1989 MITSUBISHI GALANT fuse

ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting 33B-59
Diagnostic
If there is damage or disconnection of the heavy-line illuminates and ‘control is as described in the table
circuit, or a short-circuit, or a malfunction of the
out-
put transistor within the ECU, the alarm ligh
t
below. (Note that the diagnostic is only applicable
up to the compressor relay.)
II/6
Diagnostic No.Attitude controlDamping forcecontrol Vehicle-height
control Switch acceptanceHIGH1 SPORT jAUTO) SOF
T
I44
Rolling control only
Held at
stops. MEDIUMRolling control only stoos.
Not accept
Actuator compulsory activation
CodeNo ’Applicable operation Descnption
of activation
06Return pump relay ON
The return pump relay is compulsorily switched ON for a period of three \
seconds.
ECU terminal voltages (when connector is connected) Terminalvoltage
I
3
2
Return pump relay activation signal
When the return pump relay is ON
B+
When the return pump relay is OFF o
v
During fail-safe ov
(solenoid valve power source relay switch OFF)
Checking the return pump drive circuit (with the connector disconnected\
)
B+: Battery positive voltage Connectron

destrnation or Measurementmeasured part Tester connectron
Check condrtronStandard
32Return pump relay
Resistance32-groundConstatly Approx 750INext apply battery voltage to
terminal 32. Return pump
operation
NOTE (Refer to Vol.2 GENERAL for the circuit diagram.)
Procedures for changing the internal pressure of the low-pressure tank
(1) For 70 kPa (IO psi) or lower
Short-circuit the battery power-source @ terminal to the return pump relay @ terminal in order to activate the return
pump for a few seconds, and then leave as is.
(2) For 140 kPa (20 psi) or higher
Short-circuit the battery power-source @ terminal to the front intake-air solenoid @I terminal and the front right
solenoid @I terminal in order to connect the high-pressure tank and low-pressure ta\
nk, and then leave as is for a few
seconds.
Procedures for changing the internal pressure of the high-pressure tank
(I) For 760 kPa (108 psi) or lower
Short-circuit the battery power-source @I terminal to the discharge-air solenoid (for vehicle-height adjustment)\
@Iterminal, the front intake-air solenoid @I terminal and the front right solenoid @ terminal and the front discharge-air
solenoid @I terminal in order to release the atmosphere inside the high-pressure ta\
nk, and then leave as is for a few
seconds.
(2) For 950 kPa (135 psi) or higher
Short-circuit the battery power-source @ terminal to the compressor relay @ terminal in order to activate the
compressor for a few seconds, and then leave as is.
Troubleshooting hints (mechanical malfunctions)
Malfunctionmode Malfunction probable cause
Malfunction
Note
1
The return pumpThe return pump relay contacts are shorted.
relay is fused The return pump won’t stop, causing the
battery to discharge.
The return pump is The return pump won’t operate due to short-
* Insufficient attitude-control effect.
-
stuck.ing.
etc. l
Vehicle height increases after rolling control.
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336-78 ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
Concentrated junction
Dedicated fuses
@I-@ A-01X Headlight relayA-06X ACTIVE-ECS solenoidvalve power source relay
‘\
I,BR/LB
A-01X
\
8383mB
Sub fusible link 0-a
/
16A0567
ENGINE AND TRANSAXLE
B-l 5 Alternator
B-21 Backup light switchB-02-1 Throttle posltion
sensor (From 1990 models)
Ground point (detailed view)
36A0308
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35-16SERVICE BRAKES - Anti-lock Braking System Troubleshooting
TROUBLESHOOTING (ABS-FWD)
Confirm condition in the following way and diagnose accordingly.
Ioes the ABS warning light illuminate as describedpower to the ABS ECU is interrupted and the
lelow up to the time the engine starts?ABS warning light remains lit because the valve
1) When the ignition key is turned to the “ON” relay is OFF.
position, the ABS warning light blinks twice for (3) When the ignition key is turned from the “START’
approximately 1 second due to the ABS ECU (as position to the “ON” position, the ABS warning
a self check of the valve relays is performed), light blinks twice for approximately 1 second
and goes out and stays out. (during this time a recheck of the valve relays is
2) With the ignition key in the “START” position, performed), and then goes out and stays out.
ABS warning
,,lseq (se+
lightII
OFF -I
Ignitionkey
ABS warnmg/;,ght68A009314A0589
YAS rICONTINUE TO NEXT PAGENo
No.
Trouble condition
ABS warning light does not light up at all.
ABSwarnina
ON
OFF
1light -
lgnltionkey
I14 A0590
When the ignition key is turned to the l Fail safe is functioning due to ECU on-
“ON” position, it remains lighted. board diagnostic
ABSwarning
2lightOZ7
l Short in ECU warning light drive circuit
l Malfunction of ECU
lgnitlonkev
ACC. LOi+14A0591
Does not illuminate when ignition key is
in “START” position.
ABSwarning
3light
Ignition
key ACC. LO:+14AO592
Major causes
l ABS warning light bulb is burnt out.
l Open in ABS warning light electrical circuit (check for blown fuse)
l Malfunction of valve relay
l Break in harness between ABS warn- ing light and HU
l Break in harness between HU and body ground Remedy
Check, using flow
chart A (Refer to
P.35-21.)
Check, using flowchart B (Refer toP.35-24.)
Check, using flow:hart C (Refer to ‘.35-26.)
1 TSB Revision

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

35-22SERVICE 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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