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Home >> Suzuki >> 2000 >> Vitara JS, 2D Utility, 1.6, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Tests >> Diagnostic Tests >> DTC P0122: Throttle Position (TP) Sensor Circuit Low Input
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DTC P0122: Throttle Position (TP) Sensor Circuit Low 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 zero percent, go to next step. If scan tool display changes smoothly 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 ground and Gray/Red wire at TP sensor harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If voltage is 4-6 volts, go to next step. If voltage is not as specified, Check for an open or short to ground in Gray/Red wire. Check for poor connection at PCM. Repair as necessary. If wire 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 not as specified, replace TP sensor and retest system. If TP sensor resistance is okay, check for an open or short to ground in Red/Green wire. Check for poor connection at PCM. Repair as necessary. If wire is okay, replace PCM and retest system.
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