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④. Check the HECU with repetition device or checking device and determine the existence of
trouble code. If with trouble code, firstly conduct the operation for deletion of the trouble code (if
the trouble in above item ① is not determined, it’s necessary to determine the existence of
trouble code). When the trouble code can’t be deleted, operate with reference to the Trouble
Checklist of Trouble Code in section 2.4 (In case of trouble of HU, motor and ECU, the air
discharge and oil refill can’t be conducted at the inside of the HECU).
⑤ After the brake pedal is depressed, open the air discharge screw attached onto the wheel brake
caliper or drum brake to discharge the air. Conduct this operation on all wheels, till that the brake
oil discharged from the air discharge screw is free of air and the brake pedal is properly rigid. Refer
to the operation in item ⑩ in using the repetition device capable of vacuum formation and
refilling of brake liquid.
⑥ Conduct the air discharge mode by means of the repetition device or the checking device. If
there has no reaction force when the brake pedal is depressed, then repeat the operation of pedal
depressing and pedal releasing, till the air discharge mode is completed (air discharge mode: repeat
the start in 2s interval, stop the normal close valve of HECU for 1min, and continually drive the
motor. The repeated operation of pedal depressing and pedal releasing is conducted within the
period of normal close electromagnetic valve and motor drive).
⑦ The operation in item (air discharge) should be repeated for all wheels. ⑤
⑧ Measure the brake pedal travel. If not meet with the provisions, repeat the operations in item
⑥ (air discharge mode) and item ⑤ (air discharge). If the brake pedal travel doesn't meet with
the provisions after the air discharge mode and air discharge are repeated for above 10 times,
replace with after-service HECU (wet type) and then repeat the operations from the beginning.
⑨ Connect the repetition device and checking device to the HECU and again determine the
existence of trouble code. If with trouble code, delete the trouble code and then disconnect the
repetition device or checking device.
⑩ During the use of other repetition devices (the equipment capable of vacuum formation and
liquid refilling), the implementation method is as follows:
† Conduct in accordance with the contents in above item ①～④;
† When the vacuum pump is sufficiently driving for approximate 60s, the inside of brake
system will form the vacuum status.
C Start the operation of air discharge mode in above item ⑥ 10s before the vacuum cut-off.
C Without the repeated operations of pedal depressing and pedal releasing.
† Conduct the brake liquid refilling operation (above 7bar/100Psi) for above 20s at the same
time of vacuum cut-off.
† Complete the brake liquid refill and air discharge mode.
† Conduct the operation based on the contents in above item ⑧～⑨.
6. Measures in Event of Trouble during Checking and ABS Functioning Test (for internal
wet status of brake system)
① Connect the repetition device or checking device. The following conditions must be
guaranteed:
† Use the specific wiring while connecting to the 25-pin connector of ECU.
† The vehicle should be at power on status or start status while connecting to line K (pin
7).
† The oil reservoir of the general pump is connected with the device for continual supply
of brake oil or it’s required that the oil reservoir should have enough oil during the
supply of brake liquid.
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