TPS failure?

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11-22-2012, 11:09 PM

antipode

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Join Date: Sep 2012

Location: Massachusetts

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Year: 1999

Model: Cherokee

Engine: 4.0

TPS failure?

On the highway while decelerating I threw code P0123, labelled as:
Throttle/Pedal Position Sensor/Switch A Circuit High Input

I'll have to check it out in the daylight, but my idle is smooth and at normal RPM, no surging or anything so I'm leaning towards a wiring problem since I've tried clearing the code and it comes back immediately.

Any thoughts?

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11-23-2012, 10:26 AM

weebur

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Year: 1997

Model: Cherokee

Engine: 4.0L

I'd still test the TPS.

Pasted from my notes ('97):
Throttle Position Sensor
Center lead-back probed/Key On-Engine/Off
IDLE: Greater than .350v. Less than .900v
WOT: Less than 4.5v

Mine
IDLE: .979v (out of specification by .079v)
WOT: 4.11v
Voltage Swing: Smooth with analog meter

Use a digital meter to record voltage and an analog meter for the smoothness of swing from closed throttle plate to WOT, both meters grounded at the negative terminal of the battery.