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Home >> Isuzu >> 1987 >> Impulse Base, Standard, MSG4K >> Repair and Diagnosis >> Engine Performance >> System >> I-TEC Control System >> Diagnosis & Testing >> Test 2 - Oxygen Sensor (Codes 13, 44 And 45) >> Circuit Testing

Circuit Testing

  1. Unplug ECU connectors at ECU. Disconnect oxygen sensor lead at connector. Check for continuity and between ECU connector terminal No. 30 and oxygen sensor connector. If no continuity exists, repair or replace harness.
  2. If circuit is good, install a new oxygen sensor. Road test vehicle. Check if same trouble code is displayed.
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