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Diagnostics test says idle air control underspeed error? how do i fix 1999 ford explorer

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  • mrwright_311 Oct 23, 2010

    thanks again duane. u the man!

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  • Ford Master
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Change the idle air control valve.

Idle Air Control (IAC) Valve OPERATION The Idle Air Control (IAC) valve controls the engine idle speed and dashpot functions. The valve is located on the side of the throttle body. This valve allows air, determined by the Powertrain Control Module (PCM) and controlled by a duty cycle signal, to bypass the throttle plate in order to maintain the proper idle speed. Fig. 1: Typical Idle Air Control (IAC) valve which is mounted to the throttle body - cutaway view shows air bypass direction diagnostics test says idle air control underspeed - 89684g16.gif
--- REMOVAL & INSTALLATION

  1. Disconnect the negative battery cable. To remove the IAC valve, first disconnect the negative battery cable, then the IAC wire harness plug 89684p03.jpg
    Next, remove the two IAC vdiagnostics test says idle air control underspeed - 89684p04.jpgng bolts . . . 89684p0diagnostics test says idle air control underspeed - 89684p05.jpg=
    . . . and pull the valve from the intake manifold 89684p05.jpg

  2. Disengage the wiring harness connector from the IAC valve.
  3. Remove the two retaining screws, then remove the IAC valve and didiagnostics test says idle air control underspeed - 89684p06.jpgd gasket. To install: When installing the valve, always discard the old gasket and install it using a new one 89684p06.jpg

  4. Clean the IAC valve mounting surface on the throttle body of old gasket material.
  5. Using a new gasket, position the IAC valve on the throttle body. Install and tighten the retaining screws to 71-106 inch lbs. (8-12 Nm).
  6. Attach the wiring harness connector to the IAC valve.
  7. Connect the negative battery cable.
  8. diagnostics test says idle air control underspeed - next.gif prev.gif next.gif

Posted on Oct 15, 2010

Testimonial: "thank you so much! "

  • mrwright_311 Oct 15, 2010

    duane. my explorer idles like a kitten in neutral, but stalls out in reverse and 1st gear. would replacing the iac valve do the trick, or do you think its something else, maybe a leak.

  • Duane Wong
    Duane Wong Oct 15, 2010

    It is likely to be a bad iacv, or a dirty passageway, or a vacuum leak somewhere under the hood.

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What is code P1507 IN A 1998 ford crow vic


P1507 - Idle Air Control (IAC) Underspeed Error This DTC is set when the PCM detects engine idle speed that is less than the desired rpm.
  • IAC circuit open
  • IAC circuit short to PWR
  • VPWR to IAC solenoid open
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  • The IAC solenoid resistance is from 6 to 13 ohms
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DTC Description Possible Causes Diagnostic Aides P1504 - Idle Air Control (IAC) Circuit Malfunction This DTC is set when the PCM detects an electrical load failure on the IAC output circuit.
  • IAC circuit open
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P1507 - Idle Air Control (IAC) Underspeed Error This DTC is set when the PCM detects engine idle speed that is less than the desired rpm.
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possible problems

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open or short
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