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Engine light came on P0123
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Author:  SA Jeepie [ Thu Jun 18, 2009 10:25 am ]
Post subject:  Engine light came on P0123
Good day,

My KJ 3.7Ltd engine light came on while driving on tar at a steady 40kph.

This happened about a week ago and the next morning when I started the vehicle the light went off again and everything was fine until today.

It came on with some rough idle and it stayed on. The OBD code is P0123 and refers to the throttle position sensor (TPS). Problem is; I don’t know where this sensor is located.

1. On the throttle body are two plugs. Which plug connects to the TPS the top or the bottom one?

2. Any suggestions on how to test the sensor or what the readings must be on the plug going back to the controller (once I can allocate it)?

Author:  Edvalencia [ Thu Jun 18, 2009 8:21 pm ]
Post subject: 
I'll check when I get home tonight.
That part is very easy to change (about 5 minutes) and you can pick it up at your local auto parts store for around $35.


EDIT: Ok, I just noticed that you're in South Africa, so I don't know what the cost will be in your neck of the woods.
Author:  SA Jeepie [ Fri Jun 19, 2009 8:47 am ]
Post subject: 
Thanks Edvalencia :)

Everything was normal again this morning when I drove to work.

When stoped at work, I’ve checked all the plugs around the throttle body. While juggling the wires that went to the sensors on the throttle body the Jeep started again with its rough idling and on went the engine light. :roll: It seems that it must be a loose connection or bad wire but I could not tell which one, since all the wires move along with the harness as you try moving one.

It will help a lot if I know were the TPS is :!:

Does anyone know how to test the TPS or perhaps what voltage or current must flow in which wires (once one knows which wires went to it)?
Are there ways of testing the output on the plug once you unplug it :?:
Author:  Edvalencia [ Fri Jun 19, 2009 11:32 am ]
Post subject: 
The Throttle Position Sensor is the top plug. The bottom plug is the Idle Air Control Motor.

The sensor looks like this:
Image

I don't know hot to test it, but I believe it's a sealed unit, so you can't service it.

When it starts to go bad, the engine will run fine, then start to act up. The engine revs up, down or stalls. Even if you disconnect the battery, the light CEL will disappear and the Jeep may seem to run fine for a short while, but the problem will return.

As I said, it's very easy to change. Just unplug the wires, remove the two screws and it's out.

Good luck.
Author:  SA Jeepie [ Tue Jun 23, 2009 8:10 am ]
Post subject: 
Many thanks for your assistance. It helped a lot.

Regards
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