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Where is the engine computer board located? - 1983 Ford F150

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  • Ford Master
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Size engine please
Lee

Posted on Dec 09, 2010

  • 4 more comments 
  • Auto Repair Help
    Auto Repair Help Jan 03, 2011

    ggf

  • Auto Repair Help
    Auto Repair Help Jan 03, 2011

    fig 12

  • Auto Repair Help
    Auto Repair Help Jan 03, 2011

    fig 12


  • Auto Repair Help
    Auto Repair Help Jan 03, 2011

    TC P1517: IDLE AIR CONTROL (IAC) SOLENOID
    VALVE SIGNAL NO. 4 CIRCUIT HIGH INPUT - EXCEPT IMPREZA & LEGACY 2.2L
    (CALIFORNIA EMISSIONS)






    1. Turn ignition off. Using an ohmmeter
    connected to ground, check resistance at ECM connector B134 terminal No. 7. If
    resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or
    more, repair open in wiring or poor contact between ECM and



    ground.


    2. Ensure ignition is off. Disconnect IAC
    solenoid valve connector. Turn ignition on. Using a voltmeter connected to
    ground, check voltage at ECM connector B134 terminals No. 5, 6, 19 and 29. If
    voltage is more than 10 volts on any circuit, repair short to



    voltage in wiring between
    ECM and IAC solenoid valve connectors, then replace ECM. If voltage is less
    than 10 volts on all circuits, replace ECM.






    TC P1520: RADIATOR FAN RELAY NO. 1 CIRCUIT
    HIGH INPUT
    color:red">





    1. Turn ignition off. Connect test mode
    connector. See
    color:blue">Fig. 2color:black"> . Turn ignition on. Using voltmeter connected to ground,
    backprobe ECM connector B134 terminal No. 3. If voltage changes between zero
    and 10 volts, system has returned to normal. Check for



    intermittent open in wiring
    or connectors. If voltage does not change between zero and 10 volts, go to next
    step.



    2. Turn ignition off. Remove main fan relay and
    sub fan relay No. 1 (if equipped). Turn ignition on. Using voltmeter connected
    to ground, backprobe ECM connector B134 terminal No. 3. If voltage is more than
    10 volts, repair short to voltage in relay control



    circuit. After repair,
    replace ECM. If voltage is 10 volts or less, go to next step.



    3. Turn ignition off. Remove fan relay. Using an
    ohmmeter, check resistance between main fan relay terminals. See
    Fig.
    12
    color:black"> . If resistance is less than one ohm, replace main fan relay,
    then replace ECM. If resistance is one ohm or more, go to next step.










    TC P1517: IDLE AIR CONTROL (IAC) SOLENOID VALVE SIGNAL NO. 4 CIRCUIT HIGH INPUT - EXCEPT IMPREZA & LEGACY 2.2L (CALIFORNIA EMISSIONS)


    1. Turn ignition off. Using an ohmmeter connected to ground, check resistance at ECM connector B134 terminal No. 7. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in wiring or poor contact between ECM and

    ground.

    2. Ensure ignition is off. Disconnect IAC solenoid valve connector. Turn ignition on. Using a voltmeter connected to ground, check voltage at ECM connector B134 terminals No. 5, 6, 19 and 29. If voltage is more than 10 volts on any circuit, repair short to

    voltage in wiring between ECM and IAC solenoid valve connectors, then replace ECM. If voltage is less than 10 volts on all circuits, replace ECM.


    TC P1520: RADIATOR FAN RELAY NO. 1 CIRCUIT HIGH INPUT


    1. Turn ignition off. Connect test mode connector. See Fig. 2 . Turn ignition on. Using voltmeter connected to ground, backprobe ECM connector B134 terminal No. 3. If voltage changes between zero and 10 volts, system has returned to normal. Check for

    intermittent open in wiring or connectors. If voltage does not change between zero and 10 volts, go to next step.

    2. Turn ignition off. Remove main fan relay and sub fan relay No. 1 (if equipped). Turn ignition on. Using voltmeter connected to ground, backprobe ECM connector B134 terminal No. 3. If voltage is more than 10 volts, repair short to voltage in relay control

    circuit. After repair, replace ECM. If voltage is 10 volts or less, go to next step.

    3. Turn ignition off. Remove fan relay. Using an ohmmeter, check resistance between main fan relay terminals. See Fig. 12 . If resistance is less than one ohm, replace main fan relay, then replace ECM. If resistance is one ohm or more, go to next step.




  • Auto Repair Help
    Auto Repair Help Jan 03, 2011

    Fig. 12: Measuring Fan Relay Resistance
    Courtesy of SUBARU OF AMERICA, INC.

