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DTC P0123 - Throttle Position (TP) Sensor

  1. Turn ignition on. Using scan tool, check TP sensor. If reading is approximately 10% with throttle fully closed and 90% with throttle fully opened, problem is intermittent. System is okay at this time. Check for poor connections or loose wires in TP circuit between TP sensor connector, and PCM connector. See WIRING DIAGRAMS  section.
  2. If reading is not approximately 10% with throttle fully closed and 90% with throttle fully opened, turn ignition off. Disconnect TP sensor connector. Turn ignition on. Measure voltage between TP sensor wiring harness connector terminals No. 1 (SG2) and 3 (VCC2). See Figure . If reading is approximately 5 volts, replace throttle body.
  3. If reading is not approximately 5 volts, measure voltage between PCM connector terminals D10 and D11. See Figure . If reading is approximately 5 volts, repair open in SG2 circuit between PCM connector and TP sensor. See WIRING DIAGRAMS  section. If reading is not approximately 5 volts, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.
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