Jeep Liberty KJ. Manual — part 800
P1140-VACUUM RESERVOIR SOLENOID SHORT CIRCUIT
For a complete wiring diagram Refer to Section 8W
9 - 1258
ENGINE DIESEL DIAG
KJ
•
When Monitored:
With the ignition on and the ECM Vacuum Reservoir Solenoid command on.
•
Set Condition:
The ECM detects excessive current on the Vacuum Reservoir Solenoid Control circuit.
Possible Causes
INTERMITTENT CONDITION
VACUUM RESERVOIR SOLENOID
VR SOLENOID CONTROL SHORTED TO VOLTAGE
ENGINE CONTROL MODULE - INTERNAL SHORT TO VOLTAGE
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.
VR SOLENOID CONTROL SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Vacuum Reservoir Solenoid harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD
Relay connector.
Turn the ignition on.
Measure the voltage of the Vacuum Reservoir Solenoid Control circuit.
Is the voltage below 1.0 volt?
Yes
>> Go To 3
No
>> Repair the Vacuum Reservoir Solenoid Control circuit for a
short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1259
3.
VR SOLENOID
Turn the ignition off.
Disconnect the Vacuum Reservoir Solenoid harness connector.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Monitor the scan tool for ECM DTCs.
Does the scan tool display P1250 VACUUM RESERVOIR SOLENOID OPEN CIRCUIT?
Yes
>> Replace the Vacuum Reservoir Solenoid.
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).
9 - 1260
ENGINE DIESEL DIAG
KJ
P1140-VACUUM RESERVOIR SOLENOID CIRCUIT SHORT TO GROUND
For a complete wiring diagram Refer to Section 8W
KJ
ENGINE DIESEL DIAG
9 - 1261
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