jmkoons
Probationary Member
- 29
- 0
- Feb 16, 2006
-
Santa Barbara,
California
I've run into this problem with my car as well:
http://www.dsmtuners.com/forums/tun...5-s-afc-throttle-position-sensor-voltage.html
However, my problem differs slightly in that both Datalogger and SAFC incorrectly read the TPS as full open, in spite of a functioning TPS unit.
Important to note that my SAFC has been connected for a good number of years, has controlled and read back sensor values correctly until very recently.
I've checked the TPS without the wiring harness connected and resistances between pins 1-4 and 2-4 are correct, and throttle position affects signal values continuously as it should. Issue seems to be with wiring or ECU itself. When I disconnect the harness at the TPS, the signal reading at SAFC and Datalogger both drop to 0%.
The signal problem came up suddenly on its own as I was troubleshooting an unstable idle during attempted smog testing. With any luck, the unstable idle is related to this faulty TPS signal, which went from intermittent to complete failure, so if I solve this I should be clear in getting it through smog check. I'm hoping to find something that has come loose or shunted within the splicing at the ECU harness, which I will check next. I had the ECU out a few weeks ago to check it and replace capacitors. Unit went back in and car ran fine for a while.
As the original thread wasn't listed as resolved, I'm looking for any others who ran into this problem - nonvarying 100% throttle signal, which was not due to a bad TPS. I don't have permission to post outside of newbie forums yet, so I couldn't reply to that thread. Thanks in advance for comments.
http://www.dsmtuners.com/forums/tun...5-s-afc-throttle-position-sensor-voltage.html
However, my problem differs slightly in that both Datalogger and SAFC incorrectly read the TPS as full open, in spite of a functioning TPS unit.
Important to note that my SAFC has been connected for a good number of years, has controlled and read back sensor values correctly until very recently.
I've checked the TPS without the wiring harness connected and resistances between pins 1-4 and 2-4 are correct, and throttle position affects signal values continuously as it should. Issue seems to be with wiring or ECU itself. When I disconnect the harness at the TPS, the signal reading at SAFC and Datalogger both drop to 0%.
The signal problem came up suddenly on its own as I was troubleshooting an unstable idle during attempted smog testing. With any luck, the unstable idle is related to this faulty TPS signal, which went from intermittent to complete failure, so if I solve this I should be clear in getting it through smog check. I'm hoping to find something that has come loose or shunted within the splicing at the ECU harness, which I will check next. I had the ECU out a few weeks ago to check it and replace capacitors. Unit went back in and car ran fine for a while.
As the original thread wasn't listed as resolved, I'm looking for any others who ran into this problem - nonvarying 100% throttle signal, which was not due to a bad TPS. I don't have permission to post outside of newbie forums yet, so I couldn't reply to that thread. Thanks in advance for comments.