"The breakdown of strange " , a small bolt beats service station!

Receive a master to appeal recently, said to encounter a very peculiar breakdown case, go repairing before service station, did not foster cordial relations between states, so specially comes round to appeal small course. In maintaining a course, encountered many bank, this period small course takes everybody to see this " strange " breakdown case.

1, use diagnostic hotshot to read take malfunction code

Use decoder takes a system, discover decoder cannot be entered normally; Explain CAN network may be put in breakdown, check line of OBD mouth CAN.

2, measure OBD mouth CANH and CANL

Measure OBD mouth CANH to be + 8.5V, CANL is + 8.5V, CAN line is unusual; Below normal circumstance, line of two groups of CAN is worth addition to be 5V left and right sides. Suspicion is CAN network line has a problem, the plan flies directly first line, read take engine malfunction code, solve engine to cannot be worn above all the problem of the car.

3, fly directly from ECU the line comes OBD mouth

After flying line, measure line voltage of CANH, CANL, still be + 8.5V. Suspicion is computer board problem, next plans change computer board.