Throttle Position Sensor: Testing and Inspection

A broken or loose Throttle Position (TP) sensor may cause intermittent bursts of fuel from an injector and unstable idle because the PCM thinks the throttle is moving. A problem in the TP sensor 5 volts reference or signal circuits should set either a Diagnostic Trouble Code (DTC) P0122 or DTC P0123. A problem with the TP sensor ground circuit may set DTCs P0123 and P0117. Once a DTC is set, the PCM will use an artificial failsoft value for TP sensor and some vehicle performance will return. A high idle may result when either DTC P0122 or DTC P0123 is set. Testing and Inspection