Anti-lock brake system (ABS control unit)
P-22
For the imperfect measure of harness grounding, the connector, where water and moisture ingress, under
the effect of siphon, through the pore passages in the harness, into the ECU of ABS control unit, will
cause the function ineffective.
Measures taken: Smear sealant on the bare end of harness and apply the heat-shrink tube envelope.
Recommend use for sealant: Raychem sealant.
(i) When connecting the brake line of ABS control unit brake line, the correct connection has to be assured.
The ECU of ABS control unit is neither unable to judge whether the brake line is properly connected, nor
to perform the fault protection. Wrong connection may result in serious accidents.
The marks on the hydraulic pressure controller of ABS control unit vary depending to different
production places:
MC1: in connection with the brake line 1 of brake master cylinder;
MC2: in connection with the brake line 2 of brake master cylinder;
FL: in connection with the brake line of cylinder on the left front brake wheel cylinders;
FR: in connection with the brake line of cylinder on the right front brake wheel cylinders;
RL: in connection with the brake line of cylinder on the left rear brake wheel cylinders;
RR: in connection with the brake line of cylinder on the right rear brake wheel cylinders;
(j) The correct connection of wheel speed sensor has to be guaranteed.
Check the ABS control unit prior to the diagnostics
1. Be sure that the recommended specifications of tire and wheel are installed on the vehicle. The coaxial
style pattern and depth must be consistent.
2. Check whether there are any leakages in the hydraulic pressure regulator, brake line and connector.
3. Check the ABS control unit fuse.
4. Be sure that the battery has been fully charged.
5. Check whether there is any uncleanness in the battery connection or any looseness of terminals. Be sure
of the good grounding.
6. The parts of ABS control unit are very sensible to the electromagnetic interference. If any intermittent
faults suspected, check whether the anti-theft device and on-board mobile phone added after sales are
correctly installed.
Tightening bolts (4pcs)
ABS control unit (with
reflux pump motor and
solenoid relay)
Solenoids (8pcs) [4
input valves and 4
output valves]
Hydraulic
controller
Reflux pump
motor
To Next Page
Loading...