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Home >> Suzuki >> 2000 >> Vitara JS, 4D Utility, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Tests >> Diagnostic Tests >> DTC P0123: Throttle Position (TP) Sensor Circuit High Input
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DTC P0123: Throttle Position (TP) Sensor Circuit High Input

  1. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Select TP sensor parameter on scan tool. Observe scan tool display while depressing accelerator pedal to full throttle position. If scan tool display remains at 100 percent, go to next step. If scan tool display changes from zero to 100 percent, check for an intermittent problem. See TROUBLE SHOOTING - NO CODES article.
  2. Turn ignition off. Disconnect TP sensor harness connector. Turn ignition on. Using DVOM, measure voltage between Gray/Yellow and Gray/Red wires at TP sensor harness connector. If voltage is 4-6 volts, go to next step. If voltage is not as specified, inspect Gray/Red wire between TP sensor and PCM for short to power. Also check Gray/Yellow wire for open circuit or poor connection at PCM. Repair as necessary. If wiring is okay, replace PCM and retest system.
  3. Test TP sensor resistance. See ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. If TP sensor resistance is okay, check Red/Green wire between TP sensor and PCM for short to power. If wire is okay, replace PCM and retest system. If TP sensor resistance is not as specified, replace TP sensor.
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