H476-USER MANUAL-FULL BOOK-ENGLISH

OPERATION

Braking

Reverse test request

The pedal activation has to be carried out on the following way: After fault detection, the ignition must be switched off and on in order to reset EBS: • The ignition-off phase must be at least 5 sec., to allow power-down of EBS, and • During ignition-off phase the brake pedal must be released, to avoid braking in wake-up mode without reset of EBS. • After ignition is switched on, for at least 7 sec.: • The vehicle must be in stillstand, and • • Brake pedal must be released. • Supply voltage EBS sufficient for electronically controlled braking. • Parking brake should be released in case of TCM failures. • Warning lamp is on, system restriction is active. • Brake pedal actuation, with the following features: • During standstill, the driver is instructed via dashboard symbol "braking" to do a braking. • Pedal actuation does not start before 7 sec. after ignition is switched on. • Pedal actuation must increase to full brake position, without any condition. • Full brake position must be hold for at least 3 sec..

• Pedal decrease until fully release, without any condition. • Brake pedal must be fully released for at least 3 sec.. • Warning lamp is on. System restriction is not active during braking. Braking is controlled by electronic pressure control. Brake pedal test is successful: • No fault is detected during the braking. • Warning lamp is switched off, system restriction remains not active. Brake pedal test is not successful: • A fault is detected during the braking, or • Maximum braking time of 25 sec. is expired, or • The vehicle starts moving. • Warning lamp remains on, system restriction is activated. • An ignition reset is needed to start brake pedal test again.

There are some kind of failures which can’t be detected by EBS directly, only via monitoring of the behavior of the vehicle and the brake system. These monitoring functions are called plausibility checks. If a plausibility failure is detected by the EBS, it can be restored according to the legal requirements only if EBS carries out system test (called reverse test) and the result of the test is positive (operation of the brake system is correct). It means when the cause of the failure is eliminated (it was just a temporary failure, or the vehicle is repaired), than a reverse test has to be carried out. To make EBS to be able to carry out the reverse test, the driver has to activate the brake pedal once under a defined condition. When EBS requires such a pedal activation to restore the failure, it will send a request with the following failure code: Path: 253 (Vehicle brake system) Type: 201 (Press brake pedal request) (SPN 64969) It is highly recommended to give a clear text on the instrument cluster to the driver when this pedal activation requested and the user manual of the vehicle should describe clearly the conditions how to do it.

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