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Home >> Isuzu >> 1999 >> Rodeo LS, 2.2 D >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Tests (2.2L) >> Diagnostic Trouble Code Identification >> DTC P0118: ECT Sensor Circuit High Input >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic II (OBD-II) system check. See SELF-DIAGNOSTICS - INTRODUCTION article. Go to next step.
  2. Turn ignition on. Using scan tool, read ENG COOL TEMP. If reading is less than -38°F (-37°C), go to step  4 . If reading is -38°F (-37°C) or greater, go to next step.
  3. Using scan tool, read and record FAILURE RECORDS data. Operate vehicle within conditions noted in FAILURE RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC P0118 FAILED THIS IGN, go to next step. If scan tool does not display DTC P0118 FAILED THIS IGN, see DIAGNOSTIC AIDS  .
  4. Disconnect ECT sensor harness connector. Using a jumper wire, connect ECT sensor connector terminals. Using scan tool, read ENG COOL TEMP. If temperature is 284°F (140°C), go to step  6 . If temperature is not as specified, go to next step.
  5. Connect jumper wire between chassis ground and ECT sensor harness connector sensor input circuit. Using scan tool, read ENG COOL TEMP. If reading is 284°F (140°C), go to step  7 . If reading is not as specified, go to step  8 .
  6. Check for faulty connection at ECT sensor. If faulty connection is found, repair as necessary. Retest system. If connection is okay, go to step  10 .
  7. Turn ignition off. Disconnect PCM connectors. Check ECT sensor ground circuit for an open. If open is found, repair as necessary. Retest system. If no open is found, go to step  9 .
  8. Turn ignition off. Disconnect PCM connectors. Check ECT sensor input circuit for an open. If open is found, repair as necessary. Retest system. If no open is found, go to next step.
  9. Check for faulty ECT sensor input or ground circuit connection at PCM. If problem is found, repair as necessary. Retest system. If no problem is found, go to step  11 .
  10. Replace ECT sensor. Retest system.
  11. Replace PCM. Program replacement PCM using required equipment. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. Retest system.
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