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Home >> Isuzu >> 2000 >> Rodeo LSE, 2.2 D >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.2L >> Diagnostic Trouble Code Identification >> DTC P0125: ECT Insufficient Temperature For Closed Loop Operation >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic II (OBD-II) system check. See SELF-DIAGNOSTICS - INTRODUCTION article. Go to next step.
  2. If any related ECT DTCs are set, diagnose affected DTC before proceeding. If no related ECT DTCs are set, go to next step.
  3. Allow engine to cool. Check coolant level. If coolant level is low, go to step  9. If coolant level is okay, go to next step.
  4. Start engine and allow it to idle. Using scan tool, monitor ENG COOL TEMP. If temperature increases to 70°F (21°C) within 2 minutes, see DIAGNOSTIC AIDS . If specified temperature is not reached within 2 minutes, go to next step.
  5. Check thermostat operation. If thermostat is operating correctly, go to next step. If thermostat is not operating correctly, go to step  9.
  6. Compare actual coolant temperature with scan tool ECT value. If temperatures are close in value, go to step  9. If temperatures are not close in value, go to next step.
  7. Turn ignition off. Disconnect PCM connector(s). Using a DVOM, measure ECT resistance between PCM White 32-pin harness connector terminal E9 (Blue/Red wire) and other White 32-pin harness connector terminal D8 (Green wire). Compare DVOM readings with ECT SENSOR RESISTANCE VALUES  table under DTC P0117. If chart values equal readings, go to step  12. If chart values do not equal readings, go to next step.
  8. Check for faulty circuits between ECT sensor and PCM harness connector on Blue/Red and Green wires. See appropriate wiring diagram in WIRING DIAGRAMS article. If a problem was found, go to step  10. If no problem was found, go to step  11.
  9. Repair cooling system as necessary. Retest system.
  10. Repair wiring or terminals as necessary. Retest system.
  11. Replace ECT sensor. Retest system.
  12. Replace and reprogram PCM using required equipment. See PROGRAMMING . Retest system.
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