Jeep Liberty KJ. Manual - part 819
•
When Monitored:
With the ignition on and the ECM Vacuum Reservoir Solenoid command on.
•
Set Condition:
The ECM detects a short to voltage on the Vacuum Reservoir Solenoid Control circuit.
Possible Causes
INTERMITTENT CONDITION
ASD RELAY OUTPUT CIRCUIT OPEN
VACUUM RESERVOIR SOLENOID CONTROL SHORTED TO VOLTAGE
VACUUM RESERVOIR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
VACUUM RESERVOIR SOLENOID CONTROL CIRCUIT OPEN
VACUUM RESERVOIR SOLENOID
ENGINE CONTROL MODULE
Diagnostic Test
1.
CHECK FOR ACTIVE DTC
NOTE: IfINTERMITTENT CONDITIONe ECM detects and stores a DTC, the ECM also stores the engine/vehi-
cle 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.
Perform several ignition cycles, turning the ignition off for at least 10 seconds between each ignition cycle.
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.
CHECKING FOR OTHER DTCS
NOTE: An open ASD power supply to the ECM will cause multiple DTC’s including this DTC to set.
NOTE: Check the ECM for other DTC’s. If other DTC’s are set with this DTC refer to the symptom list and
perform the CHECKING THE ECM POWER AND GROUND CIRCUITS test before continuing.
If the ECM power and ground circuits are functioning properly continue with this test.
Yes
>> Go To 3
9 - 1334
ENGINE DIESEL DIAG
KJ