Temperature gauge not working?

OLLIE2022

MEMBER
1994 DODGE RAM
5.9L
V8
2WD
AUTOMATIC
300,000 MILES

Replaced both coolant temperature sensors beside the thermostat which is new still no gauge. Is it common to go out or should intrace the wire or replace it? I'm flustered.

Monday, November 28th, 2022 AT 3:50 PM

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

There is a chance the wiring is causing issues, the PCM isn't receiving a signal, or the gauge is faulty.

Here is what to do: At the ECT, there are two wires. One is tan with a black tracer and the other is blue with a light blue tracer.

The tan/black wire provides a 5v reference from the PCM. With the key on, confirm that is the case.

The blue/light blue wire is a ground reference from the PCM. Again, with the key on, check that wire for continuity to ground.

Let me know what you find.

Take care,

Joe

See pic below.

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Monday, November 28th, 2022 AT 10:11 PM

OLLIE2022

MEMBER
49 POSTS

Ect?

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Tuesday, November 29th, 2022 AT 11:25 AM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

I'm sorry. ECT stands for engine coolant temperature sensor. I apologize. I'm used to using technical jargon in the shop.

Let me know what you find or if you have other questions.

Take care,

Joe

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Tuesday, November 29th, 2022 AT 7:14 PM

OLLIE2022