Question about 2000 Jeep Grand Cherokee

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What are these codes po123 and po121 - 2000 Jeep Grand Cherokee

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These two codes are pointing at your TPS.
Your car may have a rough or high idle, or it could be surging or stumbling when accelerating and decelerating

The causes could be any of the following:
Your TPS may not be secured properly
You could have a short in the wiring to your TPS
The connectors to your TPS may be loose
Your TPS may be bad

Posted on Oct 06, 2009

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P0121 (M) - Accelerator Position Sensor (APPS)
APPS voltage input below the minimum acceptable voltage.

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.

Here can find more details about OBD (On-Board Diagnostic) systems.

I hope help you. Good luck (remember rated this help).


Posted on Oct 06, 2009

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Codes relate to improper voltages at throttle position sensor and map sensor. Do tests outlined in haynes or chiltons with a digital volt/ohmeter and compare what you have to readings in book. Both are information sensors and show common wiring.

Posted on Oct 06, 2009

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1 Answer

Cause for po121


code p0121 refers to throttle position (TP)switch A/ pedal position (AAP) switch A-range/performance problem===causes --accelerator cable adjustment--TP/APP switch
PO121 also refers to TP sensor A/ accelerator pedal position AAP switch A -range / performance problem===causes --accelerator cable adjustment. TP/AAP sensor --wiring
Cheapest first is to check the cable adjustment then the cheapest part after that .

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IAT Sensor Circuit High Input
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IAT Sensor signal circuit shorted to VREF (5v) IAT Sensor signal circuit is open, or the ground circuit is open


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TP Sensor/APPS Circuit High Input
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2000 Jeep Grand Cherokee Laredo PO123


I have ordered a reconditioned pcm for my Jeep. Once I have installed it I will get back to the forum and let you know if this fixed the problem

Thanks

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