93 Ranger won't start, ICM or CPS

Discussion in '1993 - 1997 Ford Ranger' started by Grampa, Jan 27, 2017.

  1. Grampa

    Grampa New Member

    Hello, I have a problem with my 93 XLT Ranger 2.3L It ran but had a code 233 (SPOUT, IDM or DPI). I replaced the ICM and now it won't start. When I turn the key to the start position it sometimes fires one plug then just continues to crank. Supply voltage and ground are both good on the ICM.

    I get strange readings on signals from the CPS. Back probing PIP and CID wires at top of ICM and hand cranking results in 7 volts high and .1 volts low. The low is fine but shouldn't the high be over 10 volts?

    I disconnected the CPS, fed it battery + & ground and probed the outputs while turning the engine by hand. That gives 12.5 volts high and 0.1 volts low which seems like the right readings for a bench test which this basically is. So the CPS is good?

    I got a new CPS, plugged it in, tripped it with feeler gauges and read 5 volts high and .9 volts low when back probing PIP & CID at the ICM. Even the new CPS reads wrong.

    I don't know where to go from here. It seems like either the CPS or the ICM is bad but how do I tell. Remember the the truck ran with this CPS before I put in a new ICM. I forgot to mention that the new ICM failed the parts store test once then passed three times in a row. And the old ICM had to be busted up just to get it out so I can't go back to it.

    Has anyone seen this before? Any suggestions would be appreciated. :)

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