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Home >> Suzuki >> 2001 >> Esteem GLX, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Esteem 1.6L >> Diagnostic Tests >> DTC P0118: Engine Coolant Temperature Sensor Circuit High Input >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

NOTE: If DTC P1705 is also set, clear Transmission Control Module (TCM) DTCs after completing repair.
  1. Perform DTC CONFIRMATION TEST  . If DTC P0118 is set, go to next step. If DTC P0118 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 P0108, P0113, P0118, P0123 and P0450 are set, check for an open in Green/Red wire between ECM 16-pin connector C20 terminal No. 9 and ECT sensor connector terminal No. 3. See Figure . See WIRING DIAGRAMS article. Repair as necessary. If DTC P0108, P0113, P0118, P0123 and P0450 are not present and/or Green/Red wire is okay, go to next step.
  3. Turn ignition on. Using scan tool, select ECT parameter. If parameter reads -40°F (-40°C), go to next step. If parameter does not read -40°F (-40°C), problem is intermittent. System is okay at this time. See TROUBLE SHOOTING - NO CODES article.
  4. Turn ignition off. Disconnect ECT sensor connector. ECT sensor is located in thermostat housing. Check for poor terminal contact at ECT 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 ECT sensor harness connector terminal No. 3 (Green/Red wire). See WIRING DIAGRAMS article. Go to next step.
  5. If 4-6 volts are present, go to step  7 . If 4-6 volts are not present, 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, go to next step.
  6. Check for open or short to power in Light Green/Red wire between ECT sensor harness connector terminal No. 1 and ECM 16-pin harness connector C20 terminal No. 10. See Figure . See WIRING DIAGRAMS article. Repair as necessary and go to DTC CONFIRMATION TEST  . If wire is okay, replace ECM and go to DTC CONFIRMATION TEST  .
  7. Using a fused jumper wire, jumper together ECT sensor harness connector terminal No. 1 (Light Green/Red wire) and No. 3 (Green/Red wire). See WIRING DIAGRAMS article. Turn ignition on. If parameter on scan tool reads 246°F (119°C), replace ECT sensor and go to DTC CONFIRMATION TEST  . If parameter is not 246°F (119°C), check for poor terminal contact at ECM 16-pin connector C20. Go to next step.
  8. If poor terminal contact is found, repair as necessary and go to DTC CONFIRMATION TEST  . If terminal contact is okay, check for open in Green/Red wire between ECT sensor harness connector terminal No. 3 and ECM 16-pin harness connector C20 terminal No. 9. See Figure . Repair as necessary. If wire is okay replace ECM and go to DTC CONFIRMATION TEST  .
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