What Are the Faults of the Engine Electronic Control Unit(ECU)?

The engine electronic control unit is generally not prone to problems. Usually, we need to use the decoder to read the faults after the fault light is on, and then solve the problems one by one. There are two situations when an electronic control unit fails with a decoder. One is to read the fault directly, the other is to read no fault at all.

Engine electronic control unit common fault performance.

With the growth of vehicle mileage and service life, the engine electronic control unit will appear some faults.

With the growth of vehicle mileage and service life, the engine electronic control unit will appear some faults. For example, individual integration block aging, damage, resistance, capacitance failure, fixed foot bolts loose and electronic components solder joint loose. These will cause the ECU control function failure or the control system to work poorly, resulting in engine starting difficulties, idle speed instability, poor power, fuel consumption increases, emissions exceeding the standard, etc.

Precautions before ECU repair

• Check the external circuit, eliminate the fault of the external circuit, and check the external circuit is normal before repairing the ECU.
• Check whether there are traces of damage to the external circuit, whether the fixation is firm, solder (adhesive) whether the seal is reliable.
• Check the connection of the wire, especially whether the power cord and the lap iron are normal.