Xiali Junya car car failure analysis and troubleshooting

Fault phenomenon: A Xiali Junya EFI car has a high water temperature fault. It is found that the cooling fan is not running when the coolant has been "opened".

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Trouble-shooting: After multiple inspections, it is determined that there is no problem with the coolant temperature switch and related lines. The cause of the fault is partial damage to the engine control unit. Since only part of the circuit that controls the cooling fan is damaged, and other parts are completely normal, the owner is not willing to replace the engine control unit for this purpose, and asks the repair shop to try to repair it by appropriate means. After a careful examination of the original vehicle circuit, the maintenance personnel decided to solve this problem by modifying the interface of the temperature switch and related circuits.

First of all, it is necessary to solve the problem of reasonable control of the cooling fan. The original vehicle cooling fan is controlled by the engine control unit to control the opening and closing of the cooling fan according to the coolant temperature signal it receives. After the engine control unit is partially damaged, the repair of the relevant electronic components is extremely difficult. Therefore, the maintenance personnel decided to switch to a new cooling fan control mechanism, and the carburetor type Xiali's cooling fan control method is suitable for use here.

Remove the coolant temperature switch and install a matching tee port at the internal thread. This three-way structure is a modified internal intercommunication three-way brass tube (brass tubes can be easily purchased in many hardware stores, and the modification work can be done after the relevant size is measured). At the other end of the three-way interface, one end is installed with the removed coolant temperature switch, and the plug is reinserted; and one end is equipped with a carburetor type Xiali coolant temperature switch. Next, cut the control line from the engine control unit to the cooling fan relay and route the control line to a plug of the carburetor coolant temperature switch. After the modification is completed, the cooling fan is fully restored to normal operation.

Comment: In the case that the engine control unit is difficult to repair, the coolant temperature switch of the carburetor-type Xiali engine is used to control the operation of the cooling fan, avoiding the replacement of the relatively expensive engine control unit. The more important part of the modification work is the production of the three-prong interface. Before the driver starts, the internal thread matching the engine block and the external thread matching the old and new temperature switches must be accurately measured and the internal waterway can be ensured.

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