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Cam Sensor Chronic Issue 900 1993

posted by  B.B. on  Mon Jul 22 15:06 CST 2024
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last visit: Mon Oct 6 13:15 CST 2014
[RELATED]

Hi Ag,

It turns out there's an early and late CPS.
Early CPS 1389567-7 Between pin 1 & 2 240 Ohms and a max of 400 ohms when engine is hot.
Late CPS 3547847-8 same pins read approx 170 ohms and a maximum of 350 ohms when the engine is hot. (I think you have the late model)
No high resistance shorts from pins 1 & 2 to pin 3 allowed.

Looking at the tach circuitry, It is in common with pin 1 of the power stage and the coil. Maybe the problem is corrosion at the power stage connector or a wonky power stage? Renew the thermal compound while you're at it.

Bill






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