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Home >> Suzuki >> 1998 >> Esteem GL, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Tests >> Diagnostic Tests >> DTC P0136: Ho2S No. 2 Circuit Malfunction
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DTC P0136: Ho2S No. 2 Circuit Malfunction

  1. Inspect exhaust system for damage or leaks. Repair as necessary and retest system. If exhaust system is okay, turn ignition off and connect scan tool to Data Link Connector (DLC). Start engine and go to next step.
  2. Drive vehicle under normal driving conditions for 5 minutes. Observe HO2S No. 2 output voltage and short term fuel trim using DATA LIST mode on scan tool. Record readings. If HO2S No. 2 output voltage reading is less than 1.275 volts, go to next step. If reading is more than 1.275 volts, check for an open in Blue wire or Pink wire between HO2S No. 2 and PCM. If wiring is okay, check for faulty HO2S No. 2. Repair as necessary. Retest system.
  3. If short term fuel trim varied between -20 and +20 percent, go to next step. If short term fuel trim does not vary between -20 and +20 percent, check fuel system. See DTC P0171  : FUEL SYSTEM LEAN OR DTC P0172: FUEL SYSTEM RICH.
  4. Check Pink wire and Blue wire for any opens, shorts or poor connections. Repair as necessary. If wiring and connections are okay, replace HO2S No. 2. Retest system.
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