Jeep Liberty KJ. Manual — part 605
•
When Monitored:
With the ignition on. Battery voltage greater than 10.4 volts and the ASD sense switch is on.
•
Set Condition:
Actual Fuel Pump Relay state is not equal to desired state. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes
(F1) FUSED IGNITION SWITCH OUTPUT CIRCUIT
INTERNAL FUSED B+ CIRCUIT
(K31) FUEL PUMP RELAY CONTROL CIRCUIT
(K31) FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO GROUND
FUEL PUMP RELAY
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
FUEL PUMP RELAY OPERATION
Ignition on, engine not running.
With a scan tool, actuate the Fuel Pump Relay.
Is the Fuel Pump Relay operating?
Yes
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 2
2.
FUEL PUMP RELAY
Turn the ignition off.
Remove the Fuel Pump Relay from the IPM.
Measure the resistance of the Fuel Pump Relay Coil.
Is the resistance between 70 to 90 ohms?
Yes
>> Go To 3
No
>> Replace the Fuel Pump Relay.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
3.
FUSED B+ CIRCUIT
Using a 12-volt test light connected to ground, probe the Fused B+ cir-
cuit.
Does the test light illuminate brightly?
Yes
>> Go To 4
No
>> Repair the open or short to ground in the Fused B+ circuit.
Inspect the related fuse and repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
4.
(F1) FUSED IGNITION SWITCH OUTPUT CIRCUIT
Ignition on, engine not running.
Using a 12-volt test light connected to ground, probe the (F1) Fused
Ignition Switch Output circuit.
Does the test light illuminate brightly?
Yes
>> Go To 5
No
>> Repair the open or short to ground in the (F1) Fused Igni-
tion Switch Output circuit. Inspect the related fuse and
repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 479
5.
(K31) FUEL PUMP CONTROL CIRCUIT OPEN
Turn the ignition off.
Disconnect the C3 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.
Measure the resistance of the (K31) Fuel Pump Relay Control circuit
from the PDC to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Repair the open in the (K31) Fuel Pump Relay Control cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
6.
(K31) FUEL PUMP CONTROL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (K31) Fuel Pump
Relay Control circuit in the PDC.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K31) Fuel Pump Relay
Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
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)
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
P0630-VIN NOT PROGRAMMED IN PCM
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
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