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Test Procedure

  1. KM1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) 

    Are DTCs P0534, P0645, P1460, P1464 or P1469 present? 

    Yes No
    For KOEO and KOER DTCs P0645 or P1460, GO to  KM2.
    For continuous memory DTCs P0645 or P1460, GO to  KM10.
    For KOEO and KOER DTC P1464, GO to  KM8.
    For continuous memory DTCs P0534 or P1469, GO to  KM12.    		 For all others, GO to DTC LIST .
  2. KM2 KOEO AND KOER DTCS P1460 OR P0645: VERIFY THAT THE ACCS PID IS OFF 
    NOTE: Verify the A/C and the defrost are off during KOEO/KOER self-tests. If the vehicle is not equipped with A/C, the A/CCR circuit is not used and DTC P1460/P0645 can be ignored.
    • Ignition ON, engine running.
    • A/C and defroster OFF.
    • Access the PCM and monitor the ACCS PID.

    Is the PID state OFF? 

    Yes No
    GO to  KM3. REFER to the appropriate Climate Control System article , and DIAGNOSE the A/C is inoperative/does not operate correctly symptom.
  3. KM3 CHECK THE VPWR VOLTAGE TO THE A/CC RELAY 
    • Ignition OFF.
    • A/CC Relay connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
    (+) A/CC Relay Connector, Harness Side (-)
    VPWR Ground

    Is the voltage greater than 10 V? 

    Yes No
    GO to  KM4. REPAIR the open circuit.
    START the engine. TURN on the A/C switch. WAIT for 15 seconds. TURN off the A/C switch. REPEAT the self-test.
  4. KM4 CHECK THE A/CC RELAY 
    • Ignition OFF.
    • Carry out the A/CC relay component test. Refer to the appropriate Component Testing .

    Does the A/CC relay pass the component test? 

    Yes No
    GO to  KM5. INSTALL a new A/CC relay.
    START the engine. TURN on the A/C switch. WAIT for 15 seconds. TURN off the A/C switch.
    CLEAR the DTCs. REPEAT the self-test.
  5. KM5 CHECK THE A/CCR (WAC) CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS 
    • PCM connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
    (+) A/CC Relay Connector, Harness Side (-)
    A/CCR Ground

    Is the voltage less than 1 V? 

    Yes No
    GO to  KM6. REPAIR the short circuit.
    START the engine. TURN on the A/C switch. WAIT for 15 seconds. TURN off the A/C switch. REPEAT the self-test.
  6. KM6 CHECK THE A/CCR (WAC) CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Ignition OFF.
    • Measure the resistance between:
    (+) A/CC Relay Connector, Harness Side (-)
    A/CCR Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  KM7. REPAIR the short circuit.
    START the engine. TURN on the A/C switch. WAIT for 15 seconds. TURN off the A/C switch. REPEAT the self-test.
  7. KM7 CHECK THE A/CCR (WAC) CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Measure the resistance between:
    (+) A/CC Relay Connector, Harness Side (-) PCM Connector, Harness Side
    A/CCR A/CCR

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  KM14. REPAIR the open circuit.
    START the engine. TURN on the A/C switch. WAIT for 15 seconds. TURN off the A/C switch. REPEAT the self-test.
  8. KM8 KOEO AND KOER DTC P1464: VERIFY THE A/C AND DEFROST ARE OFF DURING THE SELF-TEST 
    • Verify the A/C and defrost are off during the self-test.

    Are the A/C and defrost off during the self-test? 

    Yes No
    GO to  KM9. TURN OFF the A/C and defrost.
    REPEAT the self-test where DTC P1464 was retrieved.
  9. KM9 CHECK THE ACCS PID 
    • Ignition ON, engine OFF.
    • A/C and defroster OFF.
    • Access the PCM and monitor the ACCS PID.

    Is the PID state ON? 

    Yes No
    The ACCS PID indicates the PCM is being requested to turn the A/C on. REFER to the appropriate Climate Control System article , and DIAGNOSE the A/C is inoperative/does not operate correctly symptom. The ACCS PID indicates that the ACCS input to the PCM is low. VERIFY the test step results. TURN OFF the A/C and defrost. REPEAT the self-test.
  10. KM10 CONTINUOUS MEMORY DTCS P1460 OR P0645: CHECK THE A/CCR (WAC) CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    NOTE: If the vehicle is not equipped with A/C, the A/CCR circuit is not used and the P1460/P0645 can be ignored.
    NOTE: The A/C clutch clicks on when a concern is present.
    • Ignition ON, engine OFF.
    • Check the A/CCR (WAC) circuit for short to ground while carrying out the following:
      • Wiggle, shake, and bend small sections of the wiring harness while working from the component to the module
      • Lightly tap on the A/CC relay to simulate road shock

    Is a concern present? 

    Yes No
    ISOLATE the concern and REPAIR as necessary. CLEAR the DTCs. START the engine. TURN on the A/C switch. WAIT for 15 seconds. TURN off the A/C switch. REPEAT the self-test. GO to  KM11.
  11. KM11 CHECK THE A/CCR (WAC) FOR AN OPEN OR SHORT CIRCUIT TO VOLTAGE 
    NOTE: The A/C clutch clicks off if a concern is present.
    • Ignition ON, engine OFF.
    • Enter output test mode. Refer to OUTPUT TEST MODE (OTM) .
    • Command the outputs ON.
    • Check the A/CCR (WAC) circuit for an open or short to voltage while carrying out the following:
      • Wiggle, shake, and bend small sections of the wiring harness while working from the component to the module
      • Lightly tap on the A/CC relay to simulate road shock
    • Command the outputs OFF.
    • Exit output test mode.

    Is a concern present? 

    Yes No
    ISOLATE the concern and REPAIR as necessary. CLEAR the DTCs. START the engine. TURN on the A/C switch. WAIT for 15 seconds. TURN off the A/C switch. REPEAT the self-test. Unable to duplicate or identify the concern at this time.
    GO to Pinpoint Test Z .
  12. KM12 CONTINUOUS MEMORY DTCS P0534 OR P1469: CHECK FOR CAUSES OF FAST A/CCS CYCLING 
    • Check the following:
      • A/C system pressure
      • A/CCS cycle times
    • REFER to the appropriate Climate Control System article and diagnose the air conditioning (A/C) is inoperative/does not operate correctly symptom.

    Is a concern present? 

    Yes No
    ISOLATE the concern and REPAIR as necessary. GO to  KM13.
  13. KM13 CHECK FOR INTERMITTENT OPEN IN THE A/CCS CIRCUIT 
    NOTE: The ACCS PID turns off and on quickly when a concern is present, indicating an intermittent open.
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the ACCS PID.
    • Turn on the A/C switch.
    • Check the A/CCR (WAC) circuit for an open or short to voltage while carrying out the following:
      • Wiggle, shake, and bend small sections of the wiring harness while working from the component to the module.
      • Lightly tap on the pressure switch (PS) (to simulate road shock).
    • Inspect the A/CCS connector.

    Is a concern present? 

    Yes No
    ISOLATE the concern and REPAIR as necessary. CLEAR the DTCs. START the engine. TURN on the A/C switch. WAIT for 15 seconds. TURN off the A/C switch. REPEAT the self-test. Unable to duplicate or identify the concern at this time.
    GO to Pinpoint Test Z .
  14. KM14 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test and verify the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , Programming the VID Block for a Replacement PCM. The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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