Jeep Liberty KJ. Manual — part 745
2.
CHECKING A/C SENSOR SIGNAL CKT
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage of the A/C Pressure Sensor Signal circuit.
Select the appropriate voltage reading.
Voltage is above 5.5 volts.
Go To 3
Voltage is between 4.7 and 5.4 volts.
Go To 4
Voltage is below 4.7 volts.
Go To 6
3.
A/C SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the BCM 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 A/C Pressure Sensor Signal circuit.
Is the voltage below 1.0 volt?
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
voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
9 - 1038
ENGINE DIESEL DIAG
KJ
4.
5-VOLT SUPPLY CIRCUIT OPEN
Turn the ignition off.
Disconnect the BCM harness connectors.
Disconnect the A/C Pressure Sensor harness connector.
Measure the resistance of the 5-Volt Supply circuit between the BCM
harness connector and the A/C Pressure Sensor harness connector.
Is the resistance below 10.0 ohms?
Yes
>> Go To 5
No
>> Repair the 5-Volt Supply circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
5.
SENSOR GROUND CKT OPEN
Turn the ignition off.
Disconnect the BCM harness connectors.
Disconnect the A/C Pressure Sensor harness connector.
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 10.0 ohms?
Yes
>> Replace the A/C Pressure Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the Sensor Ground circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1039
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).
9 - 1040
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 - 1041
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