With Manual AC

DTC P0530

CIRCUIT DESCRIPTION
The powertrain control module (PCM) monitors the high side refrigerant pressure via a 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 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
- The engine is running.
- A/C has been requested.

CONDITIONS FOR SETTING THE DTC
- The PCM detects the signal circuit is less than 5 counts (0.09 volt) or more than 250 counts (4.90 volts).
- The condition exists for 20 seconds.

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 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 Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids.

TEST DESCRIPTION

Steps 1-2:

Steps 3-5:

Steps 6-10:

Steps 11-15:

Steps 16-17:

The numbers below refer to the step numbers on the diagnostic table:
4. If the pressure signal voltage stays high after disconnecting the pressure sensor electrical connector, the signal circuit is shorted to voltage, or the PCM is faulty.
7. Tests for a high resistance or for an open in the ground circuit.
16. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). Before you replace the PCM, program the new PCM.