1991 MITSUBISHI 3000GT ABS

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ELECTRONIC CONTROL SUSPENSION (ECS) - Specifications33B-3
Items
Shock absorber
Type
Max. lengthmm (in.)
Min. lengthmm (in.)
Strokemm (in.)
Damping force at 0.3 m/seeI.9 ft.)/sec.N (Ibs
Expansion
Hard
Medium
Soft
Contraction
Hard
Medium
Soft
Stabilizer bar
Mounting method
Outside dia.
mm (in.)FWD
IAWDI
Hydraulic, cylindrical double-acting type
515(20.3)610(24.0)
356(14.0)407(16.0)
159
(6.3)203(8.0)
1,800(397)
1,200(265)
550(121)
950(209)
850(187)
850(143)
10 (.37)
Pillow ball type
M33CB-B~SERVICE SPECIFICATIONS
Rear suspension1'FWDItemsFront suspension
Standard value
Camber0” + 30’0”
k 30’- O”10’ Ik 30’
Caster3”55’ t 30’
Toe-inmm(in.)0+3(0f.12).522.5(.02+.I).5k2.5
SPECIAL TOOLS
ToolNumber
MB991 341
Name
Multi-use tester
sub-assembly
MB991 359ROM packM33DA-B
Use
Inspection of electronic control suspension
system
l Reading and erasing self-diagnosis codesl Reading service datal Actuator testTSB Revision

33B-8ELECTRONIC CONTROL SUSPENSION (ECS) - Troubleshooting
III
1 4 1 When diagnosis code Nos. 61, 62, 63 and 64 are output.
(-yesUsing MUT, check actuator. (Referto P.33B-15.) Good?
No
Remove cap at top of shock absorber
associated with diagnosis code No.,
disconnect connector directly
connected to shock absorber, and
checkharness connector with
ignition switch at ON.r
~...- NoNo. 1 and 3 terminal voltages upto specification?Standard: 5 V
YesIs continuity provided across the following areas of shock
Lsorber associated with diagnosis code No.?Between shock absorbers and ECS control unit
Between No. 1 and 7 terminals of F.R. shock absorber
Between No. 3 and 6 terminals of F.R. shock absorber
Between No. 1 and
10 terminals of F.L. shock absorber
Between No. 3 and 9 terminals of F.L. shock absorber
Between No. 1 and 13 terminals of R.R. shock absorber
Between No. 3 and 12 terminals of R.R. shock absorber
Between No. 1 and 16 terminals of R.L. shock absorber
Between No. 3 and 15 terminals of R.L. shock absorber1
YesNo
””
Is continuity provided between
rTi”’
Correct harness (between No. 2 and 4 terminals of shockabsorber and ground).No. 2 and 4 terminals and ground?
age, force-drive actuator by MUT. IsStandard: 9 V during forced drive
Yes
+Is continuity provided across the following areas of shockabsorber associated with diagnosis code No.?
shock absorbers and ECS control unit
Between No. 5 and 5 terminals of F.R. shock absorber
No. 5 and 8 terminals of F.L. shock absorber
No. 5 and 11 terminals of R.R. shock absorber
No. 5 and 14 terminals of R.L. shock absorber
I
YesNo
Is trouble corrected by replacingshock absorber (including dampingforce changeover actuator and POSI-tion detection switch) associated
Yes
1
EndTSB 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

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ELECTRONIC CONTROL SUSPENSION (ECS) - ;;~i%:~ustment339-15
Item No.Check
PointCheck ConditionSoundness Determination Value
24
Check by actually operating
vehicle.Speedometer indication and
MUT indication coincide.
26
61
62
63
64Vehicle
speed
sensorstop
lightswitch
F.R.actuator
F.L.actuator
R.R.actuator
R.L.actuatorDepress brake pedal.
ON
Do not depress brake pedal.OFF
Tour mode with vehicle stationarySOFT
Sport mode with vehicle stationaryHARD
Tour mode with vehicle stationarySOFT
Sport mode with vehicle stationaryHARD
Tour mode with vehicle stationarySOFT
Sport mode with vehicle stationaryHARD
Tour mode with vehicle stationarySOFT
Sport mode with vehicle stationaryHARD4. ACTUATOR CHECK
(I) Using the MUT, force-drive the actuator and fix the damping force changeover.
(2) Check service data (Item No. 61 through 64) to verify that the actuator has been force-driven.
NOTE
lAll of the four actuators in the shock absorbers are simultaneously changed over by forced drive.
lThe damping force changed over and fixed by forced drive is cleared by the following three conditions.1. Ignition switch OFF
2. Vehicle speed 3 km/h (1.9 mph) or more
3. MUT disconnected
Actuator Check List
Item No.Check Point
Check ConditionMUT Service Data Item
No. 61 - 64 Indicated
01Damping force SOFT
03Damping force MEDIUM
04Damping force HARD
Vehicle in stationary
conditionSOFT
MEDIUM
HARD
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TSB Revision

