Jeep Liberty KJ. Manual — part 869
5.
FUEL PRESSURE SOLENOID CIRCUIT(S) SHORTED TOGETHER
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Fuel Pressure Solenoid harness connector.
Measure the resistance between the Fuel Pressure Solenoid circuits.
Is the resistance above 1000 ohms?
Yes
>> Go To 6
No
>> Repair the Fuel Pressure Solenoid circuits for a short
together.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
6.
FUEL PRESSURE SOLENOID CIRCUIT(S) SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Fuel Pressure Solenoid harness connector.
Remove the ASD Relay.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD
Relay connector.
Turn the ignition on.
Measure the voltage each of the Fuel Pressure Solenoid circuits.
Is the voltage below 1.0 volt for each measurement?
Yes
>> Go To 7
No
>> Repair the circuit(s) that measured above 1.0 volts for a
short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
7.
FUEL PRESSURE SOLENOID
Turn the ignition off.
Remove the jumper wire from the ASD relay connector.
Reinstall the ASD relay.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Monitor the scan tool for ECM DTCs.
NOTE: The scan tool should display P2294-FUEL PRESSURE SOLENOID OPEN CIRCUIT.
Turn the ignition off.
Connect a jumper wire between cavity 1 and cavity 2 of the Fuel Pressure Solenoid harness connector.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Monitor the scan tool for ECM DTCs.
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ENGINE DIESEL DIAG
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NOTE: The scan tool should display P2296-FUEL PRESSURE SOLENOID SHORT CIRCUIT.
Does the scan tool display the appropriate DTC for each condition?
Yes
>> Replace the Fuel Pressure Solenoid in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
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P2525-VACUUM RESERVOIR SOLENOID OPEN CIRCUIT
For a complete wiring diagram Refer to Section 8W
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ENGINE DIESEL DIAG
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•
When Monitored:
With the ignition on and the ECM Vacuum Reservoir Solenoid command off.
•
Set Condition:
The ECM does not detect voltage on the Vacuum Reservoir Solenoid Control circuit.
Possible Causes
INTERMITTENT CONDITION
ASD RELAY OUTPUT CIRCUIT OPEN
VR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
VR SOLENOID CONTROL CIRCUIT OPEN
VACUUM RESERVOIR SOLENOID
ENGINE CONTROL MODULE
Diagnostic Test
1.
CHECK FOR ACTIVE DTC
NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions
under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the
DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may
assist when checking for an active DTC.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Start the engine several times, turning the ignition off for at least 10 seconds between engine run cycles.
Monitor the scan tool for ECM DTCs.
Did this DTC set again?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
ASD OUTPUT CKT OPEN
Turn the ignition off.
Disconnect the Vacuum Reservoir Solenoid harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ASD Relay
Output circuit at the Vacuum Reservoir Solenoid harness connector.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the ASD Relay Output circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
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