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TESTING

Fig. 1: Testing the SIG circuit to the TP sensor

Fig. 2: Testing the SIG RTN circuit of the TP sensor

Fig. 3: Testing the operation of the potentiometer inside the TP sensor while slowly opening the throttle

Fig. 4: The TP sensor can be monitored with an appropriate and Data-stream capable scan tool

  1. With the engine OFF and the ignition ON, check the voltage at the signal return circuit of the TP sensor by carefully backprobing the connector using a DVOM.
  2. Voltage should be between 0.2 and 1.4 volts at idle.
  3. Slowly move the throttle pulley to the Wide Open Throttle (WOT) position and watch the voltage on the DVOM. The voltage should slowly rise to slightly less than 4.8 volts at WOT.
  4. If no voltage is present, check the wiring harness for supply voltage (5.0 volts) and ground (0.3 volts or less), by referring to your corresponding wiring guide. If supply voltage and ground are present, but no output voltage from TP, replace the TP sensor. If supply voltage and ground do not meet specifications, make necessary repairs to the harness or PCM.

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