Can anyone help me get close to finding the right pin for my throttle position sensor or the knock sensor where the main harness connects to the computer at the firewall?
I'm trying to tap into a 5v source and need to know which one of the main harness wires is either the knock sensor or TPS wire.
Or if there is another 5volt source in that harness or under the dash?
Its a 2002 5.4 for reference.

 

Don't think either of those are going to be a 5V source.

The TPS will be a changing value, depending on the % of throttle.

Have not checked as of late, but I don't think the knock sensor is 5V.

 

SSCULLY,
I was thinking the same thing but checked both this morning....the input are both 5v. And your correct, the output is variable.....

 

PCM Connector pin 90 is the +5v Vref line. BR/WH wire.

It goes to the TPS, DPFE, and FTP sensors but does not go to the KS.

 

Perfect! Thats what I needed....I was close, I was thinking it was 89 but wasn't exactly sure.

 

Should have done that myself, a case of RTFM and I would not look so stupid
I kept having a thought in the back of my head prior to posting, but could not find the thread in the L forum on adjusting the TPS ( don't recall why it would need to be done either ), where I thought the voltages were in the 1.xx range ? Wrote it off to mashing too much together.

glad projectSHO89 got the correct info for you.