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DIESEL FUEL – Troubleshooting 13D-15 Code No. 18 Air flow sensor system Probable cause Range of Check Ignition switch: ON Set Conditions Sensor output voltage is 100 mV or less for 1.5 seconds or Sensor output voltage is 1,200 mV or more for 1.5 seconds Range of Check Engine speed : 700 r/min or more Set Conditions Sensor output is 10 kg/h or less for 1 second Malfunction of the air flow sensor Improper connector contact, open circuit or Malfunction of the engine-ECU (2) NG Repair Measure at the air flow sensor connector A-73. Disconnect the connector and measure at the harness (1) Voltage between 4 and earth (Ignition switch: ON) OK: System voltage (2) Voltage between 3 and earth (Ignition switch: ON) OK: 4.8 – 5.2 V (3) Continuity between 6 and earth OK: Continuity (1) NG OK Repair NG Check the following connectors: A-73, A-121 NG Repair NG NG OK Check the harness wire between the air flow sensor and the OK Check trouble symptom. Check the harness wire between the air flow sensor and the Check the following connectors: A-120, A-121 OK NG Check the harness wire between the air flow sensor and the Repair OK NG Replace the engine-ECU. NG Check trouble symptom. NG Replace the engine-ECU. OK NG INTERMITTENT MALFUNCTIONS MUT- II Data list 08 Air flow sensor (Refer to P.13D-46.) (3) NG Check the harness wire between the air flow sensor and the *: Refer to ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1) |