SCR system failure analysis and check-1
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scr system failure

During the operation of the vehicle, when the instrument panel failure light is constantly on, the vehicle suddenly flameout and then can not start.

Analysis fault code Of scr system failure

Read the fault code, and preliminarily analyze the power failure of some controllers.

As a result, the power is not on, and the parts have no CAN signal.

Current fault code: CAN accept fault (AT10G1),

AT10G1 represents the nitrogen and oxygen sensor communication problem,

Can message is collected by Zhou Ligong software under the premise of the current fault code.

Check whether there is a message sent by the nitrogen and oxygen sensor with frame ID 18F00F52.

To judge whether the engine can receive nitrogen and oxygen sensor information.

In the collection content of the whole CAN message,

There were no messages from the nitrogen and oxygen sensors,

Recheck the wiring harness or replace the nitrogen and oxygen sensor.

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  • Sinotruk trucks

Check the wiring harness of scr system failure

The nitrogen and oxygen sensor was found to have no power supply on the 24V power supply line.

It can be seen from the circuit diagram that the power supply line has excessive relay of the whole vehicle.

The front-end relay box of the vehicle has not found the relevant relay.

Adopt fly line processing.After the fly line processing, there is no fault code,

Normal start-up and normal urea consumption.

Pay attention to scr system failure

When troubleshooting CAN network problems, if you do not check the OBD diagnostic port,

Remember to unplug the yellow box (white box) CAN wire,

Because the yellow box has 120 ohms of resistance,

It will cause some unnecessary trouble for troubleshooting.

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