Mitsubishi 1989-1993 GALANT Service Manual page 1154

SERVICE BRAKES - Anti-lock Braking System Troubleshooting
When diagnostic trouble code "52 MOTOR RLY" is displayed
The ABS ECU outputs this diagnostic trouble code for
the motor relay and motor in the following cases.
When the motor relay does not function
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When there is trouble with the motor itself and it
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does not revolve
When the motor ground line is disconnected and
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the motor does not revolve
When the motor continues to revolve
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MAIN FUSIBLE
LINK @
[Hint]
If there is motor operation noise when wheel speed
exceeds Gkm/h (4mph) when starting up after the
engine is started, or when there is forced scan tool
drive, there is a broken or short circuited motor
monitor wire.
Does the motor make a
1
when wheel speed
noise
exceeds 6 km/h (4 mph) or
Remove the motor relay and
check resistance values.
resistance
No. 85-No. 86:
value 30-60 9
No. 30-No. 87: no continui-
Battery voltage is applied on
terminals No.85 and No.86
grounded.
No. 30-No. 87: continuity
Yes
Is pump motor ground con-
Does voltage between body
connector terminal 11 and
ground indicate battery vol-
tage?
Yes
Connect the HU tonne
tor and remove the ECU
connector.
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Is resistance between body
connector terminal No. 2 and
ohms?
Is resistance between ECU
harness side connector ter-
0.3 ohm?
Yes
ABS ECU malfunction
Yes
Broken wire or short cir-
Motor relay malfunction
Replace motor relay.
Connect ground wire.
B r o k e n w i r e i n p u m p
motor power circuit
Repair the harness.
N
O
Replace ABS ECU.
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