1991 MITSUBISHI 3000GT power steering

33B-4ELECTRONIC CONTROL SUSPENSION (ECS) - TroubleshootingTROUBLESHOOTING
M33EAAE
QUICK REFERENCE CHART FOR TROUBLESHOOTING
SymptomsXS
indicator lightdoes not switch
TROUBLESHOOTING HINTS
“1. The G. sensor is a sensor associated with ride control (detecting pitching, bouncing and rough road). If itfails, therefore, ride control stops.
“2. A self diagnostic decision on the steering angular velocity sensor is made by the ECS control unit which
internally detects the voltages of the two sensor output lines connected to the ECS control unit to detectan open circuit in the signal line. When the signal line is short-circuited or when the power line is
open-circuited, however, it cannot be detected. In a situation where anti-roll control only stops, if
self-diagnosis code No. 21 is not on display, a short-circuited sensor output line or open-circuited sensorpower line is suspected.
“3. The vehicle speed sensor is a sensor associated with attitude controls (anti-dive, anti-squat) and steering
stability controls (anti-roll, high speed sensitive controls). If all these controls stop, therefore, trouble in the
sensor is suspected. The vehicle speed sensor is also in use for operation of the speedometer and for theother electronics controlled systems for the engine, automatic transaxle, etc.
“4. The sensor associated with anti-squat control is the throttle position sensor. The sensor is also used for
control of the engine and automatic transaxle. If the sensor fails, therefore, the check engine light in the
combination meter will light, and engine self-diagnosis code No. 14 will be output. In a situation whereanti-squat control only stops, therefore, if the check engine light does not light, defective wiring is
suspected between the ECS control unit and throttle position sensor.
TSB Revision

Service AdjustmentELECTRONIC CONTROL SUSPENSION (ECS) - Procedures33B-13Fail Safe and Diagnosis List
Output Code
Diagnosis Item
Fail SafeCode No.Indication Pattern
0[Good]
[Good]
l-l
11G sensor defective*l Ride controls (pinching and bouncingcontrol, bad road detection control) sl:op.
21Steering angularvelocity sensor open-circuited*
l Anti-roll control stops.
24Vehicle speed sensor*nn open-crrcurtedl Steering stability controls (anti-roll, high
speed sensitive controls) and attitude
controls (anti-dive, anti-squat) stop.l Shock absorber damping force fixed MEDIUM
F. L. damping forcefl-~-~-j 11c$i;z;;Fr actuator
R. R. damping force
I /
64 j-jMJ-~-~-~ ~t$ec~Z$rn&ftYrrZ& /
NOTE(1)Control stop, warning indication and fixed damping force return to normal when the ignition switch is set to OFF.
When any of the problems marked* occurs, if no subsequent problem occurs (for example, when the problem IStransient) normal operation will be restored even if the ignition switch is not set to OFF.(2)Even if control stop warning indication and fixed damping force return to normal as described above, the
self-diagnosis code’is stored in the memory in the ECS control unrt.
(3)The self-diagnosis code can be force-cleared by use of the MUT or by stopping the power supply to the ECS controlunit. In addition
it is automatically cleared if the ON/OFF control of the ignition swatch is repeated 60 times after the
self-diagnosis code has been output, provided that no new self-diagnosis code is output during the period.TSB Revision

