1995 pontiac bonneville 3800. Coolant temp gauge goes from 0 to max. Upon reaching normal operating temperature gauge maxes out. Used scan tool to verify engine is at normal operating temperature with gauge maxed out. Unplug temperature sensor and gauge goes back to zero. Need wiring diagram to verify wiring and gauge condition.
Possible bad sending unit or shorted sending unit wiring.
Testimonial: "replaced the sensor, need a wiring diagram to verify DMM readings of the wiring are accurate."
Note that I used a scan tool to verify the ECT reading, and it is within normal operating temperature. This would rule out the sensor. It is a dual function sensor. The ECM uses it to maintain the fuel ratio, and the IC uses it for the Temp. gauge. Before condemning the IC, I would like to pin out the ECT wiring to verify its signal to the IC. I have already recorded the DVM readings at the ECT harness. Just need the wiring diagram.
Thanks though.
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