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Throttle Position Sensor Circuit Check

  1. Ensure ignition is off. Disconnect TCU harness connectors. See Figure . Turn ignition on. Using DVOM, measure voltage between terminals No. 3 and 7 of 14-pin connector. See Figure .
  2. While monitoring voltage, slowly depress accelerator pedal to wide open throttle (WOT). Voltage should increase from 0-12 volts. If voltage is not within specification, go to step 5). If voltage is within specification, go to next step.
  3. Measure voltage between terminals No. 3 and 8 of 14-pin connector. See Figure . While monitoring voltage, slowly depress accelerator pedal to wide open throttle (WOT). Voltage should increase from 0-12 volts, then decrease from 12-0 volts. If voltage is not within specification, go to step 5). If voltage is within specification, go to next step.
  4. Measure voltage between terminals No. 3 and 9 of 14-pin connector. See Figure . While monitoring voltage, slowly depress accelerator pedal to wide open throttle (WOT). Voltage should pulse twice from 0-12 volts, then decrease from 12-0 volts. If voltage is not within specification, go to next step. If voltage is within specification, system is okay.
  5. Inspect TCU and TPS harness connections. Using ohmmeter, check all circuits for continuity and short to ground. See appropriate wiring diagram in WIRING DIAGRAMS  . If all circuits are okay, see appropriate repair manual for further TPS diagnostic procedures.
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