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Home >> Hyundai >> 1996 >> Accent Base, 2D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> DTC P0135/P0141 - O2S Heater Circuit Malfunction

DTC P0135/P0141 - O2S Heater Circuit Malfunction

  1. Install scan tool. Start engine and check if DTC P0135 or P0141 is present. If DTC is present, go to next step. If DTC is not present, problem is intermittent.
  2. Turn ignition off. Disconnect affected O2S harness connector. Turn ignition on. Using DVOM, check voltage between affected O2S harness connector terminal No. 4 and ground. If battery voltage is present, go to next step. If battery is not present, check circuit between terminal No. 4 and fuel pump relay. See appropriate wiring diagram in WIRING DIAGRAMS  section.
  3. Turn ignition off. Disconnect ECM harness connector. Check for open in circuit between ECM terminal No. 12 (front O2S) or terminal No. 39 (rear O2S) and O2S harness connector terminal No. 2. Repair circuit as necessary. If circuit is okay, go to next step.
  4. Check for open in circuit between O2S harness connector terminal No. 1 and ECM harness connector terminal No. 1. Repair circuit as necessary. If circuit is okay, go to next step.
  5. Check for continuity in circuit between O2S harness connector terminal No. 2 and ECM harness connector terminal No. 12. If continuity is present, go to next step. If continuity is not present, repair circuit between O2S harness connector terminal No. 2 and ECM harness connector terminal No. 12.
  6. Reconnect ECM harness connector. Using DVOM, check O2S heater resistance. With engine off, resistance should be 1.7-2.5 ohms. Replace O2S if resistance is not as specified. If resistance is okay, go to next step.
  7. Clear DTC. See CLEARING DTC(S)  . Retest system. If DTC resets, replace ECM.
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