34-24REAR SUSPENSION - Rear Suspension Assembly
REAR SUSPENSION ASSEMBLY
REMOVAL AND INSTALLATION
M34GA-B
L
Rel
145 Nm9- 33 ftlbs.
1. Shock absorber mounting nuts (upper)*
2. ECS connector
*Pre-removal Operationl Removal of the Rear Side Trim Absorber Lid
(RefertoGROUP52A-Trims.)l Removal of the Center Exhaust Pipe and Main Muffler
(Refer to GROUP 15
- Exhaust Pipe and Main Muffler.)
5. Brake caliper*
1,50-60NmI36 - 43 ft.lbs.35 Nm
$8 Nm“?C,ILc. ashwez I,..“=.BP’----12Nm9 ftlbs.
15..e12FO1088. Pressure tube assembly to pipe assembly
connection
<4WS>9. Feed pipe assembly to suction hose connec-
tion
<4WS>10. Return pipe assembly to rubber hose con-
nection t4WS>11. Power cylinder tie rod coupling nut <4WS>*12. Differential carrier to propeller shaft coupling
bolt and nut
Post-installation Operationl installation of the Center Exhaust Pipe and Main Muffler
(Refer to GROUP 15
- Exhaust Pioe and Main Muffler.)
l Installation of the Rear Side Trim Absorber Lid
(Refer to GROUP
52A-Trims.)13. Center bearing mounting nut
14. Harness connector connection
CABS>*15. Parking brake cable and ABS sensor fixingl Refilling and Bleeding of the Power Steering System
(Refer to GROUP
37A- Service AdjustmentProcedures.)bolt
*16. Cable band*
17. Crossmember bracket*
18. Crossmember mounting nut (on differential
side)”19. Rear suspension assemblyl Checking Wheel Alignment
(Refer to P.34-23.)
l Bleeding of 4WS System
(Refer to GROUP 37B
- Service Adjustment
Procedures.)
l Operation Inspection of the 4WS System
(Refer to GROUP 37B - Service AdiustmentProcedures.)
NOTEParts marked with * are symmetrical.
,* Checking the Parking Brake Lever Stroke
(Refer to GROUP 36 -Service Adjustment
Procedures.)i
1 TSB RevisionI

37A-1
STEERING
CONTENTSM37AA-A
POWER STEERING GEAR BOX*....................17Steering Wheel Return to Center
Check................................................................8
POWER STEERING HOSES................................32Tie Rod End Ball Joint Startinq Torque
POWER STEERING OIL PUMP. .._....................28Check. . . . . . . . .._.............................. r . . . . . . . . ..I . . . . . .6Tie Rod End Ball Joint Variation Check
SERVICE ADJUSTMENT PROCEDURES5(Shaft direction)................................................5........
Bleeding............................................................10V-Belt Tension Check........................................8
Fluid Level Check............................................9SPECIAL TOOLS....................................................3Fluid Replacement
............................................9
/
bOil Pressure Switch Check
SPECIFICATIONS2............................12................................................Oil Pump Pressure Test
....................................1 1General Specifications....................................2Stationary Steering Effort Check
....................8Lubricants............................................................3Steering Angle Check
5Sealant and Adhesives....................................3........................................Steering Wheel Centering
6Service Specifications....................................2................................Steering Wheel Free Play Check
....................5STEERING WHEEL AND SHAFT*....................13
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!(I)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 (from
rendering the SRS inoperative).
(2) Service or maintenance of any SRS component or SRS-related component must be performed only at an
authorized 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.

37A-2SPECIFICATIONS
STEERING - Specifications
GENERAL SPECIFICATIONS
M37CA-A
LA,Items
Steering wheel
Steering wheel O.D.
mm (in.)
Gear box
Steering gear type
Power steering oil pump
Oil pump type
Displacementcm3/rev. (cu.in./rev.)
Relief set pressureMPa (psi)
Specifications
390 (15.4)
Rack and pinion
Vane type
9.6 t.59)
8(1,138)
SERVICE SPECIFICATIONSM37CB-A
!msSpecifications
andard value
Steering wheel free play (with engine stopped)
mm (in.)11 (43)
Steering angle
Inner wheel33”45’ 2 2”
Outer wheel28”21’
Tie rod end ball joint starting torqueNm (in.lbs.)
FWD0.5 - 3.0 (4 - 26)
AWDl.O-3.0(9-26)
Stationary steering effortN (Ibs.)35 (8) or less
V-belt deflectionmm (in.)
When belt tension is inspected or readjusted9-11 (.35-.43)
When new belt is installed7 - 8.5 (.28 - .33)
Oil pump pressureMPa (psi)
Pressure gauge valve closed7.5-8.2 (1,067- 1,166)
Pressure gauge valve opened0.8-1.0(114-142)
Oil pressure switch operating pressureMPa (psi)
Oil pressure switch contacts closed (continuity)
1.5-2.0(213-284)
Oil pressure switch contacts opened (no continuity)0.7-1.2(100-171)
Total pinion torqueNm (in.lbs.)0.6-1.3(5-11)
Tie-rod joint swing resistanceN (Ibs.)8-18(1.8-4.0)
Tie-rod joint swing torqueNm (in.lbs.)2-5(17-43)nit
Steering wheel free play (when hydraulic operation)mm (in.) 30 (1.2)
Variation of tie rod end ball joint shaft direction
mm (in.)1.5 i.059)
Oil pump pressure
Pressure gauge valve opened
MPa (psi)1.5 (213)
Space between vane and rotormm (in.)0.06 (0024)
LJ’
I
I
L’l
1 TSB Revision

