Mitsubishi 1989-1993 GALANT Service Manual page 1153

SERVICE BRAKES
When diagnostic trouble code "51 VALVE RLY" is displayed
When the ignition switch is turned ON, the ABS
ECU switches the valve
initial check, compares the voltage of the signal to
the valve relay and valve power monitor line voltage
t o c h e c k w h e t h e r t h e v a l v e relay operation is
IGNITION
MAIN FUSIBLE
SWITCH
LINK @
OFF and ON for an
relay
When the valve relay is
checked, are the following
conditions found?
value 60-120 Q
No. 30-No. 87a: continuity
t y
When battery voltage is ap-
plied between terminals
No. 86 and No.85 grounded.
t y
remove the HU connec-
With the ignition key "ON",
does the voltage between
the connector terminal No.
tery voltage?
Connect the HU harness
and remove the ECU con-
nector.
1440679
Does resistance between
body connector terminal
dicate 60-120 ohm?
TSB Revision
normal. In addition, normally it monitors whether or
not there is power in the valve power monitor line
since the valve relay is normally ON. Then, if the
supply of power to the valve power monitor line is
interrupted, this diagnostic trouble code will output.
No
resistance
Yes
the valve relay and
Yes
No
I
Yes
Valve relay malfunction
Replace valve relay.
broken?
Repair harness.
I
between HU and ECU
I
Replace ABS ECU.
I