DTC Descriptors
DTC P0532: Air Conditioning (A/C) Refrigerant Pressure Sensor CircuitDTC P0533: Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit Low Voltage
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
5-Volt Reference Circuit | P0532 | P0532 | -- | -- |
A/C Refrigerant Pressure Sensor Signal Circuit | P0532 | P0532 | P0533 | -- |
Low Reference Circuit | -- | P0533 | -- | -- |
Circuit/System Description
The powertrain control module (PCM) monitors the refrigerant pressure through the A/C refrigerant pressure switch signal circuit. The ECM supplies a 5-volt reference and a low reference to the sensor. Changes in the A/C refrigerant pressure cause the sensor signal to the PCM to vary. When the pressure is high, the signal voltage is high. When the pressure is low, the signal voltage is low. When pressure is high, the PCM commands the cooling fans on. When pressure is too high or too low, the PCM will not allow the A/C compressor clutch to engage.
Conditions for Running the DTC
| • | Engine is running. |
| • | Any of the conditions for setting the DTC are met for 15 seconds. |
| • | Battery voltage is between 11-18 volts. |
Conditions for Setting the DTC
| • | The PCM detects that the A/C pressure is less than 1 psi (0.01 volt). |
| • | The PCM detects that the A/C pressure is more than 428 psi (4.92 volts). |
Action Taken When the DTC Sets
| • | The PCM will not illuminate the malfunction indicator lamp (MIL) |
| • | The PCM stores the Failure Records. |
| • | The A/C compressor clutch is disabled. |
Conditions for Clearing the DTC
| • | The history DTC will clear after 40 consecutive ignition cycles have occurred without a malfunction. |
| • | The DTC will become history if the PCM no longer detects a failure. |
Diagnostic Aids
A malfunction within the refrigerant system causing high pressure can cause this DTC to set.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the A/C pressure sensor.
- Ignition OFF, test for less than 1 ohm between the low reference circuit terminal A and ground.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal B and ground.
- Ignition OFF, disconnect the C1 harness connector at the PCM.
- Ignition ON, test for less than 0 volts on the signal circuit terminal C.
- Test for infinite resistance between the signal circuit terminal C and ground.
- Test for less that 1 ohm between the signal circuit terminal 11 and the signal circuit terminal C.
| ⇒ | If greater than specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PCM. |
| ⇒ | If less than specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PCM. |
| ⇒ | If greater than specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the PCM. |
| ⇒ | If greater than the specified value, test the signal circuit for an short to voltage. |
| ⇒ | If greater than the specified value, test the signal circuit for short to ground. |
| ⇒ | If greater than the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the A/C pressure sensor. If the DTC resets, replace the PCM. |
Repair Instructions
