97 Jeep Cherokee p0123

P0123 Cleaned TPS and conntectors Treated with Seafoam

Wont shift into overdrive, runs smooth, starts fine.

Please contact me if you have suggestions.

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partsmore
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P0123 (M) Throttle/Pedal Position Sensor/Switch A Circuit Intermittent Throttle position sensor input above the maximum acceptable voltage. Follow all appropriate diagnostics for the fault that is present. Prior to replacing parts, check all connectors between the speed control switch and the PCM for moisture Internally the PCM uses the same A/D (analog to digital) converter for TPS voltage as it does for the speed control switch sense. If the v-37 circuit has voltage bleed over from another source, a code of TPS Shorted to voltage may be set in the PCM. The DN model equipped with rear heat option, has an external water pump to circulate coolant to the rear heater. If you find coolant in the bulkhead connector, the likely cause would be a leaking coolant pump. Pump should be replaced if found leaking. If the code sets when the A/C is turned on go right to the bulk head connector and check for moisture. Check for a shorted clock spring causing the speed control 5 volt feed to be shorted to power. It's not also something simple the switch on the dash that limits the shift points for pulling a trailer, is it? AW4 Jeep Diagnoses:

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L.W. (Bill) Hughes III

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Danger, Will Robinson!

Hughes Link approaching.

Beware! Beware!

Reply to
Shirley U. Jeste

We checked and cleaned all connectors also yesterday, still have light and code - unable to erase?

Reply to
partsmore

Disconnect the battery for a while to erase codes.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's - Gone to the rust pile... Canadian Off Road Trips Photos: Non members can still view! Jan/06
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Reply to
Mike Romain

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