VOLVO
ECM-U003700 - Vehicle Communication Bus B. General Failure Information. No sub type information
System
Motorstyring (ECM)
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Hva betyr feilkoden?
The engine control module (ECM) monitors the communication with the other control modules on the sensor CAN. The code is set when it detects faulty communication, and the fault may lie in the wiring or in the connectors.
Mulige årsaker
- Contact resistance or oxidation in the connectors
- Open circuit in one of the CAN network wires
- One of the CAN wires is shorted to ground
- One of the CAN wires is shorted to voltage
- The CAN wires are shorted to each other
Hva du kan gjøre
- 1Read the code with a diagnostic tool and check whether it is active or only stored
- 2Check the connectors to the engine control module and to other control modules on the sensor CAN for contact resistance and oxidation
- 3Use a multimeter to check that the CAN wires have no break, no contact with ground or voltage, and no contact with each other
- 4Gently move the wiring harness with the ignition on and see whether the code follows
- 5Have a workshop check the load on the CAN network and which control module is disturbing the communication, since the fault does not always lie in the engine control module
Symptomer du kan merke1
- Red warning symbol and text message in the display
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