Orlando

DTC P0530, P0532, or P0533

The engine control module (ECM) monitors the high side refrigerant pressure through the A/C refrigerant pressure sensor. The ECM supplies a 5 V reference and a low reference to the sensor. Changes in the A/C refrigerant pressure cause the sensor signal to the ECM 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 ECM commands the cooling fans on. When pressure is too high or too low, the ECM will not allow the activation of the A/C compressor.

Engine is running.

P0530 03 or P0532 00

The ECM detects a short to ground or open at the A/C pressure sensor signal circuit.

P0530 07 or P0533 00

The ECM detects a short to voltage at the A/C pressure sensor signal circuit.

The condition for setting the DTC is no longer present.

Schematic Reference

HVAC Schematics : Automatic

Connector End View Reference

Component Connector End Views

Description and Operation

Automatic HVAC Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the harness connector at the B1 A/C Refrigerant Pressure Sensor.
2. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 2 and ground.

⇒	If less than 4.8 V

2.1.	Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2.2.	Test for infinite resistance between the 5 V reference circuit and ground.

⇒	If less than infinite resistance, repair the short to ground on the circuit.

⇓	If infinite resistance

2.3.	Test for less than 2 Ω in the 5 V reference circuit end to end.

⇒	If 2 Ω or greater, repair the open/high resistance in the circuit.

⇒	If less than 2 Ω, replace the K20 Engine Control Module.

⇒	If greater than 5.2 V

2.1.	Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2.2.	Ignition ON, test for less than 0.3 V between the 5 V reference circuit and ground.

⇒	If greater than 0.3 V, repair the short to voltage on the circuit.

⇒	If less than 0.3 V, replace the K20 Engine Control Module.

⇓	If within 4.8-5.2 V

3. Test for 4.8-5.2 V between the 5 V reference circuit terminal 2 and the low reference circuit terminal 1

⇒	If less than 4.8 V

3.1.	Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

3.2.	Test for less than 2 Ω in the low reference circuit end to end.

⇒	If 2 Ω or greater, repair the open/high resistance in the circuit.

⇒	If less than 2 Ω, replace the K20 Engine Control Module.

⇒	If greater than 5.2 V

3.1.	Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

3.2.	Ignition ON, test for less than 0.3 V between the low reference circuit and ground.

⇒	If greater than 0.3 V, repair the short to voltage on the circuit.

⇒	If less than 0.3 V, replace the K20 Engine Control Module.

⇓	If within 4.8-5.2 V

4. Verify the scan tool A/C High Side Pressure Sensor parameter is less than 0.3 V.

⇒	If greater than 0.3 V

4.1.	Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

4.2.	Ignition ON, test for less than 0.3 V between the signal circuit terminal 3 and ground.

⇒	If greater than 0.3 V, repair the short to voltage on the circuit.

⇒	If less than 0.3 V, replace the K20 Engine Control Module.

⇓	If less than 0.3 V

5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 2. Verify the scan tool A/C High Side Pressure Sensor parameter is greater than 4.8 V.

⇒	If less than 4.8 V

5.1.	Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

5.2.	Test for infinite resistance between the signal circuit and ground.

⇒	If less than infinite resistance, repair the short to ground on the circuit.

⇓	If infinite resistance

5.3.	Test for less than 2 Ω in the signal circuit end to end.

⇒	If 2 Ω or greater, repair the open/high resistance in the circuit.

⇒	If less than 2 Ω, replace the K20 Engine Control Module.

⇓	If greater than 4.8 V

6. Replace the B1 A/C Refrigerant Pressure Sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.