Temperature gauge not working

Good morning,

There is a sensor for the engine temperature on the front of the driver's side head.

I attached a picture for you to view. This is the most common reason for the gauge not working.

Roy

Okay, but when I plug my scanner in to the OBD2 diagnostic connector it reads the engine temperature. That's why I thought the cht sensor was okay and it had to be the ECT on the intake it has both?

If it is reading engine temperature on the scan tool, then you either have wiring issue from the ECM to the dash or the cluster is bad.

Roy

I tried a used cluster that was working in the other truck and it didn't fix problem. then I jumped the two wires at the engine cooling sensor and the gauge pegged to hot so I assumed the wiring was okay.

Change the coolant sensor.

Roy

I did replace the ECT twice one from Rock Auto and One from NAPA and the plug wire to and tested the red with white wire it has 10 K oms.

The yellow and red wire is it the ground wire?

No, neither are grounds. The sensor has 5 volts going to it and the other is a return signal wire to the PCM. Then the PCM sends a signal to the dash for the gauge.

Do you have a scan tool that can read engine temperature?

Roy

Yes I do. But what is the voltage for red with white wire at ECT sensor unplugging with key on. And same question for yellow with red wire?

I know I need to test wiring from PCM to gauge cluster, but have no information on test procedure and no information for pin location for connector at PCM and gauge cluster.

Okay, I attached a diagram for you to view.

This is not something you can test with a voltmeter. The only thing you can do is to check the connector at the back of the cluster. The controls for the gauge are in the solid state unit in the cluster.

Roy

Can you please send me a clear copy or a link that I can see or download? thanks, Jeff

You can try this link:

Roy

https://www.2carpros.com/images/question_images/271687/original.jpg

You have helped me, but I need a complete image of cluster wiring.

That is the only image of the cluster. As I stated before, there is nothing you can check internally as it is controlled by a microprocessor in the cluster itself.

Roy

Okay, thank you for your time. I just was hoping for a link or a web sight that I could look up images on my own.

You could go to Alldata.com and get a one day pass or longer and get all the information you want. Well worth it.

Roy

Did you respond? I got a notification but no response.

Roy

Thank you, but I don't have a credit card.

There is no charge for anything in our site?

Roy

No about getting Alldata for a one day trial, but thanks for your help.

Okay, I understand.

You are welcome.

Roy