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Throttle Position (TP) Sensor Circuit Test

  1. Ensure ignition is off. Disconnect TCM harness connectors. Turn ignition on. Using a DVOM, measure voltage between TCM 14-pin harness connector terminals No. 3 (Black/White wire) and No. 7 (Brown/Yellow wire). See Figure. Go to next step.
  2. While monitoring voltage, slowly depress accelerator pedal to Wide Open Throttle (WOT). If voltage increases from zero to 12 volts, go to next step. If voltage is not as specified, go to step 5).
  3. Measure voltage between TCM 14-pin harness connector terminals No. 3 (Black/White wire), and No. 8 (Brown/Black wire) See Figure. While monitoring voltage, slowly depress accelerator pedal to WOT. If voltage increases from zero to 12 volts, then decreases back to zero, go to next step. If voltage is not as specified, go to step 5).
  4. Measure voltage between TCM 14-pin harness connector terminals No. 3 (Black/White wire), and No. 9 (Brown/Red wire). See Figure. While monitoring voltage, slowly depress accelerator pedal to WOT. If voltage pulses twice from zero to 12 volts, then decreases back to zero, system tests normal at this time. If voltage is not as specified, go to next step.
  5. Inspect TCM, PCM and TP sensor harness connections. Using a DVOM, check all circuits for continuity and/or shorts to ground. See appropriate wiring diagram in WIRING DIAGRAMS . If all circuits are okay, see appropriate article in ENGINE PERFORMANCE for further TP sensor diagnostic procedures.
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