1991 MITSUBISHI 3000GT relay

SERVICE BRAKES -Anti-lock Braking System Troubleshooting
35-35
IGNITIONSWITCH(IG2)
R&RRELAY
DIODE
KX35-AK-R35028PREVIOUS PAGE
With the ignition key in the
“ON” position, does voltage
between ECU connector
terminal No. 18 and ground
indicate the battery voltage?
Is there continuity between
body harness terminals No. 9
and No. 34, and ground?
Repair harness.
vNoIs there continuity between-body harness connector ter-diagnosis inspection
minals No. 23 and No. 24,terminal and ABS ECU
and diagnosis inspection ter-
minals No. 4 & No. 1 O?Yes
”Malfunction of ABS ECU
Replace ABS ECU.
TSB Revision

35-36\
SERVICE BRAKES -‘\Anti-lock Braking System Troubleshooting
CABS warning light does not illuminate when the ignition key is in the “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
IG, power source which is
not turned off even in the “START” position.
Consequently, in the “START” position, power is off
LJand 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.
EfiE-
9B
wIGNSW1--
J/BF
COMBINATIONMETER
G-R 11 G-
IN;IGl)
ITSB IRemove the hydraulic
unit (HU) connector andcheck.
Yes
c-No -Is there continuity between-> Broken line between HUbody connector terminal No. 9
and body ground
and ground?
-No 7Is there continuity between> Valve relay malfunction orHU connector terminal No. 8
break in HU harness wire
and terminal No. 9?
YesYes
&
Replace valve relay.I
1
HU harness malfunctionj Replace HU.
NOTEWhen performing the check marked *, note polarity of the diode
(refer to the circuit diagram).
visionI

SERVICE BRAKES -Anti-lock Braking System Troubleshooting35-37
DABS warning light blinks once after the ignition key is turned to the “ON” position. It
Lilluminates in the “START” position and blinks once again when turned to the “ON” position.
[Explanation]
1 sec. while itharness between the ECU and the warning light, the
light illuminates only when the valve relay is off in
performs a valve relay test. If there is a break in the
the valve relay test, etc.
IGNITIONSWITCH(IG1)I
J/B
F
2
r+im
md
/
L/
COMBINATION
METER
ABS-ECU-____
KK35-KK-It3503In the ignition key “ON”
position, does voltage
between terminal No. 25 and
ground indicate battery
voltage?ABS warninglight and
Yes
Repair harness.
vMalfunction of ABS ECU
+ Replace ABS ECU.
TSB Revision

SERVICE. BRAKES -Anti-lock Braking System Troubleshooting35-43
E-6When diagnosis code “51 VALVE RELAY” is displayed
I
L[Explanation]
When the ignition switch is turned ON, the ABS
normal. 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. If the supply of
the valve relay and valve power monitor line voltagepower to the valve power monitor line is inter-
to check whether the valve relay operation is
rupted, this trouble code will be output.
b
L
IGNlTIONSWITCH(IG1)
-I--
iz
=pi7TEaq
dI
6
7
Ed
COMBINATION
METER
--;Gm1 I 11
I /I
--- --
710 4Ii+
mI%
~d10 2
--- -- -?
ii3Dz62 27
iE b
1112j31a15(6/71618/10(11112113/14/15j16/17(18118~20~21~2~3~4~5~~~2@~~~0~31~2~3~~~35
KX35-AK-K3503
r-TSB I
( ;;reove;d ch; the>
4.IWhen the valve relay is checked,
are the following conditions
found?
No. 85
- No. 86: Resrstance
value 60 - 120 IINo. 30-No. 87a: Continuity
No. 30 - No. 87: No continuity
When batterv voltaoe IS aooliedbetween terminalsho. 86 and
No. 85.
No. 30
- No. 87: Contrnurty
No. 30 - No. 87a: No continurtyNo
I1-----+Valve relay malfunction
+l
IReplace valve relay.I
Yes
&I/ No1IWith the ignition key “ON”,
does the voltage between the
connector terminal No. 52 and
ground indicate battery voltage?
Yes
Connect the HU harness and
\ remove the ECU connector.
+II NnrIground Indicate battery voltage.
Replace ABS
ECIJ.
vision

