fuse MITSUBISHI GALANT 1989 Service Owner's Manual

35-22SERVICE BRAKES- Anti-lock Braking System Troubleshooting
- N

o
With the ignition key in the “ON” posi-
Check fuse No. 9. If it is
tion. do other warning lights illuminate?
* blown, correct the cause of
the blown fuse and thenreplace the fuse.
I
Yes
Turn the ignition switch OFF and check.
4II., III,
Is the ABS warning light normal? (CheckNo cABS warning light bulb Replace ABS warning
for burned bulb.)burned.* light bulb.
I
Yes
NoThe harness between the
combination meter from
* fuse No. 9 is broken.
1
Repair harness.I
Circuit in combination metercRepair or replace com-
is broken. bination meter.
Yes
Is there continuity between terminals No.NoMalfunction of combination Repair or replace combi-
;,d”,l” No. 17 on the combination meter -meter
nation meter
Yes
Are instrument panel wiring harness, _
Noc Connect connectors firmly.
engine compartment wiring harness,
body wiring harness and ABS wiring
harness connectors connected properly? (Check for pins pulled out or
bent, repair as needed.)
Yes
Broken wire in ECU, valve relay or both
drive circuits. Check and repair both
circuits.
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SERVICE BRAKES -Anti-lock Braking System Troubleshooting35-25
MAINIGNITION
REVERSE SIDE DATA LINK
CONNECTOR
ICONTINUED FROM
PREVIOUS PAGE
III
I-
Can other electronic control _ No . Scan. tool related mal-systems communicate with
scan tool?Fhnc;;n. Repair
and re-
Yes
No c Correct cause of blown
fuse and replace fuse.
With the ignition key in the
_No) Is power relay normal?
“ON” position, does

,thf(Refer to P.35-74.)
;;I;; relay make a click
Disconnect ECU connector
and check harness connec-
tor.
I
14A0667
Yes
W
ith the ignition key in the
“ON” position, does voltage
between ECU connector ter-
minal No. 18 and ground in-
dicate the battery voltage?
Yes
Is there continuity between
body harness terminals
No. 9, No. 20 and No. 34, and
ground?
ECUground line broken
Yes
tpNo
Is there continuity betwee
n
Harness wire between
body harness connector
ter-data link connector and
minals
No.23 and No.24, andABS ECU is broken.
f2;;k connectors No.4 &
I
Repair harness.
Yes
Malfunction of ABS ECU Replace ABS ECU.
1
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35-34SERVICE BRAKES - Anti-lock Braking System Troubleshooting
TROUBLESHOOTING (ABS-AWD)
Confirm condition in the following way and diagnose accordingly.
c
P
t:
1
-)oes
the ABS warning light illuminate as described
elow up to the time the engine starts?
1) When the ignition key is turned to the “ON”
position, the ABS warning light blinks four times
for approximately
1 second due to the ABS ECU
(as a self check of the valve relays is performed),
and goes out and stays out.
2) W
ith the ignition key in the “START” position,
power to the ABS ECU is interrupted and the ABS warning light remains lit because the valve
relay is OFF.
(3) When the ignition key is turned from the “START’ position to the “ON” position, the ABS warning
light blinks four times for approximately
1
second (during this time a recheck of the valve
relays is performed), and then goes out and
stays out.
,,,\~~\l’l”“F’,r//,,,l/,,
a+’4 4 5r’o, (j /z$$+3,,,,%&73,
:
f=&L-gy
82
1cJz
x 1000
rimonUILEAED nxL GNL”Oyg@O@~ 2F
ABS
warnmg’l~ght66A0093
ABS warning
lightONI
OFF
Ignitionkey
ACC, LOCK
114AO594
YesCONTINUE TO NEXT PAGENo
1
No.Trouble condition
ABS warning light does not light up at all.
1
ABSwarning
light
Ignition
keyACC, ON
OFFLOCK 1
I
When the lgnltlon
key IS turned to the
“ON” position, it remains lighted.
ABS warnina
ON , l Short in ECU warning light drive circuit
l Malfunction of ECU
-“l-l- -III
ignitionkey
ACC. LO!?-14AO591
Major causes
l ABS warning light bulb is burnt out.
l Open in ABS warning light electrical circuit (check for blown fuse)
l Fail safe is functioning due to ECU on-
board diagnostic
Does not illuminate when ignition key is
in “START” position. l Malfunction of valve relay
l Break in harness between ABS warn-
ing light and HU
l Break in harness between HU and
14AO595
Remedy
Check, using flow
chart A (Refer to
P.35-39.)
Check, using flow
chart B (Refer toP.35-42.)
1 2 /light
-
Check, using flow
chart C (Refer to
P.35-44.)
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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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SERVICE BRAKES - Anti-lock Braking System Troubleshooting
W
ith the ignition key in the “ON” posi- No
Check fuse No. 9. If it is
tion, do other warning lights illuminate? blown, correct the cause of
-T-
Yesthe blown fuse and then
replace the fuse.I
Remove the combination
meter, and check with
the ignition key “ON”.
I
Does voltage between har-NoThe harness between the ness
connector terminal
No. 8 and ground indicate
-combination meter from
fuse No. 9 is broken.
battery voltage?
I
Yes Repair harness.
Circuit in combination meter
is broken.
L Repair or replace com-
bination meter.
Turn the ignition switch OFF an
check.
I
Is the ABS warning light normal? (CheckNo
for burned bulb.)c A$Eedyrning light bulb
,
c Replace ABS warning
light bulb.
Yes
Is there continuity between terminals No. No -
8 and 4” or 17’2 on the combinationI Malfunction of combinatio
n
meter
I Repair or replace combi-
meter side? nation meter
Are instrument panel wiring harness, No
-~
engine compartment wiring harness, . Connect connectors firmly.
body wiring harness and ABS wiring
(Check for pins pulled out or
harness connectors connected properly? bent, repair as needed.)
I
1 Yes
I
Broken wire in ECU, valve relay or both
drive circuits. Check and repair both
circuits.
I
NOTE‘1: Non-Turbo . Turbol *:Non-Turbo
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SERVICE BRAKES - Anti-lock Braking System Troubleshooting35-43
MAINFUSIBLELINK @
IGNITION
KgCHm

