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4.9l TPS replacement?

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I have a 95 DeVille that needs a new TPS. Can anyone tell me how to go about replacing the thing? Also is there a calibration procedure for the new part? Pictures of the location of parts would be very helpful. Its very cold out and I would like to get this done as quickly as possible: ) Thanks guys.

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The TPS, or throttle position sensor, on teh 4.9L is attached to the throttle, with a wire coming out of the top of a flat side portion.

The center section is shaped like a "P" on its side. It is on the opposite side of the throttle body from the Idle speed control or the actual throttle cable/control.

It is near a vacuum pipe fitting for the brake booster.

It is attached with two screws, with a retainer (washer/support).

To remove:

1) air cleaner

2) electrical connector

3) two TPS attaching screws and retainers.

4) throttle position sensor

TPS Adjustment:

1. enter diagnostics and select PCM Override ES02 "ISC Motor"

2. press the Cooler button on the ccdic to retract the isc motor. The climate control center display will change from 50 to 00. THe isc motor will slowly retract (about 20 seconds) to a fully retracted position. Verify that the throttle lever is resting on the minimum idle speed screw. With ISC plunger fully retracted, disconnect ISC harness.

3. with isc fully retracted, the plunger should not be touching the throttle lever. The throttle lever must be resting on the minimum air screw. Make sure that hte throttle is not being bound by the throttle, cruise, or TV cables. Readjust or repair cables causing throttle to bind.

4. Select PCM data ed01, TPS while still in PCM override ES03. Note the throttle position (in degrees) displayed on PCM parameter ED01

-0.5 degrees to +0.5 degrees go to step 6

-10 degrees to -.6 degrees or top +.6 degrees to 90 degrees go to stop 5.

5. using a T-25 L-shape torx wrench, loose the TPS screw just enough to permit the sensor to be rotated. Open the throttle slightly and allow the throttle lever to snap shut against the minimum air screw. Adjust the TPS so the parameter display is zero degrees. Tighten the TPS mounting screws with the sensor in the adjusted position. Recheck the parameter to be sure the parameter is -0.5 degrees to +0.5 degrees.

IMPORTANT: do nto sue excessive force to adjust the TPS or damage to the TPS or throttleshaft binding may occur. The TPS mounting screws must be loosened to perform the adjustment.

6. Reconnect ISC harness. Start the engine and check for proper ISC motor operation.


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Chief Engineer, Scotty (God rest his soul), posted the TB, TPS, ISC and Minimum Air procedure here:


See Posts #9 and #10, #9 is a little hard to read but if you expand it and save it to your hard drive and view it with a picture viewer you should be able to read it fine.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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