35-44SERVICE BRAKES -Anti-lock Braking System Troubleshooting
E-7When diagnosis code “52 MOTOR RELAY” is displayed
[Explanation]
The ABS ECU outputs this trouble code for the
motor relay and motor in the following cases.
l When the motor relay does not function
lWhen there is trouble with the motor itself and it
does not revolve
lWhen the motor ground is disconnected and the
motor does not revolve
l When the motor continues to revolve
[Hint]
If there is motor operation noise during MUT forced
drive mode, there is a broken or short circuited
motor monitor wire.
FUSIBLE LINKa
=
::
s* m’ IL% Q7
plGizq”+-103 1
----..-___I _-
3%ECU2526L--h h
Th v-sTIII
14 ’
+---I
i”
’-ll21314 15 16 17 16 ~8~10)11~12~13~14~15~16~17~16~li1Q~0~1~~23~4~*6~2?~E~Q~30~1~2~33~~~5J
X35-AK-R3500during MUT forced drive mode?
Remove the motor relay.
I
1 ;;pa4r&&rness between 1
5Remove the motor relay and
check resistance values.
No. 85
- No. 86: Resistance
value 30 - 60 fiNo. 30 - No. 87: No continuity
Battery voltage is applied
kotw8esfn terminals No. 85 and
No. 30
- No. 87: ContinuityReplace motor relay.
1Yes
L
+I, NoIIIs pump motor ground connected
normally?Connect ground wire.
I
YesInstall motor relay and remove
HU connector.
@Vyiground indicate battery voltage?
I Yes
IConnect the HU connector
and remove the ECU connectorRepair harness.
J- No
Is resistance between bodyP Malfunction of harness
connector terminal No. 2
Lrbetween HU and ECU
and No. 26 30 - 60 a?
ItNc-11 I<
r 1 Repair harness.;~~:;$$a$?%dABS ECU malfunction
> Replace ABS ECU.
TSB Revision

When energized
Between terminals 4 and 5Continuity
When de-energized
Between terminals 4 and 5\i fl \\ 16FO264No continuity
Between terminals 1 and 3Continuity
16FO122L--J18FOCII
SERVICE BRAKES - Service Adjustment ProceduresI
INSPECTION OF POWER RELAYM35FOAP
7
1.Remove the relay box cover in the engine compartment and
remove the power relay.
2. Apply the battery voltage to the terminal @ and check for
‘L-J1
continuity between the following terminals when the
terminal @ is short-circuited to ground.
35-62
14FOOS14FOO8
l-TSB
1
REMEDY IN CASE OF DISCHARGED BATTERY
M35FOAQIf the engine is jump-started, because of a completely
discharged battery, the vehicle may suffer misfiring and fail to
start if an attempt is made to start without allowing the battery
to recover sufficiently. This is because the ABS consumes a
great deal of current for its self check. In such a case, allow the
battery to sufficiently charge or remove the ABS power relay in
the engine compartment to disable the ABS. Removing the
ABS causes the ABS warning light to light. After the battery is
charged sufficiently, install the power relay and restart the
engine to check that the ABS warning light goes out.
INSPECTION OF VALVE RELAY AND MOTOR
RELAY (ABS)M35FOAR1. Remove the splash shield
(FR) and remove the relay box
cover by inserting a screwdriver between the hydraulic unit
and cover to pry off the lock.
2.Remove the relays. The one closest to you (larger one) is
the motor relay and the one farthest from you (smaller one)
is the valve relay.
‘d~ i
wision

SERVICE BRAKES - Service Adjustment Procedures35-6316R067C
16R06703. Check continuity of the relays both when they are ener-
gized and de-energized.
Motor Relay
When de-energizedBetween
termrnals @30-600and@When energized
between terminals
@and@Between
termrnals @
and @
Between terminals @
and @No contrnurty(mmContinuity
(approx.
ORI
vVhen de-energizedBetween terminals @60-120~~and QBetween terminals @
and
@IContinuity
(approx. On)Between terminals @
and @
flo;rntinuityccWhen energizedBetween terminals @and
oetween terminals@
yo;;ntinuityco
@and@Between terminals @ andContrnuity@(approx. OR
1 TSB Revision

35-86SERVICE BRAKES - Hydraulic Unit (ABS)HYDRAULIC UNIT (ABS)
REMOVAL AND INSTALLATION
I
M350A.ARemoval steps
4*1. Brake tube connection
2. Harness connector connection
3.Bracketbolt4*4. Hydraulic unit (with bracket)
5. Hydraulic unit bolt
6. Grounding wire connection
1Flared brake line nuts
/15 Nmllftlbs. 14FO33
Pre-removal Operationl Removal of Splash Shieldl Draining of Brake Fluidl Removal of Relay Boxl Removal of Air DuctInstallation steps
l a6. Grounding wire connection
5. Hydraulic unit bolt initial tightening
4. Hydraulic unit (with bracket)
3. Bracket bolt
2. Harness connector connection
** 1. Brake tube connection19FO127
TSB Revision