ECT sensor

[RYanmas9]

Hello again all,
Quick question. My temperature gauge is functioning. It shows normal range when driving. My problem is that my CEL is on due to it not communicating with the computer. I went to pull codes and its showing that its not getting a reading from the sensor and is at -40 degrees. Anyone suggest where I should start?

[RYanmas9]

Anything? Wire harness somewhere?

[lug]

You're going to have to toss a bone. What code did you pull? The gas versions have a splice to the PCM and the 6.8 actually has a CHT sensor for the PCM. The 7.3 feeds directly to the instrument panel and your functioning gauge.

[RYanmas9]

I have a 2002 7.3L. I have replace the thermostat and the sensor with no luck. It is showing code P0117.

[lug]

Manual or auto? Is that the original PCM or a suitable look a like from a junkyard?

[RYanmas9]

It's a manual. I believe its the original PCM from the factory. The only thing Im not sure of is what type of chip they had on it before or what they might have done when they took it out. When I installed my chip I didnt see any burn marks or anything that was damaged.

[lug]

The manual version uses pin 37 Org/Blk wire. I found a very nice wiring diagragm and I don't like linking to other sites but I saw you've been fighting this for awhile from a past post. Download the diagragm and resize it so you can easily trace the wires and see the color coding. My 2000 Ford wiring book was not a revised version and never mentions the manual using pin 37, only the auto is listed using it for the XMSN temp sensor. Since you changed the sensor and the thermostat that leaves checking the wires. I doubt it's a PCM failure, but you can't rule those out either. I hope you turn this problem into history. Check this out: Full Size Continuous Wire Diagram - Ford Truck Enthusiasts Forums

[RYanmas9]

Well lugz I fixed the problem. I never knew that there was another temperature sender underneath the tensioning pulley. Changed it out and problem fixed. Thanks for all your help

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[timmyboy76]

RYAN...you got a p/n for that sensor you replaced or a pic of its location? Only sensors i can think of in that area, are the CPS and the EBP sensors.

[RYanmas9]

I can get you one. The easiest thing to do is just feel with your hand behind the pulley and you'll find 2 wires.

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