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Home >> Hyundai >> 1994 >> Scoupe LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> Code 3128 - Heated Oxygen Sensor Failure >> Harness Inspection

Harness Inspection

  1. Check HO2S heater power supply voltage. Disconnect 2-pin harness connector. Turn ignition on. Using DVOM, measure voltage between Green/Yellow wire of harness connector and vehicle ground. If voltage is less than battery voltage, inspect and repair circuit as needed.
  2. Check continuity of circuit between HO2S and ECM. Turn ignition off. Disconnect single pin harness connector and ECM harness connector. Connect jumper wire between ECM harness connector terminal No. 28 (Green wire) and vehicle ground.
  3. Using ohmmeter, measure resistance between single pin harness connector terminal and vehicle ground. If continuity does not exist, inspect and repair circuit as needed.
  4. Check HO2S heater ground circuit. Disconnect 2-pin harness connector. Using ohmmeter, measure resistance between Black wire of harness connector and vehicle ground. If continuity does not exist, inspect and repair circuit as needed.
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