relay MITSUBISHI 3000GT 1991 Repair Manual

AUTOMATIC TRANSAXLE - Troubleshootinn23-43
CONVERTER STALL TESTStall test consist of determining maximum engine
speed obtained at full throttle in “D” and
“I?”positions. This test checks torque converter
statoroverrunning clutch operation, and holding ability of
transaxle clutches and low-reverse brake.
Caution
During this test, make sure that no one stand in
front of or behind vehicle.
1. Check transaxle fluid level. Fluid should be at
normal operating temperature
[70 - 80°C (160 -
18O”F)I. Engine coolant should also be at normal
operating temperature
[80 - 90°C (180 - 19O”F)l.2. Apply chocks to both rear wheels.
3. Attach engine tachometer.
4. Apply parking and service brakes fully.
5. Start engine.
6. With selector lever in “D” position, depress
accelerator pedal fully to read engine maximum
rpm. Do not hold throttle wide open any longer
than is necessary to obtain maximum engine
rpm reading, and never longer than 5 seconds at
a time. If more than one stall test is required,
operate engine at approximately 1,000 rpm in
neutral for 2 minutes to cool transaxle fluid
between tests.
Stall speed: 2,200
- 3,200 rpm
7.Place selector lever to “R” position and perform
stall test by the same procedure as in foregoing
item.
Stall Speed Above Specification in “D”
If stall speed is higher than specification, rear clutch
or overrunning clutch of transaxle is slipping. In this
case, perform hydraulic test to locate cause of
slippage.
Stall Speed Above Specification in “R”
If stall speed is higher than specification, front
clutch of transaxle or low-reverse brake is slipping.
In this case, perform hydraulic test to locate cause
of slippage.
Stall Speed Below Specification in “D” and “R”
If stall speed is lower than specification, insufficient
engine output or faulty torque converter is sus-
pected. Check for engine misfiring, ignition timing,
valve clearance, etc. If these are good, torque
converter is faulty.
TRANSAXLE CONTROL
Symptom
Selector lever operationis stiff
Probable cause
Incorrect adjustment of sleeve
Remedy
Adjust
Incorrect adjustment of control cable
Excessive wear of detent plate
Worn contact surfaces of pushbutton
and sleeve
Adjust
Replace
Replace
Starter motor does notMalfunction in inhibitor switchReplace
operate with the selector
lever in the “N” or “P”Incorrect adjustment of control cableAdjust
position
Will not shift to
4-speed
Malfunction of starter relay
Malfunction of OD switchReplace
Replace
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33B-22 ELECTRONIC CONTROL SUSPENSION (ECS) - Circuit Diagram
CIRCUIT DIAGRAMM33ZEAB
TAILL-_
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FUSIBLE LINK@J/B
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ELECTROMIC CONTROLSUSPEldSiOi,dCONTRllL Ui'dIT
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SELF-DIAGNOSISCXECK COKNECTOR
X35-AX-Bi?Gl-E,TSB Revision

L,
SERVICE
BRAKES
CONTENTSM35AA..
ANTI-LOCK BRAKING SYSTEM TROUBLESHOOTING7Actuator Test Function
. . . . ..___..._____.__................................ I 2, 36Check Using Self Diagnosis Function __._.....,_._.._____........ 11, 28
Diagnosis Code Chart ..,,........,......_..................................,. 1 I, 28
How to Use the Troubleshooting Flow Chart
_____.___......._._.7Method of Clearing Diagnosis Code Memory._.,._...... 12, 30
Particular Phenomena of the Anti-lock Braking System
7Troubleshooting (ABS-AWD) ._______._.._...........................,... 26
Troubleshooting (ABS-FWD) ______.._._........_...........,.....,.....,....8
TroubleshootingMethods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
BRAKE LINE . . . . . . .._.......................................................................71
BRAKEPEDAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
ELECTRONIC CONTROL UNIT (ABS). . . . .._._..___..__._............93/
L
FRONT DISC BRAKE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73G SENSOR (AWD-ABS)’
____.____.___.__._._.................,,......,.....,.... 92
HYDRAULIC UNIT (ABS) .___.._._._._.______.............,...,,..........~ .,_____86
MASTER CYLINDER AND BRAKE BOOSTER ..__.._____.._____67SPECIFICATIONS ._....._.___.....................................
REAR DISC BRAKE . . . . . . .._..._._.___................................................81
SERVICE ADJUSTMENT PROCEDURES..___........45Bleeding48
Brake Booster Operating Inspection.