    4. If vehicle is not equipped with sub fan relay No. 1, go to next step. On vehicles equipped with sub fan relay No. 1, check resistance between sub fan relay No. 1 terminals No. 1 and 3. See Fig. 12 . If resistance is less than one ohm, replace sub fan relay
    No. 1, then replace ECM. If resistance is one ohm or more, go to next step.
    5. Check for poor terminal contact in ECM connector. Repair as necessary. If terminal contact is okay, replace ECM.

  • Auto Repair Help
    Auto Repair Help Jan 03, 2011

    Fig.
    12: Measuring Fan Relay Resistance



    Courtesy
    of SUBARU OF AMERICA, INC.






    4. If vehicle is not equipped with sub fan relay
    No. 1, go to next step. On vehicles equipped with sub fan relay No. 1, check
    resistance between sub fan relay No. 1 terminals No. 1 and 3. See
    Fig. 12 . If resistance
    is less than one ohm, replace sub fan relay



    No. 1,
    then replace ECM. If resistance is one ohm or more, go to next step.



    5. Check for poor terminal contact in ECM
    connector. Repair as necessary. If terminal contact is okay, replace ECM.






    DTC P1540: VEHICLE SPEED SENSOR (VSS)
    MALFUNCTION 2 - EXCEPT IMPREZA & LEGACY 2.2L (CALIFORNIA EMISSIONS)






    1. If vehicle is equipped with M/T, go to next
    step. If vehicle is equipped with A/T and DTC P0720 exists, diagnose DTC P0720
    first. If DTC P1540 is only DTC set, go to next step.



    2. Check speedometer operation. If speedometer
    operation is normal, on A/T, go to next step. If speedometer operation is
    normal on M/T, go to step
    4 . If speedometer operation is abnormal, check power supply
    and ground circuit to instrument cluster and



    connector
    between instrument cluster and VSS. Repair or replace parts as necessary.



    3. Turn ignition off. Disconnect TCM connector.
    Turn ignition on. Using voltmeter connected to ground, backprobe ECM connector
    B135 terminal No. 24. If voltage is more than 2 volts, check for an open in
    wiring between ECM and instrument cluster



    connectors,
    or for poor contact at instrument cluster or ECM connectors. If voltage is 2
    volts or less, go to next step.



    4. Turn ignition off. Disconnect appropriate ECM
    connector. Using an ohmmeter, measure resistance between ground and ECM
    connector B135 terminal No. 24. If resistance is less than 10 ohms, repair
    short to ground in wiring between ECM and



    instrument
    cluster connectors. If resistance is 10 ohms or more, repair poor contact at
    ECM.






    mso-fareast-font-family:"Times New Roman";mso-fareast-theme-font:minor-fareast;
    color:red;mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:
    AR-SA"> DTC 1560: BACK-UP VOLTAGE CIRCUIT
    MALFUNCTION

    Fig. 12: Measuring Fan Relay Resistance

    Courtesy of SUBARU OF AMERICA, INC.


    4. If vehicle is not equipped with sub fan relay No. 1, go to next step. On vehicles equipped with sub fan relay No. 1, check resistance between sub fan relay No. 1 terminals No. 1 and 3. See Fig. 12 . If resistance is less than one ohm, replace sub fan relay

    No. 1, then replace ECM. If resistance is one ohm or more, go to next step.

    5. Check for poor terminal contact in ECM connector. Repair as necessary. If terminal contact is okay, replace ECM.


    DTC P1540: VEHICLE SPEED SENSOR (VSS) MALFUNCTION 2 - EXCEPT IMPREZA & LEGACY 2.2L (CALIFORNIA EMISSIONS)


    1. If vehicle is equipped with M/T, go to next step. If vehicle is equipped with A/T and DTC P0720 exists, diagnose DTC P0720 first. If DTC P1540 is only DTC set, go to next step.

    2. Check speedometer operation. If speedometer operation is normal, on A/T, go to next step. If speedometer operation is normal on M/T, go to step 4 . If speedometer operation is abnormal, check power supply and ground circuit to instrument cluster and

    connector between instrument cluster and VSS. Repair or replace parts as necessary.

    3. Turn ignition off. Disconnect TCM connector. Turn ignition on. Using voltmeter connected to ground, backprobe ECM connector B135 terminal No. 24. If voltage is more than 2 volts, check for an open in wiring between ECM and instrument cluster

    connectors, or for poor contact at instrument cluster or ECM connectors. If voltage is 2 volts or less, go to next step.

    4. Turn ignition off. Disconnect appropriate ECM connector. Using an ohmmeter, measure resistance between ground and ECM connector B135 terminal No. 24. If resistance is less than 10 ohms, repair short to ground in wiring between ECM and

    instrument cluster connectors. If resistance is 10 ohms or more, repair poor contact at ECM.


    DTC 1560: BACK-UP VOLTAGE CIRCUIT MALFUNCTION

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