throtle position sensor and speed sensors fault codes

[baronb55]

Can anyone give me pointers on how to remove and replace the throtle position sensor on a 1999 996? Is there only one sensor? Any particualr procedure afetr the new one is replaced? Also, I just changed the rotors and pads (I disconnected and tie-wrapped the pad sensors) and have a fault on the Durametrics showing the speed sensors of both rear wheeels and the front passenger wheel as defective. This was not present before I changed the pads. i did not touch the speed sensors. Any clues?

[Richard Hamilton]

I assume it is a '99 C2 (mechanical throttle). The throttle position sensor is held onto the side of the throttle body with 2 screws. As far as I know there isn't any special procedure or setup.

Are you sure you didn't disturb one of the ABS sensors when you disconnected the brake wear sensors? The plugs are next to each other.

Front:

Rear:

Edited August 4, 2011 by Richard Hamilton

[baronb55]

I assume it is a '99 C2 (mechanical throttle). The throttle position sensor is held onto the side of the throttle body with 2 screws. As far as I know there isn't any special procedure or setup.

Are you sure you didn't disturb one of the ABS sensors when you disconnected the brake wear sensors? The plugs are next to each other.

Front:

Rear:

100% sure....not. The only thing I did was unplug the pad sensors and tie wrap them without tension away from the suspension and rotors. I will check and make sure the connections are OK. I did change the oil with the car still in the stands. Two of the calipers (the back ones) still don't have the pads because I am still waiting for teh vibration dampers. Accidentally, I touched the brake pedal when I started the engine after the oil change and this is when the ABS light came on. When I plugged the Durametrics, I found all these carzy fault codes including the one for the throtle position sensor. I installede cat bypasses and since then the check engine light has been on. The throtle fault could have been there for a while before the ABS light came on. You think that touching the brake pedal with no pads on 2 calipers could have triggered the speed sensor faults?

[Loren]

If the battery was disconnected then there might be an ABS light for the first few miles after reconnecting - not uncommon.

I would do a short test drive (5 miles or so) and then clear the codes and re-test.

[berny]

If the battery was disconnected then there might be an ABS light for the first few miles after reconnecting - not uncommon.

I would do a short test drive (5 miles or so) and then clear the codes and re-test.

If you started the engine with the car on stands the wheels or hubs would most likely have turned at diffent speeds! this would trigger the ABS light. As Loren has said do a test drive should clear quite quickley

[baronb55]

If the battery was disconnected then there might be an ABS light for the first few miles after reconnecting - not uncommon.

I would do a short test drive (5 miles or so) and then clear the codes and re-test.

If you started the engine with the car on stands the wheels or hubs would most likely have turned at diffent speeds! this would trigger the ABS light. As Loren has said do a test drive should clear quite quickley

Berny and Loren, thanks for your help. I checked all connections and everything is tight. Will ride it for a FEW miles and check again. I already reset the faults.

[baronb55]

I assume it is a '99 C2 (mechanical throttle). The throttle position sensor is held onto the side of the throttle body with 2 screws. As far as I know there isn't any special procedure or setup.

Are you sure you didn't disturb one of the ABS sensors when you disconnected the brake wear sensors? The plugs are next to each other.

Front:

Rear:

100% sure....not. The only thing I did was unplug the pad sensors and tie wrap them without tension away from the suspension and rotors. I will check and make sure the connections are OK. I did change the oil with the car still in the stands. Two of the calipers (the back ones) still don't have the pads because I am still waiting for teh vibration dampers. Accidentally, I touched the brake pedal when I started the engine after the oil change and this is when the ABS light came on. When I plugged the Durametrics, I found all these carzy fault codes including the one for the throtle position sensor. I installede cat bypasses and since then the check engine light has been on. The throtle fault could have been there for a while before the ABS light came on. You think that touching the brake pedal with no pads on 2 calipers could have triggered the speed sensor faults?

Anorak, thank you very much for your help and the pics. Turns out that after running the cr everything was fine and the ABS light went off.

[baronb55]

I assume it is a '99 C2 (mechanical throttle). The throttle position sensor is held onto the side of the throttle body with 2 screws. As far as I know there isn't any special procedure or setup.

Are you sure you didn't disturb one of the ABS sensors when you disconnected the brake wear sensors? The plugs are next to each other.

Front:

Rear:

Thank you for your help RIchard. The pics were very useful. Problem has been solved