l
CONTINUED FROM
PREVIOUS PAGE
CONNECTOR
t ,
Is there continuity betweenNo FHarness wire between
body harness connector
ter-data link connector and minals

No.23 and No.24, andABS ECU is broken.
data link connectors No.4 &No.1 O?I
Repair harness.
Yes
I
1 Malfunction of ABS ECUI1-4 Replace ABS ECU.III1
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1 Yes
No - Correct cause of blown fuse and replace fuse.
r
L
W
ith the ignition key
in theNo ~ Is power relay normal?
“ON” position, does the (Refer to P.35-74.)power relay make a “click”noise?
YesNoYes
tI ,
Disconnect ECU connector
and check harness connec-
tor.t
Replace power relay.1
W
ith the ignition key in the
NoHarness wire between
“ON” position, does voltage- power relay and ECU is
between ECU connector ter-
broken.
minal No. 18 and ground in-
dicate the battery voltage?
4
Repair harness.
Yes
tp
Is there continuity betweenNoECU ground line broken
body harness terminal
s
No.9
and No. 34, and
c
ground?Repair harness.I
Yes

35-44SERVICE BRAKES - Anti-lock Braking System Troubleshooting
CABS warning light does not illuminate when ignition key is in “START”\
position.I
[Explanation]
The ABS ECU uses the IG2 power source which isand the ECU turns the valve relay OFF. If the
turned off in the “START” position. The ABS
warning light does not illuminate at this time, there
warning light uses the IGl power source which is is trouble in the warning light circuit on the valve
not turned off even in the “START” position.
relay side.
Consequently, in the “START” position, power is off
KLlh-0u
:LEIGNITIONSWITCH0(IGl) 0
Es10
1
7IIIIIII
I
I!
: Non-Turbo
.
TurboI: Non-Turbo 1
Remove the fuse fo
power source of the
ABS power relay in the
junction block and switch off ABS-ECU.
l Remove and inspect
10 pin connectors ofthe hydraulic unit.
“ON” position, does voltage
between body connector
terminal
No.8 and around1indicate the battery vcltage?
b!$%iii&Broken line between HUand body groundI
Yest
Remove the valve relay. Is - Nothere continuity between Valve relay malfunction
terminal No. 87a and No. 30?I
Yes[Replace-relay
HU harness malfunction
IReplace HU.I
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SERVICE BRAKES -Service Adjustment Procedures35-75
14AO197
FLAT BATTERY REMEDYM35FOAF
When booster cables are used to start the engine when the
battery is completely flat and then the vehicle is immediately
driven without waiting for the battery to recharge itself to
some extent, the engine may misfire, and driving might not be
possible. This happens because A.B.S. consumes a great
amount of current for its self-check function; the remedy is to
either allow the battery to recharge sufficiently, or to remove
the fuse for A.B.S. circuit, thus disabling A.B.S.
The A.B.S. warning light will illuminate when the main fusible
link (for A.B.S.) is removed.
After the battery has sufficiently charged, install the main
fusible link (for A.B.S.) and restart the engine; then check to be
sure the A.B.S. warning light is not illuminated.
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BRAKE FLUID PRESSURE SWITCH CHECK
hl35FOAL
(1) Disconnect the hydraulic pressure switch connector.
(2) Check the continuity between the terminals of hydraulic pressure switch.
Condition Between terminals
Brake pedal not depressed
No conductance
Brake pedal depressed lightlyNo conductance
Brake pedal depressed
stronglyConductance