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Self-diagnosis
Test prerequisites
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● The diagnosis procedure can only be started with the vehicle stationary and the ignition switched on (or with engine running). The diagnosis cannot be started if wheel speed exceeds 2.75 km/h.
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● Supply voltage OK (at least 10.0 V).
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● Connector at control unit -J104 correctly plugged in (retainer is clipped in).
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● Wheel speed sensors must be installed correctly
=> Brake System; Repair group 45
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● Permissible and identical wheels and tyre size Correct tyre pressure at all wheels.
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● Mechanical and hydraulic parts of the brake system are OK: Hydraulic connections and pipes are not leaking (visual check of hydraulic unit, brake calipers, wheel brake cylinder, tandem brake master cylinder).
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● Wheel bearings and wheel bearing play OK.
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● While testing the system, ensure that the vehicle's electrics are not subjected to electromagnetic interference, i.e. keep the vehicle away from equipment with a high current draw, such as electric welding units.
Important
Diagnosis is not terminated at a speed v = > 20 km/h. Risk of accident.
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