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Home >> Suzuki >> 2002 >> Esteem GLX, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 1.8L >> Diagnostic Tests >> DTC P0122: Throttle Position Sensor Circuit - Low Input >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. If engine system check has been performed, go to next step. If engine system check has not been performed, go to A4: ENGINE SYSTEM CHECK  under SYSTEM TESTS.
  2. Turn ignition off. Connect scan tool. Turn ignition on. Observe throttle valve opening percentage on scan tool. If display reads zero percent, go to next step. If display reading is not zero percent, problem is probably intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  3. Turn ignition off. Disconnect TP sensor 3-pin harness connector. Check for poor terminal contact at TP sensor connector. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If no problem is found, go to next step.
  4. Turn ignition on. Measure voltage between ground and TP sensor harness connector terminals No. 2 (Gray wire) and No. 3 (Pink/Green wire), individually. If 4-6 volts are present at each terminal, go to step  7 . If 4-6 volts are not present at each terminal, go to next step.
  5. Check for short to ground in Pink/Green wire between TP sensor and ECM harness connector C20 terminal No. 18. See WIRING DIAGRAMS article. Check for short to each other between Pink/Green and Orange wires. Also check for short to ground in Gray wire between TP sensor and ECM harness connector C20 terminal No. 25. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If no problem is found, go to next step.
  6. Substitute a known good ECM, and repeat DTC CONFIRMATION TEST  . If DTC does not reset, testing is complete.
  7. Measure resistance between specified TP sensor terminals. See CHECKING THROTTLE POSITION SENSOR RESISTANCE  table. See Figure . If resistance is as specified, go to next step. If resistance is not as specified, replace TP sensor. After repair, repeat DTC CONFIRMATION TEST  .
    CHECKING THROTTLE POSITION SENSOR RESISTANCE

    Measure Between TP Sensor Terminals No. (1) Specification (K/Ohms)
    1 & 2 .1-6.5
    1 & 3 4-6
    (1) TP sensor voltage should change slowly and smoothly from low value to high valve as throttle is opened.
  8. Substitute a known good ECM, and repeat DTC CONFIRMATION TEST  . If DTC does not reset, testing is complete.
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