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MPI <4G9> – Troubleshooting 13C-14 INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE Code No. P0100 Air flow sensor system Probable cause Range of Check D Engine speed: 500 r/min or more Set Conditions D The sensor output frequency is 3.3 Hz or less for 4 seconds. D Malfunction of air flow sensor D Open or short circuit in air flow sensor circuit or D Malfunction of engine-ECU OK Check the trouble symptoms. NG Replace the engine-ECU. OK Check the harness between the air NG Repair (3) NG Check the following connectors: NG Repair OK To the next page Check the harness between the air (2) NG OK Check the trouble symptoms. NG Replace the engine-ECU. OK Check the harness between the air NG Repair NG Check the following connector: NG Repair OK Check the harness between the air NG Repair OK Check the following connector: (1) NG Measure at engine-ECU connector D Measure the voltage at the D Ignition switch: ON D Voltage between terminal 90 and OK Measure at air flow sensor D Disconnect the connector and (1) Voltage between terminal 3 and earth (Ignition switch: ON) (2) Voltage between terminal 4 and earth (Ignition switch: ON) (3) Resistance between terminal 5 and earth Ω or less NG Check the following connector: NG Repair MUT- II Data list 12 Air flow sensor (Refer to P.13C-74, DATA LIST OK Transient malfunction |