P0530

P0530 AIR CONDITIONING (A/C) REFRIGERANT PRESSURE SENSOR CIRCUIT

Diagnostic Chart:

CIRCUIT DESCRIPTION

Wiring Diagram:

The A/C refrigerant pressure sensor responds to changes in A/C refrigerant high side pressure. This input indicates how much load the A/C compressor is putting on the engine. The PCM uses this input in order to determine the Idle Air Control (IAC) position for idle speed. The PCM supplies the A/C refrigerant pressure sensor with a 5V reference and a ground circuit. A signal voltage is sent back to the PCM by the A/C refrigerant pressure sensor which is proportional to the A/C pressure. The operating range of the sensor is between 0 and 459 psi. At 0 psi the signal voltage will read between 0.20 V varying to 5.0 V at 459 psi or above.

CONDITIONS FOR SETTING THE DTC
The A/C refrigerant sensor pressure is greater than 453 psi (4.90 V) with the A/C requested.

OR

The A/C refrigerant sensor pressure is greater than 363 psi (4.0 V) with the A/C not requested.

OR

The A/C refrigerant pressure sensor is less than 0 psi (0.10V) when the intake air temperature is greater than 0°C (32°F) and DTC P0112 or P0113 is not set.

OR

The A/C refrigerant sensor pressure is less than 0 psi (0.10 V) when an Intake Air Temperature (IAT) sensor DTC is present. Any of the above conditions are met for 15 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM records the operating conditions at the time the diagnostic fails. The Failure Records buffers stores this information.
^ The PCM stores a history DTC.
^ The PCM disables the A/C compressor clutch.

CONDITIONS FOR CLEARING THE DTC
^ A history DTC clears after 40 consecutive warm up cycles without a fault.
^ The scan tool can clear the DTC.

DIAGNOSTIC AIDS
^ An intermittent DTC P0530 set along with a DTC P0405 indicates that the ground circuit is shorting to the 5 volt reference circuit. When this happens, the EGR Actual Position on the scan tool will display an incorrect value. Check the wiring harness for being rubbed through and shorting together or for a faulty A/C refrigerant pressure sensor.

^ DTC P0530 sets when the signal voltage falls outside the normal possible range of the sensor. If the actual pressure of the A/C system matches the scan tool readings, repair any A/C pressure problems before using this table. Refer to Heating and Air Conditioning. Symptom Related Diagnostic Procedures

^ Any circuitry, that is suspected as causing the intermittent complaint, should be thoroughly checked for the following conditions:
- Backed out terminals.
- Improper mating of the terminals.
- Broken locks.
- Improperly formed or damaged terminals.
- Poor terminal to wiring connections.
- Physical damage to the wiring harness.

TEST DESCRIPTION
Number(s) below refer to the step number(s) on the Diagnostic Table.
1. The Powertrain OBD System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.

2. If the Manifold Absolute Pressure (MAP) or the Throttle Position (TP) sensor DTC is set, the malfunctioning circuit is diagnosed in these tables. Refer to the appropriate table/s.

10. An open or poor connection in a shared sensor ground circuit will cause other DTCs to be set. If no other DTCs were set, the malfunction must be between the sensor and the circuit splice.

12. Determines if the low voltage signal was from the sensor or the signal circuit. Jumping the signal circuit to the 5 volt reference checks the circuits, connections and the PCM.

13. An open in a shared 5 volt reference circuit can cause other DTCs to be set. If no other DTCs were set, the circuit must be open between the sensor and the circuit splice.

15. Replacement PCMs must be reprogrammed and the crankshaft position system variation procedure must be performed. Refer to the latest Techline information for PCM reprogramming and also refer to the Crankshaft Position (CKP) System Variation Learn Procedure. Service and Repair

26. If no malfunctions have been found at this point and no additional DTCs were set, refer to Diagnostic Aids for additional checks and information.