRAIN CONTROL MODULE
Verify the PCM is at the latest calibration (flash level).
NOTE: An intermittent loss of power to the PCM without performing an ETC Relearn procedure may cause
this DTC to set.
Flash the Powertrain Control Module per Service Information if any updates are available.
Start the engine.
Allow the engine to reach normal operating temperature.
Operate the accelerator pedal. (do not exceed 3500 rpm)
With a scan tool, read DTCs.
NOTE: Diagnose any other DTCs that may have set with the P062C.
Does this DTC reset by itself?
Yes
>> Replace and reprogram the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Test Complete.
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 713
P0630-VIN NOT PROGRAMMED IN PCM
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
At initialization.
•
Set Condition:
The VIN has not been programmed into the PCM. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes
PROGRAMMING VIN INTO PCM
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
PROGRAMMING VIN INTO THE PCM
Ignition on, engine not running.
Using the scan tool, program VIN into the PCM.
Start the engine.
NOTE: If the engine will not start, crank the engine over for 15 seconds. Crank at least 2 times with the
ignition switch returning to the off position each time.
Allow the engine to reach normal operating temperature.
With the scan tool, read DTCs.
Does the DTC reset?
Yes
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> The VIN has been successfully programmed into the PCM. Test is complete.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
WK
P0632-ODOMETER NOT PROGRAMMED IN PCM
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition on.
•
Set Condition:
Odometer is not programed into the PCM. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes
PROGRAMMING MILEAGE INTO THE PCM
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
PROGRAMMING MILEAGE INTO THE PCM
Ignition on, engine not running.
With the scan tool, erase DTCs.
Using a scan tool, program the mileage into the PCM.
Start the engine.
Allow the engine to reach normal operating temperature.
With a scan tool, read DTCs.
Does the DTC reset?
Yes
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> The mileage has been successfully programmed into the PCM. Test is complete.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 715
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