1989 MITSUBISHI GALANT Main fusible

33B-24 ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
[2]GENERATOR ‘I” TERMINAL CIRCUIT
rminal
12AO385
BatteryECUItI1
Main1OOA
fusible0hk
*33>
&CAI
2
I
I\//\/Relay
box
I
(1989 models)
I1TGENERATOR %
NOTE* mark is applicable for 1990, 1991, 1992, 1993 models.
B-16
C-23
[Isl:j
(From 1990 models)
12AQ496
1 TSB Revision

33B-60 ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
[20] EXHAUST VALVE ACTIVATION CIRCUIT (FOR VEHICLE-HEIGHT ADJUSTMENT)Exhaust valve
[for vehicle-height
adjustment)
Usually OFF; ON
vehicle-height
downward Air cleaner
0lOOA Main fusible
4-J link
R&Vbox
F-17
l!!!b
Malfunctm*e*ectwn
ctrcwt
A-l 1
2
8 (
1;
*-1mm =
Exhaust valve
for
vehicle-heightadjustment >
12A0251
*: 1991 models1312AO498
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SERVICE BRAKES - Anti-lock Braking System Troubleshooting35-21
A ABS warning light does not light at all.
[Explanation]
When it does not light up at all, there is a strong
possibility that there is trouble with ABS warning
light or with power to the light.
[Hint]
If other warning lights do not light up either, fuse is
probably blown.
MAIN FUSIBLE
LINK @IGNITIONSWITCH (IG2)IGNITIONSWITCH (IGl)
Ea
1
0 U
, ,8--1I
CL
, VALVE
fI*I1 RELAY 1 Ii 1,
M
i 10
z 13-
--3z2-&
rc11_ 3
t”71
_----
a-II
2
dt II
zz
c:
35 126J.27ABS ECU
1
GND GND GNDv v v
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14A0085

35-26SERVICE BRAKES - Anti-lock Braking System Troubleshooting
CABS warning light does not illuminate when ignition key is in “START”\
position.
[Explanation]
The ABS ECU uses the IG2
power source which is
turned off in the “START” position. The
ABS
warning light uses the IGl power source which is
not turned off even in the “START” position
.
Consequently, in the “START” position, power is off and the ECU turns the valve relay OFF. If the
warning light does not illuminate at this time, there is trouble in the warning light circuit on the valve
relay side.
MAIN IGNITION
FUSIBLE
LINK @
1440677 Remove and inspect
10 pin connectors of
the hydraulic unit.
W
ith the ignition key in the
No
“ON” position, does voltage
c Harness wire between
HU and warning light is
between body connector broken.
terminal
No.8 and ground
indicate the battery voltage?
Yes
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Is there continuity between ,No
body connector termina
l
. Broken line between HU
No.9 and ground?
and body ground
Remove the valve relay. Is
Nothere continuity between Valve relay malfunction
terminal No. 87a and No. 30?
Replace valve relay. I
HU harness malfunction
IReplace HU.I

