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general information - Martin Nez

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FI SYSTEM DIAGNOSIS 4-79“C44” (P0130/P0135) HO2 SENSOR (HO2S) CIRCUIT MALFUNCTIONC44(P0130)C44(P0135)DETECTED CONDITIONHO2 sensor output voltage is not inputto ECM during engine operation andrunning condition.(Sensor voltage 0.1 V)The heater can not operate so thatheater operation voltage is not suppliedto the oxygen heater circuit.POSSIBLE CAUSE• HO2 sensor circuit open or shorted to ground.• Fuel system malfunction.• ECM malfunction.• Battery voltage supply to the HO2 sensor.ECME2OXOXHB/BrW/GW/BO/WEngine stopswitchTo GPswitchSide-standrelayIgnitionswitchWBGrWHO2 sensorINSPECTIONStep 1 (When indicating C44/P0130:)1) Turn the ignition switch OFF.2) Check the HO2 sensor for loose or poor contacts.If OK, then check the HO2 sensor lead wire continuity.13) Disconnect the HO2 sensor coupler4) Check the continuity between W/G wire A and ground.5) Also, check the continuity between W/G wire A and B/Br wireB. If the sound is not heard from the tester, the circuit conditionis OK. 09900-25008: Multi-circuit tester set Tester knob indication: Continuity test ()1!

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