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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 P0141: Heated Oxygen Sensor No. 2 - 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. 2 4-pin harness connector. HO2S No. 2 is located in exhaust pipe after catalytic convertor. Measure resistance between HO2S No. 2 pigtail terminals No. 3 (Light Green/Black wire) and No. 4 (Black/White wire). If resistance is 4-10 ohms at about 68°F (20°C), go to next step. If resistance is not 4-10 ohms at about 68°F (20°C), replace HO2S No. 2. After repair, repeat DTC CONFIRMATION TEST  .
  3. Reconnect HO2S No. 2 harness connector. Turn ignition on. Backprobing at ECM, measure voltage between ground and ECM harness connector C99 terminal No. 6 (Light Green/Black wire). See Figure . If voltage is 10-14 volts, go to step  6 . If voltage is not 10-14 volts, go to next step.
  4. Check for open or short to ground in Light Green/Black between HO2S No. 2 and ECM harness connector C99. See WIRING DIAGRAMS article. Also, check for open or short to ground in Black/White wire between HO2S No. 2 and ignition switch. If problem is found, repair as wires are necessary. 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 C99 terminal No. 6 (Light Green/Black wire). See Figure . If voltage is 0-1 volt, problem is probably intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. If voltage is not as specified, go to next step.
  7. Turn ignition off. Disconnect ECM 26-pin harness connector C99. ECM is located under instrument panel, behind glove box. See Figure . Check for poor terminal contact at ECM harness connector C99. 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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