1.1.3.4.1.8. Steering column module
Warning!Communication with ECU required.
Part 1
One or more signals sent from control unit N73 (EIS [EZS] control unit) via the CAN bus is implausible.
Possible cause:
- N73 (EIS [EZS] control unit)
Affected functions:
- DAS Function
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Test 1: Engine compartment CAN test
Test 2: Check component N73 (EIS [EZS] control unit).
1. Engine compartment CAN test
Test 1.1: Engine compartment CAN test
1.1. Engine compartment CAN test
Test 1.1.1: Procedure in case of CAN faults
Test 1.1.2: Read current CAN configuration and CAN fault codes
Test 1.1.3: Further CAN test options
1.1.1. Procedure in case of CAN faults
Test 1.1.1.1: General test information
Test 1.1.1.2: General CAN fundamentals
Test 1.1.1.3: Possible aids and their usage
Test 1.1.1.4: How do I quickly reach my goal?
1.1.1.1. General test information
Notes on CAN fault codes:CAN timeout fault
- A CAN timeout fault code is set due to the absence of a CAN input signal.The cause of this may be not only the transmitter control unit, but
also the CAN networking.
- For example:No CAN message was received from control unit A.
Bus OFF fault
- A Bus OFF fault code is set, when the control unit cannot send a certain amount of messages to the CAN bus or the messages are
incomplete.The control unit then switches off for a short time from CAN bus.
- For example:CAN controller: CAN bus OFF
Functional CAN fault
- A functional CAN fault code is set because of an implausible CAN input signal.The cause of this is not the CAN networking, but the
transmitter control unit or its sensors.
- For example:CAN signal 'A' from control unit B is implausible.
Notes on CAN faults that cannot be read out as fault codes.Bus wake-up event
- An event that wakes up the bus without reason is designated a bus wake-up event.
- The cause of this is not the CAN networking, but the transmitter control unit or its sensors.
- Further possible causes of fault:
- Magnetic fields caused by nearby high-voltage installations, railroad installations or power plants.
- Magnetic fields can radiate on to lines and control units in rare cases and cause undefined behavior in the control units.
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