35-30SERVICE BRAKES - Anti-lock Braking System Troubleshooting
E-3When diagnostic trouble code “22 STOP SW” is displayed1
[Explanation][Hint]
The ABS ECU outputs this diagnostic trouble codeIf the stop light operates normal, the ABS harness
in the following cases.wire for the stop light switch input circuit to the ECU
lStop light switch may remain on for more thanis broken or there is a malfunction in the ABS ECU.
15 minutes without the ABS functions.
lThe harness wire for the stop light switch may be open.
SUB FUSIBLELINK @
ABSECU
[1121314/5161716~9~10~11~12~13~14~15(16~17~18]~19DOC1122~3~4125l26~27~2~2913013ll3Z~33(341351
Do the stop lights light up
and go out normally?No c Check the stop light re-
lated circuit and repair
problem spots.
Yes
connector and inspectat
the harness side connec-
When the brake pedal is
_NoHarness wire between
pressed forcefully, does the
voltage between connector stop light switch and ABS
ECU is broken.
terminal No. 29 and ground
indicate battery voltage?
c
Repair harness.
Yes r
Malfunction of ABS ECU Replace ABS ECU.
I
14AO683
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35-32SERVICE BRAKES - Anti-lock Braking System Troubleshooting
E-5When diagnostic trouble code “51 VALVE RLY” is displayed
[Explanation]
When the ignition switch is turned ON, the ABSnormal. In addition, normally it monitors whether or
ECU switches the valve relay OFF and ON for annot there is power in the valve power monitor line
initial check, compares the voltage of the signal tosince the valve relay is normally ON. Then, if the
the valve relay and valve power monitor line voltage supply of power to the valve power monitor line is
to check whether the valv
e
relay operation is interrupted, this diagnostic trouble code will output.
IGNITIONMAIN FUSIBLESWITCHLINK @ (IGl)
1440679\/
I
When the valve relay is
checked, are the following
conditions found?
No.85-No.86:resistance
value 60-120 QNo. 30-No. 87a: continuityNo.30-No.87: No continui-
t
y
When battery voltage is ap-
plied between terminalsNo. 86 and No.85
grounded.
No.30-No.87: continuityNo.30-No.87a: no continui-
t
y
Yes
the valve relay and
remove the HU connec-
>
NoValve relay malfunction
I
Replace valve relay. I
With the ignition key “ON”, does the voltage between
No ~
HU power harness wire is
broken?,-
the connector terminal No.12 and ground indicate bat-
tery voltage?I
Repair harness.
YesI
Connect the HU harness
and remove the ECUcon-nector.>
Does resistance betweenNo c Malfunction of harness
body connector terminal between HU and ECU No.2
and terminal No.27
in-
dicate
60-120 ohm?I
I Yes
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Replace ABS ECU.I

MAIN FUSIBLE
LINK @
SERVICE BRAKES - Anti-lock Braking System Troubleshooting35-33
E-6When diagnostic trouble code “52 MOTOR RLY” is displayed
[Explanation][Hint]
The ABS ECU outputs this diagnostic trouble code forIf there is motor operation noise when wheel speed
the motor relay and motor in the following cases.
exceeds Gkm/h (4mph) when starting up after the
l When the motor relay does not function
engine is started, or when there is forced scan tool
lWhen there is trouble with the motor itself and itdrive, there is a broken or short circuited motor
does not revolve
monitor wire.
lWhen the motor ground line is disconnected and
the motor does not revolve
l When the motor continues to revolve Does the motor make a
YesBroken wire or short cir-noise when wheel speed)
1
cuit in motor monitor line
exceeds 6 km/h (4 mph) or1
[ 1 ,2
/ 3 14 15 I6 1 I 18 I9l10l11112113114115116117l1sJ~l9~0~1~2tz3l2~~25t6~27~2~29~~~31~32b3134135/
14A0684
L
Remove the motor relay andcheck resistance values.No. 85-No. 86:resistancevalue 30-60 9No. 30-No. 87: no continui-
Motor relay malfunction
4
Replace motor relay.I
tYBattery voltage is applied onterminals No.85 and No.86grounded.No. 30-No. 87: continuity
Yes
Is pump motor ground con-netted normally? Connect ground wire.
\/i
Does voltage between bodyBroken wire in pump
connector terminal 11 andNo *motor power circuit
ground indicate battery vol-
tage?
1
Repair the harness.
Yes
Connect the HU
tonnetor and remove theECUconnector.
I
Is resistance between bodyNo - Malfunction of harness
connector terminal No. 2 and- between HU and ECU No.26 30-60 ohms?
1 Yes
Is resistance between ECUharness side connector ter- NO
minal No. 5 and ground 0.1 -0.3 ohm?
Yes
ABS ECU malfunction
1 TSB Revision
Replace ABS ECU.

SERVICE BRAKES- Anti-lock Braking System Troubleshooting35-39
AABS warning light does not light at all.1
[Explanation][Hint]
When it does not light up at all, there is a strongIf other warning lighrs do not light up either, fuse is
possibility that there is trouble with ABS warningprobably blown.
light or with power to the light.
MAIN FUSIBLELINK @of
LA
IGNITIONIGNITSWITCH (IG2)SWIT
-Tr-- -z
ABS POWERRELAY
‘IOct:I
1__--------I,7r
.I
:
,\c
AL1-f.
C.
dU
dr-3
gl”pzElzmq
4
4*I
21\5 ,&A27ABS ECU
;(IGI,
1234
7m5670
1
J/B
7
1COMBINATION
1METER
1r2
gizizgl

*
t
GNOGNDVV
*I:
Non-Turbo

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