This guide provides step-by-step instructions on how to troubleshoot and resolve a CAN communication fault related to the Engine Control Unit (ECU) on a Scania truck.
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Error Description:
- No message or incorrect message received from the engine control unit.
Possible Causes:
- Unstable or interrupted CAN communication
- Faulty CAN bus wiring or connection
- Malfunctioning engine control unit
Important Notes:
- When communication fails, the control unit relies on pre-programmed fallback values to manage the compressor.
- Regeneration occurs after each load relief operation.
- A yellow warning lamp will illuminate to indicate the issue.
Recommended Actions:
- Check Fault Codes:
- Verify if diagnostic trouble codes (DTCs) 185 and 313 are or have been active.
- If these codes are not present, a CAN communication fault with the APS unit is unlikely.
- Inspect Engine Control Unit:
- Check for and resolve any existing faults in the ECU.
- Examine CAN Network (ECU):
- Inspect the CAN wiring and connections to the engine control unit for damage, corrosion, or poor contact.
- Examine CAN Network (APS Unit):
- Check the integrity and functionality of the CAN network leading to the APS unit.
Following these steps should help restore proper communication between the control units and resolve the warning indicator. Ensure all wiring and components are properly tested before replacing any units.
For more information about Scania truck,please refer to:Scania Trouble Repair.
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