P0532-A/C PRESSURE SENSOR CIRCUIT LOW

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

(C818) 5-VOLT SUPPLY CIRCUIT OPEN

(C818) 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) A/C PRESSURE TRANSDUCER GROUND CIRCUIT

PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

1.A/C PRESSURE TRANSDUCER VOLTAGE BELOW 0.6 OF A VOLT

NOTE: Diagnose any CAN - C Communication DTCs before continuing.

NOTE: Make sure the A/C refrigerant System is properly charged per Service Information.

Is the voltage below 0.6 of a volt?

Yes

Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

2.(C818) 5-VOLT SUPPLY CIRCUIT

Is the voltage between 4.5 to 5.2 volts?

Yes

3.A/C PRESSURE TRANSDUCER

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)

4.(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND

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)

5.(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (C918) SENSOR GROUND CIRCUIT

Is the resistance below 100 ohms?

Yes

Repair the short between the (C918) Sensor Ground circuit and the (C18) A/C Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

6.(C818) 5-VOLT SUPPLY CIRCUIT OPEN

Is the resistance below 5.0 ohms?

Yes

Repair the open in the (C818) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

7.(C818) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Is the resistance below 100 ohms?

Yes

Repair the short to ground in the (C818) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

8.PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Were there any problems found?

Yes

Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)