One 2009 HFC6500KA 1 C8RefineBusiness car causesengineThe fault light alarm comes to our company for repair.This vehicle is equipped with 2.8L 4DAl~281 turbocharged high-pressure common rail dieselengineThe engine adopts BOSCH EDCl6 electronic control system, five speed manual transmission, and the accumulated driving distance is 14500km.
Fault phenomenon: after receiving the car, the author started the engine and analyzed it. Since the engine fault light gave an alarm, the engine electronic control system may have a fault.
Fault diagnosis: the author read the fault code of the engine system with the diagnostic instrument. The fault code is P0104, and the zero drift of the air flow sensor is lower than the lower limit;P0100,The uncorrected air flow signal measured by the air flow sensor is too large or too small (open circuit or short circuit of the wiring), and there is no signal;P0110,The wiring of the additional air temperature sensor on the air flow sensor is short circuited or open circuited, and there is no signal;P0504,The primary and secondary brake pedal signals are unreliable and invalid.Clear the above fault code, and the fault code disappears.Read the data stream when the engine is idling, and the original signal voltage of intake air temperature is 1.63vcoolingLiquid low voltage value 0.88V;Intake air temperature of air flow sensor is 32.86 ℃;Air system deviation 2550mgHub intake control EGR rate 100.00%;Exhaust gas number cycle deviation correction position 20.00%;The original value of exhaust gas number cycle EGR signal is 4.99V;The status indicator of glow plug actuator 212 is off;The atmospheric pressure is 101kPa, and the output voltage of atmospheric pressure is 4.0V;The rail pressure of the fuel system is 32.96MPa (the maximum actual rail pressure is 33.18MPa, and the actual set rail pressure is 32.50MPa);The output voltage of rail pressure sensor is 1.18V;Rail pressure control deviation is 655us.It is not possible to see the fault through the above data stream reading.Then, according to the prompt of the fault code, use a multimeter to check the power supply of each terminal of the 5P connector of the air flow sensor, and no abnormality is found.Start the engine again, turn on all electrical appliances, including the air conditioner, and then step on the brake pedal repeatedly. The engine fault light starts to light up again.Is the engine fault light on related to the braking system?The author couldn't believe it, so he checked the brake light switch at the brake pedal and found that the brake light switch of this model was a 4-wire system. After careful observation, a blue terminal on the brake light switch connector was out of slot. The terminal was repaired and the brake light switch connector was firmly inserted. The engine fault light went out, and the engine fault light no longer gave an alarm after the road test.Note: At present, JianghuaiRefineCommercial vehicles are equipped with 4-wire brake light switch only for Ruifeng III generation and 2.8L 4DAl-281 turbocharged high-pressure common rail diesel engine vehicles. There are two sets of contacts in the 4-wire brake light switch, one set of normally open contacts and one set of normally closed contacts, which respectively communicate with the engine ECU.
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