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DTC P0123: Throttle Position (TP) Circuit High Input

  1. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Observe throttle valve opening percentage on scan tool while slowly opening throttle valve to fully open position. If display increases to 96 percent or greater, go to next step. If display reading is less than 96 percent, check for an intermittent problem. See TESTS W/O CODES article.
  2. Turn ignition off. Disconnect TP sensor harness connector. Turn ignition on. Measure voltage between ground and Pink/Green wire at TP sensor harness connector. Reading should be 4-6 volts. If reading is as specified, go to next step. If reading is not as specified, check Pink/Green wire for short to voltage and retest system. If wire is okay, go to next step.
  3. Measure voltage between ground and Gray wire at TP sensor harness connector. Reading should be 4-6 volts. If reading is as specified, go to next step. If reading is not as specified, check Gray wire for an open. If wire is okay, replace PCM and retest system.
  4. Measure resistance between specified TP sensor terminals. See Figure . See TP SENSOR RESISTANCE  table. If resistance is not as specified, replace TP sensor. If resistance is as specified, check Green/Red wire for an open. If wire is okay, replace PCM. Retest system.
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