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SERVICE BRAKES
Anti-lock Braking System Troubleshooting
When diagnostic trouble code “52 MOTOR
is displayed
[Hint]
The ABS ECU outputs this diagnostic trouble code for
If there is motor operation noise when wheel speed
the motor relay and motor in the following cases.
exceeds
when starting up after the
l
When the motor relay does not function
engine is started, or when there is forced scan tool
l
When there is trouble with the motor itself and it
drive, there is a broken or short circuited motor
does not revolve
monitor wire.
l
When the motor ground line is disconnected and
the motor does not revolve
l
When the motor continues to revolve
Does the motor make a
Yes
Broken wire or short
noise
when wheel speed
1
in motor monitor line
exceeds 6 km/h
or
Remove the motor relay and
check resistance values.
No.
86:
resistance
value
No.
87: no
Motor relay malfunction
Replace motor relay.
I
Battery voltage is applied on
terminals
and
grounded.
No.
87: continuity
Yes
Is pump motor ground
normally?
Connect ground wire.
Does voltage between body
B r o k e n w i r e i n p u m p
connector terminal and
motor power circuit
ground indicate battery vol-
tage?
Repair the harness.
Yes
Connect the HU
tor and remove the ECU
connector.
I
Is resistance between body
Malfunction of harness
connector terminal No. 2 and
between HU and ECU
ohms?
Yes
Is resistance between ECU
harness side connector ter-
N
O
No. 5 and ground 0.1
0.3 ohm?
Yes
ABS ECU malfunction
TSB Revision
Replace ABS ECU.
Summary of Contents for 1989 Galant
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