P0123 - Throttle/Pedal Position Sensor A Circuit High
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P0123 - THROTTLE/PEDAL POSITION SENSOR A CIRCUIT HIGH
| For Vehicles With Electronic Throttle Control (ETC) | ||||
| Description: | The ETC throttle position (TP) sensor 1 circuit was flagged as a concern by the powertrain control module (PCM) indicating a high voltage. | |||
| Possible Causes: |
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| Diagnostic Aids: | Drive the vehicle, bring it to a stop, and turn the key to the OFF position. Start the vehicle and carry out the key on engine running (KOER) self-test at idle. Access the KOER DTCs on the scan tool. The TP1 signal is normally at a high voltage at closed throttle, and a lower voltage at wide open throttle (WOT) (opposite of TP2). A TP1 PID reading greater than 4.75 volts in key ON, engine OFF or key ON, engine running indicates a concern is present. | |||
| For All Others | ||||
| Description: | The TP sensor circuit is monitored by the PCM for a high TP rotation angle (or voltage) input through the comprehensive component monitor (CCM). The test fails if the TP rotation angle (or voltage) changes above the maximum calibrated limit. | |||
| Possible Causes: |
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| Diagnostic Aids: | A TP PID reading greater than 93% (4.65 volts) in key ON, engine OFF or key ON, engine running indicates a concern is present. | |||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory | |
| Vehicles With Electronic Throttle Control (ETC) | refer to PINPOINT TEST DV . | |||
| All others | refer to PINPOINT TEST DH . | |||