Mileage of about 40,000 km, models for TRJ150L, ​​equipped 2TR engine 2012 FAW Toyota Prado SUVs. Users reflect: the car park one night, the next day after starting the engine flameout sometimes soon, need to start the job again.

        Inspection and analysis: maintenance personnel to detect the engine control unit, found fault code B279A ---- burglar V4.8 BMW Creator C310 control unit communication line signal sustained high output, the fault code can be cleared. The car theft between the control unit and the engine control unit via the data bus to transfer data, if communication is interrupted, the engine is started prohibited. According to the user reflect, should belong to the fault alarm onset.

        Schematic reference service manual, anti-theft control unit to measure the communication line between the engine control unit, conducting normal. Measuring security control unit grounding line, and the body was found between its resistance to 235Ω, abnormal. Anti-theft control unit grounding line is bad, will inevitably lead to the data bus signal voltage error.

        Ground resistance measurements theft control unit between the terminal and Ground end G44-12 for 0.7Ω, normal. Illustrate the problem with the connection between the body G44-12. Read wiring diagrams found G44-12 To connect via junction box unit J / 3A-71 terminal and the body of B NO.3. The J / B NO.3 removed, the control ELM327 USB Plastic circuit diagram of a check J / B NO.3 internal conductive case. JIB NO.3 found in 3A-71,3C-44,3B-20,3A-34 and 3C-5 has traces of water erosion, the problem lies here.

        Troubleshooting: Wash thoroughly J / B NO.3 circuit cleaners, one night after the vehicle parked next test, the engine start process is completely normal.