STEERING -Specifications / Special Tools37A-3
LUBRICANTSM37CD-A
L
/
b
ItemsSpecified lubricantQuantity
Power steering gear box
BearingMITSUBISHI PLUS ATF/Automatic trans-As requiredmission fluid “DEXRON” or “DEXRON II”
O-ringMlTSUBlSHl.PLUS ATF/Automatic trans-As requiredmission fluid “DEXRON” or “DEXRON II”
Oil sealMITSUBISHI PLUS ATF/Automatic trans-As required
mission fluid “DEXRON” or “DEXRON II”
Special tool (MB991 213)MITSUBISHI PLUSATFIAutomatic trans-As requiredmission fluid “DEXRON” or “DEXRON II”
Pinion and valve assemblyMITSUBISHI PLUS ATF/Automatic trans-As required
seal ring partmission fluid “DEXRON” or “DEXRON II”
BellowsSilicone greaseAs required
Power steering oil pump
Power steering fluidMITSUBISHI PLUS
ATF/Automatic trans-0.9 liter (.95 qt.)
mission fluid “DEXRON” or “DEXRON II”
Flow control valveMITSUBISHI PLUS ATF/Automatic trans-As requiredmission fluid “DEXRON” or “DEXRON II”
Friction surface of rotor, vane, cam ringMITSUBISHI PLUS ATF/Automatic trans-As required
and pump covermission fluid “DEXRON” or “DEXRON II”
O-ringMITSUBISHI PLUS ATF/Automatic trans-As requiredmission fluid “DEXRON” or “DEXRON II”
SEALANT AND ADHESIVESM37CE-A
Items
Power steering gear box
End plug screw
Power steering rack support cover screw
Dust cover
Specified sealant and adhesive
3M ART Part No. 8663 or equivalent
3M ART Part No. 8663 or equivalent
3M ART Part No. 8663 or equivalent
SPECIAL TOOLSM37DA.A
ToolNumberNameUseII
MB991 113-01Steering linkage
pullerDisconnection of tie-rod end
MB991 006-01Preload socketMeasurement of the total pinion torqueTSB Revision

37A-4STEERING - Special Tools
easuremen
MB990993-01Power steering oilpressure gauge
adapter (pump side)Measurement of oil pressure
MB991 204
Removal of rack housing needle bearingTSB Revision

STEERING- Power Steering Gear Box
POWER STEERING GEAR BOX
/REMOVAL AND INSTALLATION37A-17
M37PA- -
i
i/
Pre-removal ODerationl Draining of the Power Steering Fluid
(Refer to P.37A-9.)l Removal of Front Exhaust Pipe(Refer to GROUP 15 - Exhaust Pipe1 and Main Muffler.)1l Removal of Transfer Assembly
(Refer to GROUP 22 -Transfer.)
Post-installation Operationl Installation of Transfer Assembly
(Refer to GROUP 22 -Transfer.)
l Installation of Front Exhaust Pipe(Refer to GROUP 15 - Exhaust Pipeand Main Muffler.)l Supplying of the Power Steering Fluid
(Refer to P.37A-9.)l Bleeding of the Power Steering Fluid Line
(Refer to P.37A-IO.)l Checking of Steering Wheel Position with
Wheels Straight Ahead
l Adjustment of the Front Wheel Alignment
(Refer to GROUP 33A-Service AdiustmeniProcedures.)Removt
50 Nm
c40 Nm
29 ftlbs.
/60-70
Nm43 - 51ft.lbs.60-70Nm43 - 51ft.lbs.
36
ft.lb
35 Nm
25 ft.lbs.
15 Nm
11 ftlbs.
18 Nm
lal steps
1. Joint assembly and gear box connecting bolt
2. Cotter pin
3. Tie-rod end and knuckle connecting nut
4. Left member
5. Right member
6. Stabilizer bar bracket
7. Connection of steering gear box with 4WS
oil line
8. Clamp
9. Gear box assemblv
*a 10. Mounting rubber70 Nm51 ftlbs.13FOOE.5TSB Revision