Jeep Liberty KJ. Manual — part 746
P0530- A/C PRESS SENSOR CIRCUIT VOLTAGE TOO HIGH
For a complete wiring diagram Refer to Section 8W
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ENGINE DIESEL DIAG
KJ
•
When Monitored:
With the ignition on.
•
Set Condition:
The A/C Pressure Sensor Signal is above 4.74 volts for 0.6 second.
Possible Causes
5-VOLT SUPPLY CIRCUIT OPEN
BCM - A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
BCM - A/C PRESSURE SENSOR SIGNAL SHORT TO GROUND
A/C PRESSURE SENSOR FAILURE
A/C PRESSURE SENSOR SIGNAL CIRCUIT OPEN
A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
SENSOR GROUND CIRCUIT OPEN
INTERMITTENT CONDITION
Diagnostic Test
1.
CHECKING FOR CURRENT DTC
NOTE: If DTC P0641 or P0651 is present with this DTC, diagnose DTCs P0641 and P0651 before diagnosing
this 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, letting the engine run for at least 30 seconds at a time.
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)
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ENGINE DIESEL DIAG
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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).
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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 - 1045
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