33B-18ELECTRONIC CONTROL SUSPENSION (EC9 - ~::::u:?‘s*men*
\/I
I(Front)(Rear)I
12FOOG
6. ACTUATOR OPERATION CHECKM33FJAA
6-1. Actuator Operating Sound Check
(I) Set the ignition switch to ON.
(2) Bring your ear near the top of the shock absorber.dNOTE
In the case of the rear shock absorbers, remove the trim
cover at the top of the shock absorber before bringing your
ear near the shock absorber.
(3) Check that the operating sound of the actuator in the shockabsorber can be heard each time the control modes are
changed by pressing the ECS switch.
6-2. Damping Force Check(1) Set the ignition switch to ON.
(ECS indicator Tour ON, damping force SOFT)
(2) Check the damping force SOFT state by shaking the top
mounting points of the front shock absorbers or the top ofthe rear end panels of the rear shock absorbers up and
down.
(3) Press the ECS switch to change the control mode to Sport.(ECS indicator Sport ON, damping force HARD)
(4) Shake the vehicle up and down to check that the dampingforce is harder than in the SOFT state.
TSB Revision

33B-20 ELECTRONIC CONTROL SUSPENSION (ECS)-llwmtk Positkm .semor I stop tight switch I POriticm DetsctionSWitEh 1 DPmping Force changeover Acluatc., / EC3 Indii.ar l.igil*
THROTTLE POSITION SENSORM33ZKA6
INSPECTION AND ADJUSTMENTIRefer to GROUP 13
- Fuel System.‘lJ ’
STOP LIGHT SWITCHM33ZCAC
To remove or mount the stop light switch, refer to GROUP 35 -
Brake Pedal.
INSPECTIONRefer to GROUP 35
- Brake Pedal.
POSITION DETECTION SWITCH and
DAMPING FORCE CHANGEOVER
ACTUATORM33ZCAD
To remove or mount the position detection switch and dampingforce changeover actuator, refer to GROUP 33A
- Strut LJAssembly and GROUP 34
- Shock Absorber Assembly.
CautionThe position detection switch and damping force
changeover actuator are built into the shock absorber
assemblies of front and rear suspensions. Since they are ofthe non-disassembly type, remove or mount them in the
form of a strut assembly or shock absorber assembly.
ECS INDICATOR LIGHTM33ZLAB
To remove or mount the ECS indicator lights, refer to GROUP54
- Meters and Gauges.
TSB Revision

33B-24 ELECTRONIC CONTROL SUSPENSION (ECS) - Circuit Diagram
FRONT SHOCK ABSORBERtLH)
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TSB Revision

id
REAR
SUSPE,NSlON
CONTENTSM34AA-.

REAR SUSPENSION ASSEMBLY. . . . . . . . . .._..24
SERVICE ADJUSTMENT PROCEDURES. .
23
Rear Wheel Alignment Inspection. . . . . . . . . .23
SHOCK ABSORBER ASSEMBLY. . . . . . . . . . . . .33
SPECIAL TOOLS .
.._____......_..................._.................20SPECIFICATIONS
.__............................................. 19
General Specifications. . . . . . . . . . . . . . . . . . . .19
/
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Service Specifications.._............................... 19
STABILIZER BAR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34TRAILING ARM
.._........_._...................................... 30
TROUBLESHOOTING
_....................................... 22
UPPER AND LOWER ARM. . . . . . . . . . . . . . . . . . . ..t..........27
REAR AXLE HUB................................................
17
REAR SUSPENSION ASSEMBLY....................7
SERVICE ADJUSTMENT PROCEDURES........5
Rear Hub Rotary-sliding Resistance
(Torque) Inspection................................................
6
Rear Wheel Alignment Inspection....................
5
Wheel Bearing End Play Inspection....................6
SHOCK ABSORBER ASSEMBLY....................13
SPECIAL TOOLS....................................................
3
SPECIFICATIONS................................................2
,General Specifications....................................2
Service Specifications....................................2
STABILIZER BAR................................................15
TRAILING ARM....................................................11ITROUBLESHOOTING
4........................................UPPER ARM, LOWER ARM AND
ASSIST LINK91........................................................
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