Jeep Liberty KJ. Manual — part 592
3.
A/C PRESSURE TRANSDUCER
With the scan tool, monitor the A/C Pressure Transducer voltage.
Is the voltage above 0.6 of a volt?
Yes
>> Replace the A/C Pressure Transducer.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C2 BCM harness connector.
Measure the resistance between ground and the (C18) A/C Pressure
Signal circuit in the A/C Pressure Transducer harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (C18) A/C Pressure Signal
circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
5.
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K310) SENSOR GROUND CIRCUIT
Measure the resistance between the (C18) A/C Pressure Signal circuit
and the (K310) Sensor ground circuit in the A/C Pressure Transducer
harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (K310) Sensor ground circuit
and the (C18) A/C Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
6.
(K301) 5-VOLT SUPPLY CIRCUIT OPEN
Turn the ignition off.
Disconnect the C2 BCM harness connector.
Measure the resistance of the (K301) 5-volt Supply circuit from the A/C Pressure Transducer harness connector to
the C2 BCM harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (K301) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
7.
(K301) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (K301) 5-volt Supply
circuit in the A/C Pressure Transducer harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K301) 5-volt Supply cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
8.
BCM
NOTE: Before continuing, check the BCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MOD-
ULES - STANDARD PROCEDURE)
No
>> Replace and program the Body Control Module per Service Information.
Perform the BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MOD-
ULES - STANDARD PROCEDURE)
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 427
P0533-A/C PRESSURE SENSOR CIRCUIT HIGH (ESP)
For a complete wiring diagram Refer to Section 8W.
9 - 428
ENGINE ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
Engine running and the AC Clutch Relay energized.
•
Set Condition:
The A/C pressure transducer signal at the PCM goes above 4.92 volts for more than 2.6 seconds. One trip
Fault. Three good trips to turn off the MIL.
Possible Causes
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(C18) A/C PRESSURE SIGNAL CIRCUIT OPEN
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K301) 5-VOLT SUPPLY CIRCUIT
(K310) SENSOR GROUND CIRCUIT OPEN
A/C PRESSURE TRANSDUCER
CAN C BUS CIRCUIT OPEN OR SHORTED
BCM
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
A/C PRESSURE TRANSDUCER VOLTAGE ABOVE 4.9 VOLTS
NOTE: Diagnose any CAN C Bus Communication DTCs before continuing.
NOTE: Make sure the A/C refrigerant System is properly charged per Service Information.
Start the engine.
With a scan tool, read the A/C Pressure Sensor voltage.
Is the voltage above 4.9 volts?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
A/C PRESSURE TRANSDUCER
Turn the ignition off.
Disconnect the A/C Pressure Transducer harness connector.
Connect a jumper wire between the (C18) A/C Pressure Signal circuit
and the (K310) Sensor ground circuit in the Transducer harness con-
nector.
Ignition on, engine not running.
With the scan tool, monitor the A/C Pressure Transducer voltage.
Is the voltage below 1.0 volt with the jumper wire installed?
Yes
>> Replace the A/C Pressure Transducer.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
NOTE: Remove the jumper wire before continuing.
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 429
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