coolant temp gauge problem

[morelan85]

I searched mulitple forums and didnt really find an answer so i will try this I replaced the sensor in the head and it stll not reading anything needle doest even flinch all other gauges work fine is there a fuse for this gauge ( Im hoping) that I missed or should i replace the pigtail or get an aftermarket gauge? thanks in advance for any help

[BadBlackZee]

Have you tried tracing the wires from the sensor? I know its a pain to open up all the wire loom, but the wiring for that sensor runs awfully close to the headers and the block. There is no separate fuse for the temp gauge...if it were a fuse, other gauges/devices would not be functioning.

[95ImpySS]

Yeap, First way to decide if there is a wring problem or if the gauge cluster has malfunctioned is to check the wire. An easier less time consuming way to check is to disconnect the sensor. Then find the pin on the PCM harness and test for continuity between the two. If there is 0 ohms of resistance and continuity then the wiring from the sensor to the PCM is good.

Visit: shbox.com for wiring diagrams.

[morelan85]

holy shit Ive never looked at a wiring diagram before its confusing as hell but im going to see if I can figure this out thanks for the advice

[morelan85]

Well it didnt take much open of the loom before I found a burnt/frayed spot in the wire so can I just cut out that section and put a connector on there to reconnect?

[1995z28]

The simplest way to check if its the guage or the sensor is to remove the plug/wire from the sensor and ground it. If the guage goes to MAX temp then the wire all the way to the guage is good, if that doesnt work then there is an open somewhere in the wire and the troubleshooting begins, so get your self a multi meter. If u need any advice i am an excellent trouble shooter, its what i do for a living, so just let me know.

[1995z28]

Oh and a temp sensor is nothing but a variable resistor so grounding the wire out will give it max resistance.