Yes 2 wires to one connector.

I tried to follow it and it jumps right into a group of about 50 wires.


Could the wires be bad at the ect as they tend to get tugged on a little when unhooking it.

 

Ok, tan wire with black trace is power wire for the sensor. Should be five volts there. Goes to pin 16 on connector 1 at the PCM. ground, or, signal wire back to the pcm is black with light blue trace. That one goes to pin 4 on connector 1.

Disconnect the battery...... unplug C1 from the pcm, and unplug the temp sensor. Now, back probe the wires checking resistance to ground. Both wires should be infinite resistance. Check resistance across the two pins in the sensor connector, should still be infinite resistance. Let us know what ya find.

 

Thanks for the info, this should be fun.

I will let you know.

Thanks again.

 

Haynes shows 2 sensors, but their info is sometimes generic and not necessarily year specific. FSM I have is for 2001. ON a 99 there is only one on the intake, so if there is a second sensor I do not know where it is as I have not had to look for it on mine. Cannot remember if it was 1 wire or two. I'll look tomorrow if you still do not have it resolved. Mine is a 5.2l so I don't know if that would make a difference either.

 

There is only one sensor on a 99.

 

Any idea if the code would cause the temp gauge on the dash to be erratic?

 

What ever is causing the code might, yes. Do what others have suggested.

 

Did you by any chance use (thread/teflon/pipe) tape when you installed the new sensor?

 

The new sensor had the red paste type already on it from car quest.

The previous one did not have anything on it but they both had the same problem, so I doubt thats it.

 

Were you able to check the wiring as I outlined?

Sensor doesn't need to be grounded to the manifold to work. It's a two-wire... it modifies a signal.

The gauge in the dash is driven by the PCM. PCM tells the central timer module what the gauge should read, and the CTM passes that along to the instrument cluster. The cluster will only display what it is told to. If what it is told is WRONG, then, oddly enough, it will display the wrong information.