ECD SYSTEM, Diagnostic DTC:P0532, P0533

DTC Code DTC Name
P0532 Open or Short to GND in Air Conditioning Pressure Sensor Circuit
P0533 Short to B+ in Air Conditioning Pressure Sensor Circuit

DESCRIPTION

The A/C pressure sensor sends the signals of A/C refrigerant pressure to the ECM. With this signal the ECM manage the cooling fan speed and A/C compressor operation.

DTC No. DTC Detection Condition Trouble Area Possible to Detect
Ignition Switch Engine Run
P0532 The output voltage from the A/C pressure sensor remains less than 0.15 V for 5 sec. or more.

  • A/C pressure sensor

  • A/C pressure sensor circuit

  • ECM

 ON ON
P0533 The output voltage from the A/C pressure sensor remains less than 4.85 V for 5 sec. or more.

  • A/C pressure sensor

  • A/C pressure sensor circuit

  • ECM

 ON ON

FAIL-SAFE

DTC No. Fail-safe Operation Fail-safe Deactivation Condition
P0532 Stops the A/C. Normal condition is restored.
P0533 Stops the A/C. Normal condition is restored.

WIRING DIAGRAM

A0138MLE01

INSPECTION PROCEDURE

Tech Tips


  • Do not use an ohmmeter to check the sensor because the sensor may be broken.

  • If the ECM is replaced, variant coding (variant coding indicates the presence of vehicle accessory items, A/C, etc.) should always be performed Click here.

  • Before removing the ECM and the peripheral parts, wait at least 3 minute after turning the ignition switch off (If the cooling fan is operating, remove the ECM and the peripheral parts after the fan stops.).

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (A/C PRESSURE SENSOR - ECM)


    1. A0136Q6E01

      Disconnect the A35 (A36) ECM connector.

    2. Disconnect the A31 A/C pressure sensor connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      LHD
      Tester Connection Specified Condition
      5V (A35-22) - A/C pressure sensor (A31-3) Below 1 Ω
      PDIN (A35-30) - A/C pressure sensor (A31-2) Below 1 Ω
      GND (A35-24) - A/C pressure sensor (A31-1) Below 1 Ω
      RHD
      Tester Connection Specified Condition
      5V (A36-22) - A/C pressure sensor (A31-3) Below 1 Ω
      PDIN (A36-30) - A/C pressure sensor (A31-2) Below 1 Ω
      GND (A36-24) - A/C pressure sensor (A31-1) Below 1 Ω
      Standard resistance (Check for short)
      LHD
      Tester Connection Specified Condition
      5V (A35-22) or A/C pressure sensor (A31-3) - Body ground 10 kΩ or higher
      PDIN (A35-30) or A/C pressure sensor (A31-2) - Body ground 10 kΩ or higher
      GND (A35-24) or A/C pressure sensor (A31-1) - Body ground 10 kΩ or higher
      RHD
      Tester Connection Specified Condition
      5V (A36-22) or A/C pressure sensor (A31-3) - Body ground 10 kΩ or higher
      PDIN (A36-30) or A/C pressure sensor (A31-2) - Body ground 10 kΩ or higher
      GND (A36-24) or A/C pressure sensor (A31-1) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT ECM (VOLTAGE)


    1. A01382KE01

      Disconnect the A31 A/C pressure sensor connector.

    2. Turn the ignition switch to the ON position.

    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Specified Condition
      A/C pressure sensor (A31-3) - Body ground 4.7 to 5.3 V

    NG

    CHECK POWER SOURCE CIRCUIT Click here

    OK

  3. INSPECT A/C PRESSURE SENSOR


    1. A0136XOE01

      Remove the A/C pressure sensor.

    2. Prepare 3 dry cell batteries (1.5 V) and 2 leads for connection of the batteries and the sensor.

    3. Connect the batteries in series.

    4. Connect the positive battery terminal to terminal 3 of the sensor, and the negative battery terminal to terminal 1.

    5. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Specified Condition
      1 - 2 0.15 V or more

    NG

    REPLACE A/C PRESSURE SENSOR

    OK

    REPLACE ECM

  4. CHECK POWER SOURCE CIRCUIT


    1. Check that the battery voltage, ECM power source voltage, and the ground condition of the ECM are normal.

      OK
      The battery voltage, ECM power source voltage, and the ground condition of the ECM are normal.

      Tech Tips

      Make sure that the battery is not discharged during the inspection.


    NG

    REPAIR POWER SOURCE CIRCUIT

    OK

    REPLACE ECM