Mitsubishi 1989-1993 GALANT Service Manual page 1172

SERVICE BRAKES
When diagnostic trouble code "51 VALVE RLY" is displayed
[Explanation]
When the ignition switch is turned ON, the ABS
ECU switches the valve relay OFF and ON for an
initial check, compares the voltage of the signal to
the valve relay and valve power monitor line voltage
to check whether the valve relay operation is
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.
When the valve relay is
checked, are the following
conditions found?
No. 85-No. 86: resistance
value 60-120 52
No. 30-No. 87: No continui-
When battery voltage is ap-
plied between terminals
No. 86 and No. 85 grounded.
No. 30-No. 87a: no continui-
t y
remove the HU connec-
does the voltage between
the connector terminal No.
12 and ground indicate bat-
tery voltage?
Yes
Does resistance between
body connector terminal
No. 2 and terminal No. 27 in-
dicate 60-120 ohm?
Yes
Is there continuity between
body connector terminal No.
22 and ground?
ABS ECU malfunction
broken?
I
Repair harness.
Repair harness.
Replace ABS ECU.
1
I