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Home >> Isuzu >> 2001 >> Rodeo S, 2.2 D, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.2L >> Diagnostic Tests >> DTC P0118: ECT Sensor Circuit High Input >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform OBD-II system check. See ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK  . After performing OBD-II system check, go to next step.
  2. Turn ignition on. Using scan tool, read ENG COOL TEMP display. If reading is less than -38°F (-39°C), go to step  4 . If reading is -38°F (-39°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, monitor specified DTC parameters. If scan tool displays DTC P0118 FAILED THIS IGN, test ECT sensor. Using a DVOM, measure resistance across sensor terminals. See ECT SENSOR RESISTANCE VALUES  table. If scan tool does not display DTC P0118 FAILED THIS IGN, see DIAGNOSTIC AIDS  .
  4. Disconnect ECT sensor harness connector. Using fused jumper wire, connect ECT sensor harness connector terminals together. Using scan tool, read ENG COOL TEMP display. If temperature is 284°F (140°C) or greater, go to step  6 . If temperature is not as specified, go to next step.
  5. Connect jumper wire between ground and ECT sensor harness connector Blue/Red wire. Using scan tool, read ENG COOL TEMP display. If reading is 284°F (140°C) or greater, go to step  7 . If reading is not as specified, go to step  8 .
  6. Check for faulty connection at ECT sensor. Repair as necessary and retest system. If connection is okay, go to step  10 .
  7. Turn ignition off. Disconnect PCM harness connectors. Check for open circuit in Blue wire between PCM harness connector terminal E8 and ECT sensor harness connector. See Figure and Figure . Repair as necessary. Retest system. If no problem was found, go to step  9 .
  8. Turn ignition off. Disconnect PCM harness connectors. Check for open circuit in Blue/Red wire between PCM harness connector terminal E9 and ECT sensor. See Figure and Figure . Repair as necessary and retest system. If no problem was found, go to next step.
  9. Check for faulty ECT sensor input or ground circuit connection at PCM. Repair as necessary and retest system. If no problem is found, go to step  11 .
  10. Replace ECT sensor. Retest system.
  11. Replace and reprogram PCM using required equipment. See PROGRAMMING  . Retest system.
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