Jeep Grand Cherokee WK. Manual — part 1000
P0532-A/C PRESSURE SENSOR CIRCUIT LOW (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Engine running, AC is learned, and AC Clutch Relay energized.
•
Set Condition:
The A/C pressure transducer signal voltage at the PCM goes below 0.58 of a volt for 2.6 seconds. One Trip
Fault. Three good trips to turn off the MIL.
Possible Causes
(F891) 5-VOLT SUPPLY CIRCUIT OPEN
(F891) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
A/C PRESSURE TRANSDUCER
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (C918) SENSOR RETURN CIRCUIT
FRONT CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
A/C PRESSURE TRANSDUCER VOLTAGE BELOW 0.6 OF A VOLT
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 below 0.6 of a volt?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
(F891) 5-VOLT SUPPLY CIRCUIT
Turn the ignition off.
Disconnect the A/C Pressure Transducer harness connector.
Ignition on, engine not running.
Measure the voltage on the (F891) 5-volt Supply circuit in the A/C
Pressure Transducer harness connector.
Is the voltage between 4.5 to 5.2 volts?
Yes
>> Go To 3
No
>> Go To 6
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ENGINE ELECTRICAL DIAGNOSTICS
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P0532-A/C PRESSURE SENSOR CIRCUIT LOW (CONTINUED)
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 C1 FCM 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 Sig-
nal 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 (C918) SENSOR RETURN CIRCUIT
Disconnect the IPM FCM harness connector.
Measure the resistance between the (C18) A/C Pressure Signal circuit
and the (C918) Sensor Return circuit in the A/C Pressure Transducer
harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (C918) Sensor Return 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
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P0532-A/C PRESSURE SENSOR CIRCUIT LOW (CONTINUED)
6.
(F891) 5-VOLT SUPPLY CIRCUIT OPEN
Turn the ignition off.
Disconnect the C1 FCM harness connector.
Measure the resistance of the (F891) 5-volt Supply circuit from the A/C
Pressure Transducer harness connector to the C1 FCM harness con-
nector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (F891) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
7.
(F891) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (F891) 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 (F891) 5-volt Supply cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
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ENGINE ELECTRICAL DIAGNOSTICS
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P0532-A/C PRESSURE SENSOR CIRCUIT LOW (CONTINUED)
8.
FRONT CONTROL MODULE
NOTE: Before continuing, check the FCM 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 BODY VERIFICATION TEST-VER 1.
No
>> Replace and program the Front Control Module per Service Information.
Perform BODY VERIFICATION TEST-VER 1.
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 599
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