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P0532






P0532-A/C PRESSURE SENSOR CIRCUIT LOW







- When Monitored:
With the ignition on and battery voltage greater than 10.4 volts.

- Set Condition:
The PCM detects that the A/C Pressure Transducer input voltage is below the minimum acceptable value.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. DTC IS ACTIVE
1. Start the engine and allow it to reach normal operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.

2. With the scan tool, select View DTCs.

Is the DTC Active at this time?

Yes

- Go To 2

No

- Refer to the CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. Checking for an Intermittent DTC.

2. (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT VOLTAGE




1. Turn the ignition off.
2. Disconnect the A/C Pressure Transducer harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (C818) A/C Pressure Sensor Supply circuit in the A/C Pressure Transducer harness connector.

Is the voltage above 4.5 volts?

Yes

- Go To 6

No

- Go To 3

3. (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO GROUND




1. Turn the ignition on.
2. Disconnect the C1 TIPM harness connector.
3. Measure the resistance between ground and the (C818) A/C Pressure Sensor Supply circuit in the A/C Pressure Transducer harness connector.

Is the resistance above 100 ohms?

Yes

- Go To 4

No

- Repair the short to ground in the (C818) A/C Pressure Sensor Supply circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO THE (C918) SENSOR GROUND CIRCUIT




1. Measure the resistance between the (C818) A/C Pressure Sensor Supply circuit and the (C918) Sensor Ground circuit in the A/C Pressure Transducer harness connector.

Is the resistance above 100 ohms?

Yes

- Go To 5

No

- Repair the short between the (C818) A/C Pressure Sensor Supply circuit and the (C918) Sensor Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

5. EXCESSIVE RESISTANCE IN THE (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT




1. Measure the resistance of the (C818) A/C Pressure Sensor Supply circuit between the A/C Pressure Transducer harness connector and the C1 Totally Integrated Power Module (TIPM) harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 10

No

- Repair the excessive resistance in the (C818) A/C Pressure Sensor Supply circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

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




1. Turn the ignition off.
2. Disconnect the C1 Totally Integrated Power Module (TIPM) harness connector.
3. Measure the resistance between ground and the (C18) A/C Pressure Transducer Signal circuit in the A/C Pressure Transducer harness connector.

Is the resistance above 100 ohms?

Yes

- Go To 7

No

- Repair the short to ground in the (C18) A/C Pressure Transducer Signal circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

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




1. Measure the resistance between the (C18) A/C Pressure Transducer Signal circuit and the (C918) Sensor Ground circuit in the A/C Pressure Transducer harness connector.

Is the resistance above 100 ohms?

Yes

- Go To 8

No

- Repair the short between the (C18) A/C Pressure Transducer Signal circuit and the (C918) Sensor Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

8. EXCESSIVE RESISTANCE IN THE (C18) A/C PRESSURE TRANSDUCER SIGNAL CIRCUIT




1. Measure the resistance of the (C18) A/C Pressure Transducer Signal circuit between the A/C Pressure Transducer harness connector and the C1 TIPM harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 9

No

- Repair the excessive resistance in the (C18) A/C Pressure Transducer Signal circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

9. A/C PRESSURE TRANSDUCER
1. Turn the ignition off.
2. Connect the C1 TIPM harness connector.
3. Turn the ignition on.
4. With the scan tool, read the A/C Pressure Transducer signal voltage.

NOTE: The sensor voltage should be approximately 5.0 volts (plus or minus.1 volt) with the connector disconnected.

Does the scan tool display the voltage as described above?

Yes

- Replace the A/C Pressure Transducer.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 10

10. TOTALLY INTEGRATED POWER MODULE (TIPM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the A/C Pressure Transducer and the Totally Integrated Power Module (TIPM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
5. Look for the data to change or for the DTC to reset during the wiggle test.
6. Search for any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace and program the Totally Integrated Power Module (TIPM).
- Perform the BODY VERIFICATION TEST. Body Verification Test.

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