Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Faulty configuration
In order to check the control area network (CAN) cables, the resistance in the network must be measured. The resistance between the two controller area network (CAN) wiring, with the network connected 60 Ω. The resistance can differ depending on the configuration of the car. Permitted values are 55-65 Ω. This applies to both the high speed side network and the low speed side network.
HINT: Use the Service Manual Wiring diagram to provide support when taking readings. Take a copy of the data communication side for each model. Note which diagnostic trouble codes (DTCs) are stored in each control module. This facilitates fault-tracing considerably.
Also check if the diagnostic trouble codes (DTCs) for failed communication are stored in the central electronic module (CEM). If this is the case: first fault-trace according to these diagnostic trouble codes (DTCs).
Other information
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.