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Old 05-02-2012
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Cooant Sending Issues

Hi Everyone,

I am having issues with the coolant gauge not working, I thought that it was a bad sensor on the back side of engine, I replaced it but no change, I tested the instrument cluster with my snap on tester gauge did it's own self test and passed but I am not getting no continuity through the red wire but I am getting continuity through the black? Any Suggest ments??

I have a 2006 Ranger 2.3 DOHC I4

Thanks
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Old 05-02-2012
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The ECT sensor connector should have a Red with White Stripe wire (from gauge) and a Black with White Stripe wire (to ground). If you turn the key to on engine off and momentarily ground the Red with White stripe wire, the gauge should go full scale. If it does, the wiring going to and gauge can be assumed functional. If the Black with White stripe wire has continuity (.1 ohms or less) to chassis ground, the ground circuit can be assumed good. This would only leave the sensor as the problem.
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Old 05-03-2012
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Originally Posted by Rev View Post
The ECT sensor connector should have a Red with White Stripe wire (from gauge) and a Black with White Stripe wire (to ground). If you turn the key to on engine off and momentarily ground the Red with White stripe wire, the gauge should go full scale. If it does, the wiring going to and gauge can be assumed functional. If the Black with White stripe wire has continuity (.1 ohms or less) to chassis ground, the ground circuit can be assumed good. This would only leave the sensor as the problem.
done this and no change on gauges I know it is electrical now but I need to find out where this wiring is going in the loom to pull down unless there is another sensor that is on this truck that can be the calphreat. I heard that there is two sensors one in the head and one in the ECT on the supply pipe.
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Old 05-03-2012
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done this and no change on gauges I know it is electrical now but I need to find out where this wiring is going in the loom to pull down unless there is another sensor that is on this truck that can be the calphreat. I heard that there is two sensors one in the head and one in the ECT on the supply pipe.
Yes there are two sensors. One is in the cylinder head and is referred to as the CHT sensor. Its connector has a Yellow with Light Green stripe wire (VREF) and a Gray with Red stripe wire (SIG RTN) that goes to the PCM but has nothing to do with the gauge.

The ECT sensors Red with White stripe wire runs to connector C220B that plugs into the back of the instrument cluster.
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Old 05-03-2012
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Yes there are two sensors. One is in the cylinder head and is referred to as the CHT sensor. Its connector has a Yellow with Light Green stripe wire (VREF) and a Gray with Red stripe wire (SIG RTN) that goes to the PCM but has nothing to do with the gauge.

The ECT sensors Red with White stripe wire runs to connector C220B that plugs into the back of the instrument cluster.
OK, I appreciate it is there any way for me to find out where the loom goes to so I can tear down it instead of unrevaling all looms?
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Old 05-04-2012
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OK, I appreciate it is there any way for me to find out where the loom goes to so I can tear down it instead of unrevaling all looms?
The wire in question runs through the engine harness to the main firewall connection then into the IP harness and up behind the instrument cluster.

What I'd recommend is pulling the cluster, locate pin 6 in C220B (Red with White stripe wire) and testing between this pin and the sensors connector under hood.

If your meter leads aren't long enough, place a short jumper wire between the two terminals in the sensors connector (Red with White stripe and Black with White stripe wire). Then connect one probe from your meter to pin 6 C220B and the other to chassis ground.

Either way you should read continuity (.1 ohms or less). If that checks out good, you're probably looking at a problem within the cluster or gauge. .
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