Page 31 of 38
① During the refilling of brake oil, if the refilling pressure is not maintained for certain period or
above, the oil level within the oil reservoir will lower at the finish of the refilling. Therefore, it’s
required to refill more brake oil or maintain the refilling pressure for certain period.
② The time period marked in the regular operations refers to the general circulation period.
③ The inside of after-service HECU is at moisture status, therefore, it may not conduct the air
discharge mode operation (see succeeding item 5⑥ for the definition of air discharge mode) but
directly conduct the air discharge operation on all wheels (However, in order to meet with the
performance and pedal comfort, it’s preferable to conduct the air discharge mode operation).
④ During the air discharge mode operation, the voltage supplied to HECU is preferably at
10~12V. However, during the use of checking devices, it will be OK to use the vehicle amounted
battery. (The repeated air discharge mode operation with high voltage may damage the coil of ECU
components).
4. Determination Method for Vehicles with Air Discharge Trouble
Leakage test
Differentiation
Category
ECU functioning or
not
Excessive
leakage
Minor
leakage
Note
Case 1 Normal functioning O.K O.K
Normal functioning, no separate
repetition required
Case 2 Normal functioning O.K N.G
Abnormal functioning, separate
repetition required
Case 3 Normal functioning N.G N.G
Abnormal functioning, separate
repetition required
Case 4 Not functioning O.K O.K
Abnormal functioning, separate
repetition required
Case 5 Not functioning O.K N.G
Abnormal functioning, separate
repetition required
Case 6 Not functioning N.G N.G
Abnormal functioning, separate
repetition required
† Case 1 : The status at finish of normal functioning.
† Case 2 : The status that the connection of brake (HECU hole portion/brake pipe/brake
hose) is poor and therefore needs rework.
† Case 3 : The status same with Case 2, but it may cause the status incapable of
repetition when the leakage is really severe.
† Case 4 : Internal circuit air discharge trouble of HECU. It's the status necessary for
repetition as the ABS may cause the sponge phenomenon after functioning for one time.
† Case 5 : The comprehensive trouble of Case 2 and Case 4. The status necessary for
repetition.
†
Case 6: The status similar to Case 5, but it may cause the status incapable of repetition
when the leakage is really severe.
5. Measures in Event of Troubles during Air Discharge and Oil Refill (for internal dry
status of brake system)
① Implementation of trouble determination. It’s required to determine the connection portions of
all components from the general pump to the wheel branch pump: HECU hole portion, connection
portion of brake pipe, connection portion of brake hose, brake caliper and the air discharge screw
portion of brake, and etc.
② After the determination of the trouble, re-assemble in accordance with the provisions in order
to avoid the further occurrence of leakage.
③ Connect the repetition device to the 25-pin connector of the ECU or connect the checking
device to the line K (pin 7). Use the specific wiring to connect to the connectors. During the
connection to line K (pin 7), make the vehicle at power on or start status. 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 oil.
To Next Page
Loading...
