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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2771 (Engine Controls - Pinpoint Test KE: Idle Air Control (IAC) Valve Through Pinpoint Test QA: Unable To Activate Self-Test/Network Communication Error/DTC P1001 - CNG, Flex-Fuel & Gasoline) >> Pinpoint Test KE: Idle Air Control (IAC) Valve >> Test Procedure

Test Procedure

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NOTE: Proceed to DTC testing steps listed in FAULT CODE SETTING CONDITION  table of fault code setting condition.
FAULT CODE SETTING CONDITION

Fault Code KOEO KOER Continuous Memory
P0505  KE2  KE2  KE2
P0506  KE2  KE2  KE2
P0507  KE13  KE13  KE13
P0511  KE2  KE2  KE2
P1504  KE2  KE2  KE2
P1506  KE2  KE2  KE2
P1507  KE2  KE2  KE2
  1. KE1 IDLE CONCERNS OR STALLS: RUN THE KOER SELF-TEST AND OUTPUT THE CMDTCS 
    NOTE: The Symptom Charts indicate there was no change in idle quality when the IAC valve was disconnected.
    • CHECK the air inlet for plugging or a stuck IAC pintle.
      • Repair as necessary.
    • Retrieve all continuous memory DTCs.
    • Carry out the KOER self-test.
    • If unable to carry out the KOER self-test, go to the next diagnostic step.

    Are any of the following DTCs present: P0505, P0511 or P0506? 

    Yes No
    Key in OFF position
    GO to  KE2.    		 The IAC system is OK. Return to SYMPTOM CHARTS - CNG, FLEX-FUEL & GASOLINE .
  2. KE2 DTCS P0505, P0506, P0511, P1504 OR P1507: (OR STARTS ONLY AT PART THROTTLE) CHECK THE VPWR VOLTAGE TO THE IAC VALVE 
    NOTE: If EGR DTC P0402 was output during the self-test, diagnose it first before continuing with this pinpoint test.
    • IAC Actuator connector disconnected.
    • Key in ON position.
    • Measure the voltage between:
    ( + ) IAC Actuator Connector, Harness Side ( - ) Vehicle Battery
    VPWR - Pin 1 Negative terminal

    Is the voltage greater than 10.5 V? 

    Yes No
    Key in OFF position
    GO to  KE3.    		 Key in OFF position. REPAIR the open circuit.
  3. KE3 CHECK THE RESISTANCE OF IAC VALVE 
    • IAC Actuator connector disconnected.
    • Measure the resistance between:
    ( + ) IAC Actuator Connector, Component Side ( - ) IAC Actuator Connector, Component Side
    IAC - Pin 2 VPWR - Pin 1

    Is the resistance between 6 ohms - 15 ohms? 

    Yes No
    GO to  KE4. INSTALL a new IAC Valve.
  4. KE4 CHECK THE IAC VALVE FOR AN INTERNAL SHORT TO THE IAC CASE 
    • Measure the resistance between:
    ( + ) IAC Actuator Connector, Component Side ( - ) IAC Actuator Connector, Component Side
    IAC - Pin 2 IAC Case

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  KE5. INSTALL a new IAC actuator.
  5. KE5 CHECK THE AIR INLET FOR PLUGGING OR A STUCK IAC PINTLE 
    • INSPECT the entire intake air system for debris, blockage or other damage.
    • Remove and inspect the IAC valve and check the pintle movement. Check the air tubes (if equipped) for blockage or damage.
    • Remove and inspect the air cleaner element for excessive dirt.

    Is the IAC valve and intake air system OK? 

    Yes No
    Restore the inlet air system
    GO to  KE6.    		 INSTALL a new IAC valve, or REPAIR the air inlet as necessary.
  6. KE6 CHECK FOR INLET AIR LEAKS 
    • Key on engine running.
    • With the engine running at idle, listen for vacuum leaks.
    • INSPECT the entire air intake system from the mass air flow (MAF) sensor to the intake manifold for leaks such as:
    • Damaged or loose IAC air tubes.
    • Cracked or punctured intake air tube.
    • Loose intake air tube at the air cleaner housing or throttle body.
    • IAC valve or gasket seal.
    • EGR valve gasket seal.
    • Vacuum supply connector and hose.
    • PCV valve, connectors and hoses.

    Are any leaks detected in the above areas? 

    Yes No
    Key in OFF position
    Repair as necessary.    		 Key in OFF position
    GO to  KE7.
  7. KE7 CHECK THE IAC CIRCUIT FOR AN OPEN IN THE HARNESS 
    NOTE: REFER to the POWERTRAIN CONTROL MODULE (PCM) CONNECTOR  in the beginning of this pinpoint test.
    • IAC Actuator connector disconnected.
    • PCM connector disconnected.
    • Measure the resistance between:
    ( + ) IAC Actuator Connector, Harness Side ( - ) PCM Connector, Harness Side
    IAC - Pin 2 IAC

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  KE8. REPAIR the open circuit.
  8. KE8 CHECK THE IAC CIRCUIT FOR A SHORT TO POWER IN THE HARNESS 
    • Key in ON position.
    • Measure the voltage between:
    ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
    IAC Negative terminal

    Is the voltage less than 1 V? 

