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Home >> Ford >> 2005 >> Escape Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1716 (Engine Controls - Pinpoint Test KE: Idle Air Control (IAC) Valve Through Pinpoint Test Z: Intermittent - (Except Diesel & Hybrid)) >> Pinpoint Test Km: Air Conditioning Clutch Relay (A/CCR) Circuit >> Test Procedure

Test Procedure

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  1. KM1 CHECK FOR 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 DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .
  2. KM2 KOEO AND KOER DTCS P1460 OR P0645: VERIFY THAT THE A/CCS 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.
    • Key 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. A/CCS input to PCM is requesting A/C. REFER to the appropriate CLIMATE CONTROL SYSTEM GENERAL INFORMATION article to diagnose the A/C system.
  3. KM3 CHECK THE VPWR VOLTAGE TO THE A/CC RELAY 
    • Key in OFF position.
    • A/CC Relay connector disconnected.
    • Key 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 
    • Key in OFF position.
    • 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  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.
    • Key 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 
    • Key in OFF position.
    • 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 the A/C and defrost off.
    REPEAT the self-test where DTC P1464 was retrieved.
  9. KM9 CHECK THE A/CCS PID 
    • Key ON, engine OFF.
    • A/C and defroster OFF.
    • Access the PCM and monitor the ACCS PID.

    Is the PID state ON? 

    Yes No
    The A/CCS PID indicates that the PCM is being requested to turn on the A/C. REFER to the appropriate CLIMATE CONTROL SYSTEM GENERAL INFORMATION article to diagnose the symptom. The A/CCS PID indicates that the A/CCS input to the PCM is low. VERIFY the test step results. Turn off the A/C and defrost. REPEAT the selftest.
  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.
    • Key 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 RLY 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.
    • Key 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 RLY 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. 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 
    • Refer to the appropriate CLIMATE CONTROL SYSTEM GENERAL INFORMATION article 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 concern present? 

    Yes No
    ISOLATE the concern and REPAIR as necessary. REFER to the appropriate CLIMATE CONTROL SYSTEM GENERAL INFORMATION article to continue diagnosis for the fast A/C cycling. GO to  KM13.
  13. KM13 CHECK FOR INTERMITTENT OPEN IN THE A/CCS CIRCUIT 
    NOTE: The A/CCS PID turns off and on quickly when a concern is present, indicating an intermittent open.
    • Key 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 AC_CYC 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) .    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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