Diagnostic Aids

TP sensor voltage should increase smoothly as the accelerator pedal is applied. If an intermittent is suspected, check terminal tension at TP sensor and TCM. Also, use snapshot mode on scan tester to trigger on this DTC.

Fig 1: DTCS 21/22 Schematic (4L80-E With TCM) Throttle Position (TP) Sensor Circuit High/Low

Fig 2: DTCS 21/22 Flow Chart (4L80-E With TCM) Throttle Position (TP) Sensor Circuit High/Low