Common fault codes: P0628, P0628

Symptoms of failure: engine output decreases, engine fails to ignite or stalls.

SCV valve function: used to control the inlet diesel flow of the engine diesel fuel supply pump.

Troubleshooting methods：

1. Remove the SCV valve and clean it with diesel fuel. Rule out whether the alarm is caused by stuck foreign objects.

2. Turn the key to the ON position. The front valve core will move at the moment when the power is turned on, and the valve core will also change as the throttle is pulled. You can visually see whether it is in a normal state.

3. Measure the resistance value between the solenoid valve terminals

Put the start key in the OFF position, remove the connector of the diesel pump solenoid valve, and measure the resistance value between terminal 1 and terminal 2 of the diesel pump solenoid valve. The standard value is 7.9±0.5Ω. If the error is large, it is The solenoid valve itself is faulty and needs to be replaced.