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Home >> Suzuki >> 2001 >> Esteem GL, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Esteem 1.6L >> Diagnostic Tests >> DTC P0122: Throttle Position Sensor Circuit Low Input >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

NOTE: If DTC P1700 is also set, clear Transmission Control Module (TCM) DTCs after completing repair.
  1. Perform DTC CONFIRMATION TEST  . If DTC P0122 is set, go to next step. If DTC P0122 is not set, problem is intermittent. System is okay at this time. See TROUBLE SHOOTING - NO CODES article.
  2. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0107, P0122 and P0450 are set, check for an open in Pink wire between ECM 16-pin connector C20 terminal No. 1 and TP sensor connector terminal No. 2. See Figure . See WIRING DIAGRAMS article. Repair as necessary and go to DTC CONFIRMATION TEST  . If DTC P0107, P0122 and P0450 are not present and/or Pink wire is okay, go to next step.
  3. Turn ignition on. Using scan tool, observe throttle valve opening percentage parameter. If parameter reads 2 percent or less, go to next step. If parameter reads more than 2 percent, problem is intermittent. System is okay at this time. See TROUBLE SHOOTING - NO CODES article.
  4. 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 ground and TP sensor harness connector terminal No. 2 (Pink wire) and No. 3 (Gray wire), individually. See WIRING DIAGRAMS article. If voltage is 4-6 volts at each wire, go to step  7 . If voltage is not 4-6 volts at either wire, go to next step.
  5. Turn ignition off. Disconnect ECM 16-pin connector C20. Check for poor terminal contact at ECM 16-pin connector C20. If poor terminal contact is found, repair as necessary and go to DTC CONFIRMATION TEST  . If terminal contact is okay, check for open or short to ground in Pink wire between TP sensor connector and ECM 16-pin connector C20 terminal No. 1. See Figure . Go to next step.
  6. Also check for short to ground in Gray and Green/Red wire between TP sensor connector and ECM 16-pin connector C20 terminals No. 6 and No. 9. See WIRING DIAGRAMS article. Repair as necessary and go to DTC CONFIRMATION TEST  .
  7. Measure resistance between specified TP sensor terminals as illustrated. See Figure . Resistance between terminals No. 1 and No. 2 should be 2.5-6 ohms and between terminals No. 1 and No. 3 should be 100-20,000 ohms (depending on throttle angle). If resistance is not as specified, replace TP sensor and go to DTC CONFIRMATION TEST  . If resistance is as specified, replace ECM and go to DTC CONFIRMATION TEST  .
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