    Yes No
    Key in OFF position
    GO to  KE9.    		 Key in OFF position. REPAIR the short circuit.
  9. KE9 CHECK THE IAC CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Diagnostic tool connector disconnected.
    • Measure the resistance between:
    ( + ) PCM Connector, Harness Side ( - )
    IAC Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  KE10. REPAIR the short circuit.
  10. KE10 VERIFY THE DTC 

    Is DTC P0511 or P1504 present in continuous memory or from the KOER self-test? 

    Yes No
    INSTALL a new PCM. GO to  KE11.
  11. KE11 CHECK THE IAC SIGNAL FROM THE PCM 
    • PCM connector connected.
    • IAC Actuator connector connected.
    NOTE: If stalling occurs, place a shim under the hard stop screw to maintain idle conditions.
    • Key on engine running.
    • Access the PCM and monitor the RPM PID.
    • Access the PCM and monitor the IAC PID.
    • With the engine at normal operating temperature, closed throttle and all accessories off, the IAC duty cycle should be between approximately 22% and 65%.
    • Slowly increase the engine speed to 3,000 RPM and return to closed throttle. (Note: If closed throttle RPM is significantly higher than normal, ignore this step).

    Is the duty cycle between 22% - 65%? 

    Yes No
    GO to  KE12. Key in OFF position. INSTALL a new IAC actuator.
  12. KE12 VERIFY THE DTC 

    Is DTC P0506, P0511, P1504 or P1507 present in continuous memory or from the self-test? 

    Yes No
    GO to  KE18. Key in OFF position
    INSPECT the throttle body for damage. REPAIR as necessary. If OK, INSTALL a new IAC actuator
    RESET the keep alive memory (KAM). REFER to RESETTING THE KEEP ALIVE MEMORY (KAM) .
  13. KE13 DTCS P0507 OR P1506: CHECK FOR INLET AIR LEAKS 
    • Key on engine running.
    • With the engine running at idle, listen for vacuum leaks.
    • INSPECT the entire air intake system from the mass air flow (MAF) sensor to the intake manifold for leaks such as:
    • Damaged or loose IAC air tubes.
    • Cracked or punctured intake air tube.
    • Loose intake air tube at the air cleaner housing or throttle body.
    • IAC valve or gasket seal.
    • EGR valve gasket seal.
    • Vacuum supply connector and hose.
    • PCV valve, connectors and hoses.

    Are any leaks detected in the above areas? 

    Yes No
    Key in OFF position. Key in OFF position.
    Repair as necessary. GO to  KE14.
  14. KE14 CHECK THE EVAP SYSTEM FOR A STUCK OPEN VALVE 
    • Disconnect the hoses at the EVAP canister purge valve or the VMV.
    • Connect a hand vacuum pump at the fuel vapor-to -EVAP canister port on the EVAP canister purge valve (VMV).
      Fig 1: Identifying EVAP Canister Purge Valve Fuel Vapor-To-EVAP Canister Port
      G03626751Courtesy of FORD MOTOR CO.
    • Apply 53 kPa (16 in-Hg) of vacuum to the EVAP canister purge valve (VMV).

    Does the EVAP canister purge valve (VMV) hold a vacuum for at least 20 seconds? 

    Yes No
    Reconnect all hoses
    GO to  KE15.    		 INSTALL a new EVAPCP valve.
  15. KE15 CHECK THE IAC VALVE FOR CORRECT FUNCTION 
    • Key on engine running.
    • Bring the engine to normal operating temperature.
    • Transmission in PARK or NEUTRAL.
    • Disconnect the IAC Valve.

    Does the RPM drop or the engine stall? 

    Yes No
    Key in OFF position
    GO to  KE16.    		 Key in OFF position
    INSPECT the throttle body for damage. REPAIR as necessary. If OK, INSTALL a new IAC actuator
    RESET the keep alive memory (KAM). REFER to RESETTING THE KEEP ALIVE MEMORY (KAM) .
  16. KE16 CHECK THE IAC CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    NOTE: REFER to the POWERTRAIN CONTROL MODULE (PCM) CONNECTOR  in the beginning of this pinpoint test.
    • Diagnostic tool connector disconnected.
    • PCM connector disconnected.
    • Measure the resistance between:
    ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
    IAC Negative terminal

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  KE17. REPAIR the short circuit to GND.
  17. KE17 VERIFY THE SYMPTOM 

    Is a fast idle symptom currently present? 

    Yes No
    INSTALL a new PCM. GO to  KE18.
  18. KE18 CHECK THE IAC SYSTEM FOR AN INTERMITTENT OPEN OR SHORT 
    • PCM connector connected.
    • Key on engine running.
    • Access the PCM and monitor the IAC and RPM PIDs.
    • With the engine at normal operating temperature, closed throttle and all accessories off, the IAC duty cycle should be between approximately 22% and 65%.
    • Observe the PIDs while completing the following at idle:
      • Lightly tap on the and wiggle the harness connector to simulate road shock.
      • Grasp the vehicle harness closest to the IAC valve. Shake and bend a small section of the harness from the IAC to the dash panel and from the dash panel to the PCM.

    Do the IAC or RPM PIDs suddenly change in value, indicating a fault? 

    Yes No
    Key in OFF position
    ISOLATE the fault and REPAIR as necessary.    		 Key in OFF position
    GO to  KE19.
  19. KE19 VERIFY THE SYMPTOM 

    Is an idle quality, starting or stalling symptom currently present? 

    Yes No
    INSTALL a new IAC actuator. Concern is elsewhere. RETURN to SYMPTOM CHARTS - CNG, FLEX-FUEL & GASOLINE for further direction.
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