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Home >> Suzuki >> 2001 >> Vitara JS, 4D Utility, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0123: Throttle Position (TP) Sensor Circuit, High Input >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Perform DTC CONFIRMATION TEST . If DTC P0123 is set, go to next step. If DTC P0123 is not set, problem is intermittent. System is okay at this time. See TROUBLE SHOOTING - NO CODES article.
  2. Turn ignition off. Connect scan tool. Turn ignition on. Select TP sensor parameter on scan tool. Observe scan tool display while depressing accelerator pedal to full open throttle position. If scan tool display remains at 100 percent, go to next step. If scan tool display does not remain at 100 percent, problem is intermittent. System is okay at this time. See TROUBLE SHOOTING - NO CODES article.
  3. Turn ignition off. Disconnect TP sensor connector. Check for poor terminal contact at TP sensor connector. If poor terminal contact is found, repair as necessary and go to DTC CONFIRMATION TEST . If terminal contact is okay, turn ignition on. Measure voltage between TP sensor harness connector Gray/Red wire and Gray/Yellow wire terminals. See WIRING DIAGRAMS article. If reading is 4-6 volts, go to step  5. If reading is not 4-6 volts, go to next step.
  4. Check for a short to power in Gray/Red wire between PCM 26-pin connector C51-3 terminal No. 13 and TP sensor. If wire is okay, check for open in Gray/Yellow wire between PCM 26-pin connector C51-3 terminal No. 21 and TP sensor. If wires are okay, disconnect PCM 26-pin connector C51-3. Check for poor terminal contact at PCM 26-pin connector C51-3. If poor terminal contact is found, repair as necessary and go to DTC CONFIRMATION TEST . If terminal contact is okay, replace PCM and go to DTC CONFIRMATION TEST .
  5. Check TP sensor operation. See SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. Replace as necessary. If TP sensor operation is okay, check for short to power in Red/Green wire between TP sensor and PCM 26-pin connector C51-3 terminal No. 9. See WIRING DIAGRAMS article. If wire is okay, replace PCM and go to DTC CONFIRMATION TEST .
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