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Home >> Suzuki >> 2001 >> XL-7 Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Engine Controls - Self-Diagnostics - 1.8L) >> Diagnostic Tests >> DTC P0135: Heated Oxygen Sensor No. 1 - Heater Circuit Malfunction >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 2002 Suzuki Esteem. However, it is still accessible from the selected car via links, so may be relevant.
  1. If engine system check has been performed, go to next step. If engine system check has not been performed, go to A4: ENGINE SYSTEM CHECK  under SYSTEM TESTS.
  2. Turn ignition off. Disconnect HO2S No. 1 4-pin harness connector. HO2S No. 1 is located in exhaust pipe before catalytic convertor. Measure resistance between HO2S No. 1 pigtail terminals No. 3 (Blue/Orange wire) and No. 4 (Black/White wire). See Figure . If resistance is 2-6 ohms at about 68°F (20°C), go to next step. If resistance is not 2-6 ohms at about 68°F (20°C), replace HO2S No. 1. After repair, repeat DTC CONFIRMATION TEST  .
  3. Reconnect HO2S No. 1 harness connector. Turn ignition on. Backprobing at ECM, measure voltage between ground and ECM harness connector C20 terminal No. 19 (Blue/Orange wire). See Figure . If 10-14 volts are present, go to step  4 . If 10-14 volts are not present, go to next step.
  4. Check for open, short to ground or poor terminal connections in Blue/Orange wire between HO2S No. 1 and ECM harness connector C20. See Figure and Figure . Also, check for open or poor terminal connection in Black/White wire between HO2S No. 1 and ignition switch. See WIRING DIAGRAMS article. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If no problem is found, go to next step.
  5. Substitute a known good ECM, and repeat DTC CONFIRMATION TEST  . If DTC does not reset, testing is complete.
  6. Start engine and allow it to reach normal operating temperature. Backprobing at ECM, measure voltage between ground and ECM harness connector C20 terminal No. 19 (Blue/Orange wire). See Figure . If 0-1 volt is present, problem is probably intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. If 0-1 volt is not present, go to next step.
  7. Turn ignition off. Disconnect ECM 28-pin harness connector C20. ECM is located under instrument panel, behind glove box. See Figure . Check for poor terminal contact at ECM harness connector C20. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If no problem is found, go to next step.
  8. Substitute a known good ECM, and repeat DTC CONFIRMATION TEST  . If DTC does not reset, testing is complete.
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