tps adjustment

hey, ever since i got my head gaskets changed on my 97 q the transmitions shifing has been all crazy and out of wack, it was really bad at first and the 4x4 didnt even work anymore but i adjusted the tps a lil bit and that fixed that part, but it still shifts and cant deside between gears, is there a way to fine tune a tps?

anyone?

Here's the steps for a 97 pathfinder:

To adjust the throttle position sensor you'll just need a .012 and .016 feeler gauge and a multimeter.

Look at the throttle body and you'll see the throttle position sensor on the side with two electrical connections, the top is the closed throttle position switch and the bottom is the variable output throttle position sensor. To adjust the sensor you'll use the top one, the closed throttle position switch.

1. Warm up engine until the fast idle cam retracts and the throttle lever rests on the throttle stop screw (never adjust the stop screw)
2. Remove the electrical connection to the closed throttle position switch (top one on 97 Pathfinder)
3. You'll see 3 terminals, you will be testing for continuity across the top two (5 & 6)
4. Insert the .012 feeler gauge between the stop screw and the throttle drum stop, should have continuity 0 ohms
5. Insert the .016 feeler gauge and you should not have continuity
6. If readings are incorrect loosen the bolts and adjust the sensor (rotate) until the readings are correct

Before trying the above procedure try this
1.warm up engine completely
2.shut off
3.disconnect both tps connectors
4.start and idle engine{donot rev or code may set
5.shut off
6.reconnect both tps connectors
7.turn key on{donot start} then turn key off
8.repeat step 7, twenty{yes 20} times

What you are doing here is learning the ECM where idle stop is{closed throttle}.We use Consult and it is done first attempt.Doing it without Consult{above procedure},step 7 must be done 20 times to ensure the ECM accepts the closed throttle position into memory.Your transmission relies on this closed throttle input to determine many shift functions.Setting the closed throttle switch by rotating the tps does not program the ECM.Physically the switch is closed{by rotating}but the ecm must "learn" this.Theres only two ways it can learn.With consult {or gst} or the above procedure.
Lessons over.
Good luck

infinman, those are the specific steps laid out by Nissan in their revised TPS adjustment procedure as of January 2002. At the end of the steps it has you merely turn the ignition on (wait 5 seconds) and off (wait 10 seconds) and repeat 16 times to relearn the closed position. But Nissan's TSB still requires that you adjust the position of the TPS before this step. I haven't seen anything more recent than this revised procedure.