Jeep Liberty KJ. Manual — part 747
6.
A/C SENSOR SIGNAL CKT OPEN
Turn the ignition off.
Disconnect the BCM harness connectors.
Disconnect the A/C Pressure Sensor harness connector.
Measure the resistance of the A/C Pressure Sensor Signal circuit.
Is the resistance below 10.0 ohms?
Yes
>> Go To 7
No
>> Repair the A/C Pressure Sensor Signal circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
7.
A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the BCM harness connectors.
Disconnect the A/C Pressure Sensor harness connector.
Measure the resistance between ground and the A/C Pressure Sensor
Signal circuit.
Is the resistance above 1000 ohms?
Yes
>> Go To 8
No
>> Repair the A/C Pressure Sensor Signal circuit for a short to
ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
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ENGINE DIESEL DIAG
KJ
8.
A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
Turn the ignition off.
Disconnect the BCM harness connectors.
Disconnect the A/C Pressure Sensor harness connector.
Measure the resistance between Sensor Ground and the A/C Pressure
Sensor Signal circuit.
Is the resistance above 1000 ohms?
Yes
>> Replace and program the body Control Module in accor-
dance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the A/C Pressure Sensor Signal circuit for a short to
the Sensor Ground circuit.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1047
P0560-ECM VOLTAGE TOO HIGH
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on or the engine running.
•
Set Condition:
Possible Causes
CHECKING ECM POWER AND GROUNDS
ECM
INTERMITTENT CONDITION
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.
NOTE: This DTC may be caused by a charging system problem. Refer to the Service Information and verify
proper charging system operation before continuing.
Test drive the vehicle.
Turn the ignition on.
With the scan tool, read 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.
CHECK POWER AND GROUNDS
Refer to the symptom list and perform the Checking the ECM Power and Ground test.
Were any problem found with the ECM powers and grounds?
Yes
>> Repair as necessary.
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 - 1048
ENGINE DIESEL DIAG
KJ
P0560-ECM VOLTAGE TOO LOW
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on or the engine running.
•
Set Condition:
Possible Causes
CHECKING ECM POWER AND GROUNDS
ECM
INTERMITTENT CONDITION
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.
NOTE: This DTC may be caused by a charging system problem. Refer to the Service Information and verify
proper charging system operation before continuing.
Test drive the vehicle.
Turn the ignition on.
With the scan tool, read 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.
CHECK POWER AND GROUNDS
Refer to the symptom list and perform the Checking the ECM Power and Ground test.
Were any problem found with the ECM powers and grounds?
Yes
>> Repair as necessary.
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
9 - 1049
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