Jeep Liberty KJ. Manual — part 801
•
When Monitored:
With the ignition on and the ECM Vacuum Reservoir Solenoid command off.
•
Set Condition:
The ECM detects a short to ground 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).
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ENGINE DIESEL DIAG
KJ
3.
VACUUM RESERVOIR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the Vacuum Reservoir Solenoid harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Vacuum Reservoir
Solenoid Control circuit.
Is the resistance above 1000 ohms?
Yes
>> Go To 4
No
>> Repair the Vacuum Reservoir Solenoid Control circuit for a
short to ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
4.
VACUUM RESERVOIR SOLENOID CONTROL CIRCUIT OPEN
Turn the ignition off.
Disconnect the Vacuum Reservoir Solenoid harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Vacuum Reservoir Solenoid Control cir-
cuit.
Is the resistance below 10.0 ohms?
Yes
>> Go To 5
No
>> Repair the Vacuum reservoir Solenoid Control circuit for an
open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
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ENGINE DIESEL DIAG
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5.
VACUUM RESERVOIR SOLENOID
Turn the ignition off.
Install a substitute Vacuum Reservoir Solenoid in place of the vehicle’s Vacuum Reservoir Solenoid.
NOTE: Ensure the ECM and Vacuum Reservoir Solenoid harness connectors are connected.
Turn the ignition on.
With the scan tool, check for this DTC to set again.
Did this DTC set again?
Yes
>> 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).
No
>> Replace the Vacuum Reservoir Solenoid.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
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ENGINE DIESEL DIAG
KJ
P1142-FUEL PRESSURE SOLENOID OPEN CIRCUIT
For a complete wiring diagram Refer to Section 8W
KJ
ENGINE DIESEL DIAG
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