Jeep Wrangler Driveability

Tony Technician Oceanside, California Posted   Latest   Edited  
2000 Jeep Wrangler SE 2.5L 5-spd
P0123 - Throttle/Pedal Position Sensor/Switch "A" Circuit High
P0121 - Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance
Airbag Light Illuminated

Hey guys! Any help or previous experiences you guys might have had regarding this issue would be appreciated. Vehicle starts normally..idles great at proper unusual fuel control. Manually tested TPS sensor and all is good. Put vehicle in gear and start accelarating..let off accelerator before transmission goes into 2nd gear and engine cuts off. If you feather the accel. you can keep the engine running. Same in Reverse. After clearing codes due to wanting to see if codes returned- problem was now gone! Any inputs??Thanks 

Randy Diagnostician
Glendora, California
Randy Default

Do a deep relearn by disconnecting battery cables and draining ecm

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Tim Technician
Wailuku, Hawaii
Tim Default

I remember some of the older Jeeps would have this code set by a clock spring. They shared a common ground.

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Spencer Owner/Technician
Jeffersonville, Pennsylvania
Spencer Default


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Tony Technician
Oceanside, California
Tony Default

Thanks Tim for the input. 👍 Will be scoping TPS for any unwanted voltage spikes in the morning.

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Caleb Diagnostician
Mishawaka, Indiana
Caleb Default

Are you saying the problem is gone or its still there? If still present put a 4 channel scope on the circuit. Channel 1: TPS Ref Voltage at TPS. Channel 2: TPS Signal at TPS Channel 3: TPS Grd at TPS Channel 4: TPS Signal at PCM. Connect all these and go for a test drive. I am sure you will find it rather quickly this way!

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Tony Technician
Oceanside, California
Tony Default

For now its gone​.​That will be my next plan of attack. Going off some factory info. the TPS may experience a unwanted increase supply of voltage from a shorted clockspring. Will hook up scope and take it for a run. Thanks Caleb.

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Tony Technician
Oceanside, California
Tony Resolution

To end this discussion..the TPS was receiving a unwanted voltage feed from the the clockspring..making the PCM think that the TPS was over voltage but in reality it wasn't since they all shared a common ground​.​The fix was to delete that feed wire into the PCM or replace clockspring. Customer agreed to delete wire from PCM for the moment. Tested vehicle and verified concern after…

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