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Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
99 6. Malfunction indicator lamp 1) Overview The malfunction indicator lamp is located on the instrument. In event of malfunction of engine control system units, 2) Working Principle The malfunction indicator lamp (MIL) is located on the Functions of malfunction indicator lamp: z The malfunction indicator lamp reminds the driver of the occurrence of malfunction. The vehicle shall be serviced as soon as possible. z The malfunction indicator lamp lights up during the test of the malfunction indicator lamp. z If the diagnosis procedure requests to light up the malfunction indicator lamp, one diagnosis trouble code will be stored. Light-up of malfunction indicator lamp z When the ignition switch is turned on but the engine is not started, the malfunction indicator lamp will light up for 5s and then go out. z The malfunction indicator lamp goes out after the engine is started. z If any malfunction is detected by the self-diagnosis system, the malfunction indicator lamp will keep lighted up. z If no malfunction is detected, the malfunction indicator lamp will go out. 3) Measurement analysis
4) Malfunction Mode Short-circuit or open-circuit between engine control 5) Troubleshooting: Use Sunray special diagnosis instrument to check the Malfunction indicator lamp OBD indicator lamp |