Isuzu Trooper Owners Club UK™

MartQ · Posted: Sat Dec 30, 2006 4:59 Post subject: Loss of Overdrive when warm

My 94 3.1 Big Horn loses overdrive when warm.

This happened a coule of months ago and it appeared to be the throttle position sensor.

With it disconnected, overdrive worked fine, but I lost kickdown.

I replaced it with one from a scrappy (Isuzu wont sell them without a complete throttle body) and the car worked better than ever.

A couple of days ago it happened again.

It only happens when it is warm. When cold, it goes into overdrive no problem.

When I short the pins for the fault codes, it flashes 21 (TPS) and 24 (VSS) but I have a feeling that this is from the earlier fault. Is there any way of deleting the stored codes so that I can obtain a new fault report?

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siweb · ******* Joined: 18 Apr 2004 Posts: 1590

from what i can remember they either a different plug you use to read auto box faults or you cross different pins in the odbe plug.

what pins have you crossed??
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MartQ · Posted: Sat Dec 30, 2006 19:30 Post subject:

The plug is the little green 3 pin one behind the side cover of the centre console. To display the fault codes on the check trans light, you have to short pins A and C. When you turn the ignition on, this then flashes the fault codes on the check trans light.

What I need to know is how to clear the stored codes so that I can be sure I am not looking at previously reported faults.

siweb · ******* Joined: 18 Apr 2004 Posts: 1590

by disconnecting the battery for at least 30 seconds i was told. but make your theys no other power source anywhere i.e alarm backup.

I did this but was no help Rolling Eyes

so weather I have another prob somewhere I don't know. let me know how you get on.

MartQ · Posted: Sun Dec 31, 2006 3:07 Post subject:

OK I suppose I'll have to give it a go. I just wondered if there was another way as my CD player is a pain to re-programme.

I'll let you know what happens.

Thanks,

MartQ