ddlanes21 Posted March 23 Share Posted March 23 So I just did the C101 delete the other day on my 88 4.0 and was attempting to adjust the TPS this morning. When checking the input voltage for 5V I am getting only 20mv. Is there a way to check the reference voltage in another place? I know the 5v comes from the ecu but where do i probe it? Link to comment Share on other sites More sharing options...
89 MJ Posted March 23 Share Posted March 23 Make sure you are using this procedure: Link to comment Share on other sites More sharing options...
ddlanes21 Posted March 23 Author Share Posted March 23 Yes I am using that procedure. Is there another test point somewhere from the ecu to the sensor or do i need to trace the wire back to the computer. Link to comment Share on other sites More sharing options...
llhat Posted March 23 Share Posted March 23 ? did it run after the c101 delete? How well or how bad? one would think with that low voltage, the ecu would not 'respond'.... Possibly a bad back probe connection... I ran into this with testing the transmission solenoids for resistance at the connector... You're probably going to need the complete wiring data to trace to the pin-out on the ECU connector or re-test at the TPS connector by back probing ...with the connector still connected to CPS... Link to comment Share on other sites More sharing options...
ddlanes21 Posted March 24 Author Share Posted March 24 It runs about the same after the delete. I did notice when hand actuating the throttle it was pretty delayed response on the engine. I was able to backprobe the MAP sensor just fine so I am pretty confident that I'm doing it right. I’ll probably end up trying to test the output voltage from the ECU. Link to comment Share on other sites More sharing options...
llhat Posted March 24 Share Posted March 24 ok, another thought, I believe the is a 'tip' on upgrading the ground wire on the TPS wire bundle.... maybe search will find it. otherwise ground you multimeter negative, then probe ( from memory "A" wire on connector for the voltage with your multimeter positive, I'd think if you get the reference voltage, then the ground circuit in that bundle could be the issue. at one point I believe the 88 electrical manual was posted here as a PDF file, you may can find the pin out for first, the supply wire on the C101 connector (that 'may' be the source of issue during that procedure) then trace back to the ECU connector. I am unsure just who posted that link to the manual, but 1988 was last year for C101 connector. Link to comment Share on other sites More sharing options...
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