HVAC System - Manual

DTC P0530 (LU3, LR4, LM7, LQ4, and L18)

Circuit Description

The powertrain control module (PCM) or engine control module (ECM) 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 too high the PCM will not allow the A/C compressor clutch to engage.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0530 Air Conditioning Refrigerant Pressure Sensor Circuit

Conditions for Running the DTC

The PCM/ECM detects an A/C request.

Conditions for Setting the DTC

* The A/C refrigerant pressure sensor signal is less than 0.1 volt for 5 seconds.
* The A/C refrigerant pressure sensor signal is greater than 4.9 volts for 5 seconds.

Action Taken When the DTC Sets

The malfunction indicator lamp (MIL) will not illuminate.

Conditions for Clearing the DTC

* The DTC will become history if the PCM/ECM 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

For an intermittent, Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

Test Description

Step 1 - Step 10:

Step 11 - Step 16:

The numbers below refer to the step numbers on the diagnostic table.
3. This step tests for the proper operation of the circuit in the low voltage range.
4. This step 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.
5. This step tests for a short to voltage in the 5-volt reference circuit.
6. This step tests for a high resistance or an open in the low reference circuit.