46
Brake Drum Inside Diameter Check. . .56
BrakeFluidLevelSensor Check.46
Brake Lining and Brake Drum Connection Check56Brake
Linrng Thickness Check............................................Brake Pedal Inspection and Adjustment............................Check Valve Operation Check............................................Front Brake Disc Run-out Check........................................Front Brake Disc Run-out Correction................................Front Disc Brake Pad Check and Replacement................Inspection of Front Brake Disc Thickness........................Inspection of Hydraulic Unit................................................Inspectton of Power Relay....................................................Inspection of Valve Relay and Motor Relay (ABS)............Measurement of Wheel Speed Sensor Output Voltage
Proportioning Valve Function Test
....................................Rear Brake Disc Run-out Check........................................Rear Brake Disc Run-out Correction................................Rear Brake Disc Thickness Check....................................Rear Disc Brake Pad Check and Replacement................Remedy in Case of DischargedBattery............................56
45
46
52
53
48
5258
62
62
57
47
55
55
55
53
62
SPECIAL TOOLS ..__.......___..........................................................General Specifications
........................................................Lubricants............................................................................Sealants and Adhesives........................................................Service Specifications........................................................3
TROUBLESHOOTING............................................................5
WHEEL SPEED SENSOR (ABS)............................................88
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
(1)A Supplemental Restraint System (SRS), which uses a driver-side air bag, has been installed in the 3000GT.(2)The SRS includes the following components: impact sensors, SRS diagnosis unit: SRS warning light, air bagmodule, clock spring, interconnecting wiring. Other SRS-related components (that may have to be
removed/installed in connection with SRS service or maintenance) are indicated in the table of contents byan asterisk (*).
WARNING!(1)Improper service or maintenance of any component of the SRS, or any SRS-related component, can lead to
personal injury or death to service personnel (from inadvertent firing of the air bag) or to the driver (fromrendering the SRS inoperative).
(2) Service or maintenance of any SRS component or SRS-related component must be performed only at anauthorized MITSUBISHI dealer.
(3) MITSUBISHI dealer personnel must thoroughly review this manual, and especially its GROUP 52B
-Supplemental Restraint System (SRS), before beginning any service or maintenance of any component of theSRS or any SRS-related component.
i

35-8SERVICE BRAKES -Anti-lock Braking System Troubleshooting
TROUBLESHOOTING (ABS - FWD)Confirm condition in the following way and diagnosis accordingly.
Does the ABS warning light illuminate as described
(2) With the ignition key in the “START” position,
below up to the time the engine starts?power to the ABS ECU is interrupted and the
(1) When the ignition key is turned to the “ON”ABS warning light remains lit because the valve
position, the ABS ECU causes the ABS warningrelay is OFF.
light to flash twice in about one second (during
(3) When the ignition key is returned from the
which the valve relay self check is made) and“START” position to the “ON” position, the
then causes it to go out.ABS warning light flashes twice in about one
second (during which. the valve relay self check
-is made again) and then goes out.
ABS warning
ONlightII
-I
keyACC,
LO!: +--14A0589
Yes>CONTINUED ON NEXT PAGE
No
”
weenABS warning
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SERVICE BRAKES -Anti-lock Braking System Troubleshooting
L’
No.Trouble condition\4
After the ignition key is turned to the
“ON” position, it blinks once and then
illuminates when it is turned to the
“START” position. When the key is
returned to the “ON” position, the light
blinks again. (Blinking with the ignition
key in the “ON” position is synchronized
with operation noise of the valve relay.)
ABSwarninglight
key ACC. L::+
Ignition
14A05931 CONTINUED FROM PREVIOUS PAGE
1Major causes
l Break in harness for ECU warning
light drive circuit
l Malfunction of ECU
Does the ABS warning light illuminate
when starting to drive the car?
iIs there one-sided braking, insufficient
>CONTINUED ON NEXT PAGEI
I
YesTrouble condition
One-sided braking
Insufficient braking force
ABS sometimes functions even when
there is no sudden braking.
(ABSoperation vibration is transmitted.)Remedy
Check, using flow
P.35-19.)Remedy
l Check HU operation and, if
l necessary, replace HU.
If HU is normal, check struc-
l
HydraJicl Malfunction in HU solenoid valvetural parts for normal
braking.
Insufficient wheel speed sensor put voltage (sensor malfunction, too
large a gap between sensor rotor,
l Malfunction of ABS ECU(Refer to
P.35-57.) and, if
necessary, replace sensor,
If tests indicate that there are
no mechanical or electricalfaiIures,replace the ECU.
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SERVICE BRAKES -Anti-lock Braking System Troubleshooting
35-11
Adapter
iarness%f&(MB9913771(Mi3991341)\12FOO57
CHECK USING SELF DIAGNOSIS FUNCTION
(1) With the ignition switch OFF, connect the MUT through the
adapter harness
(MB9913771, turn the ignition ON and
select the ABS system. (The ABS warning light lights up, it
goes into the MUT mode. In the MUT mode, ABS does
not function.)
