I'm remembering some of the electrical issues I've had in the past realizing they must be related to my current issue. Recently, I' m having the 5volts on the tps signal return issue. I just started working on my car again after years of sitting. I have aem ems and have been messing around with it off an on in anticipation off putting my supercharged motor back in the car, currently running a stock 92 5.0. Just got it up and running the other day after a bad ecm relay. With the aem computer, I have a high idle of 1400 and the tps voltage shows 4.9v ,wot. with a A9l, car runs ok but low crappy idle. I probed tps and the harness, and even without the sensor I have 4.9v on two of the three wires. I found a bad ground where the ecc harness grounds to to the pass kick panel. I fixed and now have 0 oms across the ground pins to the car body, but only when the ignition is off. When the key is on resistance goes up over 20. Im guessing it wasnt the problem. short circuit? Any way, sure enough with computer connected, koeo, pin 46 shows voltage. That goes for both an A9L and the aem. Last time i messed with the car a few years ago i didn't have this problem. I was running the stock motor with aem for purposes of learning the aem software. tps and other sensors worked fine.
in another post it mentions the problems with using the 5sp computer on Auto cars. This car was a 4cyl auto to V8 tremec swap. In the past i had weird issues with the the starter triggering when in reverse, and clutch pedal causing a drop in idle. I cant remember what I did to fix that problem, but I definitely had some serious back feeding, or shorting issues. i must have just unhooked something. I also remember my diagnostic ports not working correctly. All the while tps and other sensor parameters were fine according to the feedback from aem ems. The clutch or neutralSS connections and the signal return thing has got to be my problem.. reading other posts, It seems like all the pieces to the puzzle are mentioned at various times, I just haven't grasped them yet. Not sure what to do next? cut wire to pin 30? Unplug the clutch pedal sensor? I think the neutral safety switch is currently disconnected, but the clutch pedal sensor is active. Did i blow out the ecm tracing to pin 46 on the A9L? I wonder if the aem is damaged? I dont remember there being a distinction between 5sp and auto part numbers. some people make jumper to ground at TPS. I know its not ideal, but would grounding pin 46 help? thanks
in another post it mentions the problems with using the 5sp computer on Auto cars. This car was a 4cyl auto to V8 tremec swap. In the past i had weird issues with the the starter triggering when in reverse, and clutch pedal causing a drop in idle. I cant remember what I did to fix that problem, but I definitely had some serious back feeding, or shorting issues. i must have just unhooked something. I also remember my diagnostic ports not working correctly. All the while tps and other sensor parameters were fine according to the feedback from aem ems. The clutch or neutralSS connections and the signal return thing has got to be my problem.. reading other posts, It seems like all the pieces to the puzzle are mentioned at various times, I just haven't grasped them yet. Not sure what to do next? cut wire to pin 30? Unplug the clutch pedal sensor? I think the neutral safety switch is currently disconnected, but the clutch pedal sensor is active. Did i blow out the ecm tracing to pin 46 on the A9L? I wonder if the aem is damaged? I dont remember there being a distinction between 5sp and auto part numbers. some people make jumper to ground at TPS. I know its not ideal, but would grounding pin 46 help? thanks