Jeep Liberty KJ. Manual — part 614
P1607-PCM INTERNAL SHUTDOWN TIMER RATIONALITY
For a complete wiring diagram Refer to Section 8W.
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
Ignition on and battery voltage greater than 10 volts.
•
Set Condition:
Internal PCM failure detected. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes
(F1) AND (F26) PCM FUSED IGNITION SWITCH CIRCUIT
PCM INTERNAL
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
PCM IGNITION CIRCUITS
Turn the ignition off.
Disconnect the C1 PCM harness connector.
CAUTION: Do not probe the PCM harness connectors. Probing the
PCM harness connectors will damage the PCM terminals resulting
in poor terminal to pin connection. Install Miller Special Tool #8815
to perform diagnosis.
With a 12-volt test light connected to ground and with special tool
#8815 installed, probe the (F1) and (F26) Fused Ignition Switch circuits.
Perform the above check with the Ignition key in the off lock position,
Ignition on, engine not running position, and during cranking.
Wiggle the related wire harness while probing the special tool with the
test light to try to interrupt the circuit.
Does the test light illuminate brightly?
Yes
>> Go To 2
No
>> Repair the open or excessive resistance in the (F1) and
(F26) Fused Ignition Switch (Off, Run, Start) circuits.
Inspect the related fuse, if the fuse is open check the cir-
cuits for a short to ground.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
PCM
The Powertrain Control Module is reporting internal errors.
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)
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ENGINE ELECTRICAL DIAGNOSTICS
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P1696-EEPROM MEMORY WRITE DENIED/INVALID
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Continuously with the ignition on.
•
Set Condition:
An attempt to program/write to the internal EEPROM failed, Also checks at powerdown. One Trip Fault. Three
good trips to turn off the MIL.
Possible Causes
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
SCAN TOOL DISPLAYS A WRITE FAILURE
With a scan tool, perform the SRI Memory Test.
Does scan tool display Write Failure?
Yes
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 2
2.
SCAN TOOL DISPLAYS A WRITE REFUSED
With the a scan tool, perform the SRI Memory Test.
Does the scan tool display Write Refused?
Yes
>> Go To 3
No
>> Go To 4
3.
PCM REFUSED 2ND TEST
With a scan tool, perform the SRI Memory Test a third time.
NOTE: Retest the SRI Memory two more times.
Does the scan tool display Write Refused again?
Yes
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Test Complete.
4.
SCAN TOOL DISPLAYS SRI MILEAGE INVALID
With a scan tool, perform the SRI Memory Test.
Does the scan tool display SRI Mileage Invalid?
Yes
>> Update the mileage and retest the SRI Memory.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
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ENGINE ELECTRICAL DIAGNOSTICS
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5.
COMPARE SRI MILEAGE WITH ODOMETER
Compare the SRI Mileage stored with the Instrument Panel Odometer.
Is the mileage within the specified range displayed on the scan tool?
Yes
>> Test Complete.
No
>> Update the mileage and retest the SRI Memory.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
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