If it does not go into the MUT mode, check the ECU power
circuit and the harness between the ECU and diagnosis
check terminals.
(2) Read the diagnosis output codes from the ECU memory.
(3) Clear the diagnosis codes once from memory. (Refer to
P.35-12.)If the memory cannot be cleared, the ECU is currently
detecting the trouble and the ABS ECU is in fail safe. If it
can be cleared, the trouble is either temporary or appears
only when driving.
(4) When the trouble codes cannot be cleared, or when the
ABS ECU goes into fail safe during another test drive and
trouble codes are output, check according to trouble code
check charts (E-l-E-6).
DIAGNOSIS CODE CHART
Diagnosis codeCheckReferenceDiagnosis codeCheck
Referencechart namepagechart namepawNo. MUT display lettersor remedyNo. MUT display lettersor remedy
L11FR SNSR. OPEN41FR SOL. VALVE
12FL SNSR. OPEN42FL SOL. VALVEE-4P.35-23E-lP.35-2013RR SNSR. OPEN43REAR SOL. V.
14RL SNSR. OPEN51VALVE RELAYE-5P.35-24
15VEH. SPD. SNSR.E-2P.35-20 52MOTOR RELAYE-6P.35-25
22STOP LAMP SWE-3P.35-2055 CONT. UNITECU-
replacementI
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.SERVICE BRAKES -Anti-lock Braking System Troubleshooting35-13 'A ABS warning light does not light at all.
iJ[Explanation][Hint]
When it does not light up at all, there is a strongIf other warning lights do not light up either, fuse is
possibility that there is trouble with ABS warningprobably blown.
light or with power to the light.
id
r
f%ER RELAY
110
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6
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IGNITIONSWITCH(IG2)m!--
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IN:IGl)-
59
1
ki@iNATION
iB
ABS-ECU
Kxss-AK-RSGOIA
1 TSB RevisionI

SERVICE BRAKES- Anti-lock Braking System Troubleshooting
Yes
Turn the ignition switch OFF and
check.
4- No
Does voltage between
harness connector terminal
No. 14 and ground indicate
battery voltage?combination meter from
fuse No. 11 is broken.
Yes
ylCircuit in combination meter
is broken.
Is there continuity between combination
meter No. 58 and No 59 terminals7
.rT/“I./ Faulty1 +I[&
r,No ,IAre instrument panel wiring harness
and body wiring harness connected
properly?Connect connectors firmly.
(Check for pins pulled out or
bent, and repair as needed.)
Yes
Broken wire in ECU, valve relay or both
drive circuits. Check both circuits.
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SERVICE BRAKES -Anti-lock Braking System Troubleshooting35-15
ICheck ABS ECU.Remove the ECU connector and
check.Does the voltage between ECU harness
connector terminal No. 25 and ground
indicate battery voltage while the
ignition key is in the “ON” position?
Yes
b Broken wire between ABS
warning light and ECU) Repair harness.
I ABS ECU malfunctionI) Replace ABS ECU.
Is valve relay normal? (Refer to
P.35-62.)Yes+ Valve relay malfunctionb Replace valve relay.
install the valve relay, remove the HU
connector and check.
IDoes voltage between theINO IHU harness\----+I Broken harness wireII1-1 Repair harness.I
Iconnector terminal No. 8 and ground
indicate battery voltage while the
ignition key is in the “ON” position?between ABS warning
light and HU1IYes
Is there continuity between HU harness
4:~~&?$?%$&ndconnector terminal No. 9 and ground?
Is there continuity between HU harness
connector terminals No. 8 and No.
9?
j HU malfunctionI> Replace HU.
Yes
L Connector not connected
securely., Replace connector.I
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SERVICE BRAKES -Anti-lock Braking System Troubleshooting3547CONTINUED FROM
PREVIOUS PAGE
ABS
POSER
RELAY
DIODE
SELF-LM&OS'S
CONNECTOR
FRONT
SIDEYes
Is power relay normal?
(Refer to
P.35-62.)
-Replace power relay.
With the ignition key in the
“ON” position, does voltage
between ECU connector
terminal No. 18 and ground
indicate the battery voltage?
I
1YesNo
-
I--Harness wire between
power relay and ECU
is brokenJ1Repair harness.
I
~ No
Is there continuity betweenrbody harness connector ter-agnosis inspection ter-
minals No. 23 and No. 24,minal and ABS ECU is
and diagnosis inspection ter-
minals No. 4 & No. 1 O?Yes
”Malfunction of ABS ECUReplace ABS ECU.
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