P0533

DTC P0533

CIRCUIT DESCRIPTION
The powertrain control module (PCM) monitors the high side refrigerant pressure through an A/C refrigerant pressure sensor. When the pressure is high the signal voltage is high. When the pressure is low, the signal voltage is low. When the pressure is high, the PCM commands the cooling fans ON. When the pressure is too high or too low, the PCM will not allow the A/C compressor clutch to engage.

CONDITIONS FOR RUNNING THE DTC
The engine is running.

CONDITIONS FOR SETTING THE DTC
P0532 The PCM detects an A/C pressure of less than 0.1 Volts.
P0533 The PCM detects an A/C pressure of more than 4.9 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.
- SERVICE A/C SYSTEM displays on the DIC.
- A/C OFF displays on the HVAC control module (IPM).

CONDITIONS FOR CLEARING THE DTC
- The DTC will become history if the PCM no longer detects a failure.
- The history DTC will clear after 40 fault-free ignition cycles.
- The DTC can be cleared with a scan tool.

DIAGNOSTIC AIDS
If the condition is not present, refer to Diagnostic Aids for Circuit Testing and Wiring Repair procedures.

TEST DESCRIPTION

Steps 1 - 4:

Steps 5 - 8:

Steps 9 - 14:

Steps 15 - 17:

The numbers below refer to the step numbers on the diagnostic table.
4. Tests for the proper operation of the circuit in the low voltage range.
5. Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.
6. Tests for a short to voltage in the 5-volt reference circuit.
7. Tests for a high resistance or an open in the low reference circuit.
16. Perform the recalibration procedure for the powertrain control module.