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question on IPS!!

Posted by LTUDSM, Dec 9, 2008

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  1. LTUDSM

    LTUDSM Proven Member

    1,323
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    Joined Jun 27, 2005
    Morrisville, Pennsylvania
    Heyy guys,how do i test IPS??? Because i think its bad (not working).I tried unplug the ISC and idle changed,was kinda surging.I plug it back and it was ok.Then i unplugged IPS ,the idle didn't changed.I thought my throttle cable was to tight,I loosen it up,but still the same thing.
    Where does the IPS wire comes from to the sensor??? Straight from ECU???
     

    453  0

    1995 Mitsubishi Eclipse GSX
    · 2G DSM
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  2. steve

    steve DSM Wiseman

    12,752
    537
    Joined Feb 3, 2002
    St. Charles, Illinois
    The green IPS wire goes to the ECU.
    Unplugged from the switch there should be 5v to 12v on the wire with the ECU turned on.

    The IPS should have continuity to ground with the throttle closed and open when the throttle opens slightly. Many people are missing the ground strap for the throttle body so that while the IPS works it doesn't actually ground the signal from the ECU.

    On a 90 TB
    90TBGround.jpg

    On a 91 TB
    91TBGround.jpg

    The final test, with the wire connected to the IPS and the ECU powered up you should see the voltage at the connector (and ECU pin) go from 0v when the throttle is closed to 5v - 12v when the throttle is open.

    This ground strap connects the TB to the intake manifold which is then connected to chassis ground by a braided wire strap between one of the bolts holding the throttle cable to the intake manifold and the firewall behind it.

    On a 2G the IPS is inside the TPS and uses the TPS ground on the connector.
     
    Last edited: Jan 11, 2018

    3K  0

    1991 Mitsubishi Eclipse GSX
    manual · 1G DSM
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  3. apckofllamas

    apckofllamas Proven Member

    136
    2
    Joined Aug 30, 2012
    Wellington, Ohio
    on my throttle body i am missing the ground strap for the IPS, how would i go about replacing this?
     

    Street Build 1K  0

    1990 Plymouth Laser RS Turbo
    manual · 1G DSM

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    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM
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