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Home >> Ford >> 2005 >> Focus ZX4 ST >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Pinpoint Test JE: Integrated Ignition Coil Pack A, B, Or C Failure Through Pinpoint Test KP: Charge Air Cooler (CAC) Pump - (Except Diesel & Hybrid) >> Pinpoint Test KM: Air Conditioning Clutch Relay (A/CCR) Circuit >> Test Procedure

Test Procedure

  1. KM1 KOEO AND KOER DTCS P1460 OR P0645: VERIFY THAT A/CCS PID IS OFF 
    NOTE: Verify the AC and the defrost are off during KOEO/KOER Self-Tests. If the vehicle is not equipped with AC, the WAC circuit is not used and DTC P1460/P0645 can be ignored.
    • Key on engine running.
    • AC and defroster OFF.
    • Access the PCM and monitor the ACCS PID.

    Is the PID state OFF? 

    Yes No
    Key in OFF position.
    GO to  KM2.    		 Key in OFF position.
    A/CCS input to PCM is requesting A/C.
    REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION to diagnose the A/C system.
  2. KM2 CHECK THE VPWR VOLTAGE TO A/CC RELAY 
    • A/CC Relay connector disconnected.
    • Key in ON position.
    • Measure the voltage between:
      (+) A/CC Relay Connector, Harness Side (-)
      VPWR Ground

    Is the voltage greater than 10.5 V? 

    Yes No
    Key in OFF position.
    GO to  KM3.    		 Key in OFF position. REPAIR the open circuit.
    START engine.
    TURN on A/C Switch.
    WAIT for 15 seconds.
    TURN off A/C Switch.
    REPEAT the self-test.
  3. KM3 CHECK THE A/CC RELAY 
    • REFER to the pin numbers molded on A/CC RELAY. Measure the resistance between either pin 1 or pin 85 and all the other pins of the relay. One measurement must be between 40 and 120 ohms, with the other measurements being greater than 10, 000 ohms.

    Are all the resistance checks OK? 

    Yes No
    GO to  KM4. INSTALL a new A/CC relay.
    START engine.
    TURN on A/C Switch.
    WAIT for 15 seconds.
    TURN off A/C Switch.
    REPEAT the self-test.
  4. KM4 CHECK THE A/CCR (WAC) CIRCUIT FOR A SHORT TO POWER IN THE HARNESS 
    • PCM connector disconnected.
    • Key in ON position.
    • Measure the voltage between:
      (+) A/CC Relay Connector, Harness Side (-)
      A/CCR Ground

    Is the voltage less than 1 V? 

    Yes No
    Key in OFF position.
    GO to  KM5.    		 REPAIR the short circuit.
    START engine.
    TURN on A/C Switch.
    WAIT for 15 seconds.
    TURN off A/C Switch.
    REPEAT the self-test.
  5. KM5 CHECK THE A/CCR (WAC) CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Measure the resistance between:
      (+) A/CC Relay Connector, Harness Side (-)
      A/CCR Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  KM6. REPAIR the short circuit.
    START engine.
    TURN on A/C Switch.
    WAIT for 15 seconds.
    TURN off A/C Switch.
    REPEAT the self-test.
  6. KM6 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
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .
    START engine.
    TURN on AC Switch.
    WAIT for 15 seconds.
    TURN off AC Switch.
    REPEAT the self-test.    		 REPAIR the open circuit.
    START engine.
    TURN on A/C Switch.
    WAIT for 15 seconds.
    TURN off A/C Switch.
    REPEAT the self-test.
  7. KM7 KOEO AND KOER DTC P1464: VERIFY THE A/C AND DEFROST WERE OFF 

    DURING THE SELF-TEST 

    • Verify the A/C and defrost were off during the self-test.

    Is A/C and defrost off during Self-Test? 

    Yes No
    GO to  KM8. A/C and defrost off.
    REPEAT the self-test where DTC P1464 was retrieved.
  8. KM8 CHECK THE A/CCS PID 
    • Key in ON position.
    • A/C and defroster OFF.
    • Access the PCM and monitor the ACCS PID.

    Is the PID state ON? 

    Yes No
    Key in OFF position.
    The A/CCS PID indicates that the PCM is being requested to turn on the A/C.
    REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION to diagnose the symptom.    		 The A/CCS PID indicates that the A/CCS input to the PCM is low.
    VERIFY test step results
    A/C and defroster OFF.
    REPEAT the self-test.
  9. KM9 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.
    • Key in ON position.
    • CHECK the A/CCR (WAC) circuit for a short to ground while performing the following: (the A/C clutch clicks on when a fault is detected).
      • Wiggle, shake, and bend small sections of the wiring harness while working from the component to the module.
      • Lightly tap on the A/CC RLY to simulate road shock.

    Is a fault indicated? 

    Yes No
    Key in OFF position.
    ISOLATE the fault and REPAIR as necessary.
    CLEAR the DTCs.
    START engine.
    TURN on A/C Switch.
    WAIT for 15 seconds.
    TURN off A/C Switch.
    REPEAT the self-test.    		 GO to  KM10.
  10. KM10 CHECK THE A/CCR (WAC) FOR AN OPEN OR SHORT CIRCUIT TO POWER 
    • Key in ON position.
    • Enter output test mode. Refer to OUTPUT TEST MODE (OTM) .
    • Command the outputs ON.
    • CHECK A/CCR (WAC) circuit for open or short to power while completing the following (the A/C clutch will click off if a fault is detected):
      • Wiggle, shake, and bend small sections of the wiring harness while working from the component to the module.
      • Lightly tap on the A/CC RLY to simulate road shock.

    Is a fault indicated? 

    Yes No
    Key in OFF position.
    ISOLATE the fault and REPAIR as necessary.
    CLEAR the DTCs.
    START engine.
    Turn On A/C Switch
    WAIT for 15 seconds.
    TURN off A/C Switch.
    REPEAT the self-test.    		 Key in OFF position.
    Unable to duplicate or identify the fault at this time.
    GO to PINPOINT TEST Z STEP 1 .
  11. KM11 KOEO AND KOER DTCS P0534 OR P1469: CHECK FOR CAUSES OF FAST A/CCS CYCLING 
    • REFER to CLIMATE CONTROL SYSTEM to check the A/C system pressure, to test the A/CCS cycle times, and to check for causes of fast A/CCS cycling time.

    Is a fault indicated? 

    Yes No
    ISOLATE the fault and REPAIR as necessary.
    REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION to continue diagnosis for the fast A/C cycling.    		 GO to  KM12.
  12. KM12 CHECK FOR INTERMITTENT OPEN IN A/CCS CIRCUIT 
    • Key in ON position.
    • Access the PCM and monitor the ACCS PID.
    • Turn on the A/C Switch.
    • CHECK A/CCR (WAC) circuit for open or short to power while completing the following (the A/CCS PID will turn off and on quickly when a fault is detected, indicating an intermittent open).
      • Wiggle, shake, and bend small sections of the wiring harness while working from the component to the module.
      • Lightly tap on the PS (to simulate road shock).
    • Inspect the AC_CYC connector.

    Is a fault indicated? 

    Yes No
    Key in OFF position.
    ISOLATE the fault and REPAIR as necessary.
    CLEAR the DTCs.
    START engine.
    TURN on A/C Switch.
    WAIT for 15 seconds.
    TURN off A/C Switch.
    REPEAT the self-test.    		 Key in OFF position.
    Unable to duplicate or identify the fault at this time.
    GO to PINPOINT TEST Z STEP 1 .
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