TPS Sensor and Auto Trans

btwilson86 · 02-07-2008, 08:05 AM

I've had a CEL for the Throttle Position Sensor for quite some time now, and I have finally checked the resistance values. After discovering that the readings are WAYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY off from what the TSRM says they should be, I attempted to recalibrate the sensor to no avail, and decided to remove it for further inspection. The rotating piece inside of the sensor housing does not move, and after destroying the sensor in order to see how it works, I found out that it should have been rotating with the throttle linkage (makes sense).

So I'm getting a used one from the junkyard tomorrow, but I have a question.

How important is this sensor to determining when the Auto transmission shifts? Ever since I have begun work on my 87 N/A Auto Supra, I've had sporadic shifting, and I believe that this may be the cause.

Anyone have any input on this subject?

02-07-2008, 08:05 AM	#1
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	TPS Sensor and Auto Trans I've had a CEL for the Throttle Position Sensor for quite some time now, and I have finally checked the resistance values. After discovering that the readings are WAYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY off from what the TSRM says they should be, I attempted to recalibrate the sensor to no avail, and decided to remove it for further inspection. The rotating piece inside of the sensor housing does not move, and after destroying the sensor in order to see how it works, I found out that it should have been rotating with the throttle linkage (makes sense). So I'm getting a used one from the junkyard tomorrow, but I have a question. How important is this sensor to determining when the Auto transmission shifts? Ever since I have begun work on my 87 N/A Auto Supra, I've had sporadic shifting, and I believe that this may be the cause. Anyone have any input on this subject? __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels