1986 TOYOTA LAND CRUISER air suspension

Component to be alignedSection of repair manual for
relevant model
Front WheelsSuspension and Axle (SA) section
Rear WheelsSuspension and Axle (SA) section
Plopeller ShaftPropeller Shaft (PR) section
AIRBAG SENSOR ASSEMBLY

Never reuse the airbag sensor assembly involved in a collision when the SRS has deployed.

The connectors to the airbag sensor assembly should be connected or disconnected with the sensor
mounted on the floor. If the connectors are connected or disconnected while the airbag sensor as-
sembly is not mounted to the floor, it could cause undesired ignition of the supplemental restraint sys-
tem.

Work must be started after 90 seconds from the time the ignition switch is turned to the ºLOCKº posi-
tion and the negative (-) terminal cable is disconnected from the battery, even if only loosening the
set bolts of the airbag sensor assembly.
WIRE HARNESS AND CONNECTOR

The SRS wire harness is integrated with the cowl wire harness assembly and floor wire harness as-
sembly. The wires for the SRS wire harness are encased in a yellow corrugated tube. All the connec-
tors for the system are also a standard yellow color. If the SRS wire harness becomes disconnected
or the connector becomes broken due to an accident, etc., repair or replace it as shown on page.
2. BRAKE SYSTEM
The brake system is one of the most important safety components. Always follow the directions and
notes given in section BR of the repair manual for the relevant model year when handling brake sys-
tem parts.
NOTICE: When repairing the brake master cylinder or TRAC system, bleed the air out of the TRAC
system.
3. DRIVE TRAIN AND CHASSIS
The drive train and chassis are components that can have great effects on the running performance
and vibration resistance of the vehicle. After installing components in the sections listed in the table
below, perform alignments to ensure correct mounting angles and dimensions. Particularly accurate
repair of the body must also be done to ensure correct alignment.
HINT: Correct procedures and special tools are required for alignment. Always follow the directions
given in the repair manual for the relevant model during alignment and section Dl of this manual.
4. COMPONENTS ADJACENT TO THE BODY PANELS
Various types of component parts are mounted directly on or adjacently to the body panels. Strictly ob-
serve the following precautions to prevent damaging these components and the body panels during
handling.

Before repairing the body panels, remove their components or apply protective covers over the com-
ponents.

Before prying components off using a screwdriver or a scraper, etc., attach protective tape to the tool
tip or blade to prevent damaging the components and the body paint.

Before removing components from the outer surface of the body, attach protective tape to the body
to ensure no damage to painted areas.
HINT: Apply touch-up paint to any damaged paint surfaces.

Before drilling or cutting sections, make sure that there are no wires, etc. on the reverse side.
INTRODUCTIONIN-8

MA02U-07
B04566
Dust Cover
B04567
B06414
MA-8
- MAINTENANCECHASSIS
56 Author
: Date
:
CHASSIS
INSPECTION
1. INSPECT STEERING LINKAGE
(a) Check the steering linkage for looseness or damage.
(b) Check the tie rod ends do not have excessive play.
(c) Check the dust seals and boots are not damaged.
(d) Check the boot clamps are not loose.
(e) Check the inspect the dust cover for damage.
2. INSPECT SRS AIRBAG (See pages RS-18, RS-32)
3. INSPECT STEERING GEAR HOUSING OIL
Check the steering gear housing for oil leakage.
If leakage is found, check for cause and repair.
4. INSPECT BALL JOINTS AND DUST COVERS
(a) Jack up the front of the vehicle and support it with stands.
(b) Make sure the front wheels are in a straight-ahead posi-
tion, and depress the brake pedal.
(c) Jack up the lower suspension arm until there is about half
a load on the front suspension.
(d) Inspect the dust cover for damage.
5. INSPECT DRIVE SHAFT BOOTS
Inspect the drive shaft boots for clamp looseness, grease leak-
age or damage.
6. INSPECT AUTOMATIC TRANSMISSION OIL LEVEL
(See page AT-3-1)
7. INSPECT TRANSFER AND DIFFERENTIAL OIL LEVEL
(a) Transfer:
Remove the filler plug and feel inside the hole with your
finger. Check that the oil comes to within 5 mm (0.20 in.)
of the bottom edge of the hole. If the level is low, add oil
until it begins to run out of the filler hole.
Transfer oil: See page TR-6

SR0LV-03
SR-2
- STEERINGTROUBLESHOOTING
2211 Author
: Date
:
2004 LAND CRUISER (RM1071U)
TROUBLESHOOTING
PROBLEM SYMPTOMS TABLE
Use the table below to help you find the cause of the problem. The numbers indicate the priority of the likely
cause of the problem. Check each part in the order shown. If necessary, repair or replace these parts.
SymptomSuspect AreaSee page
Hard steering
3. Tires (Improperly inflated)
4. Power steering fluid level (Low)
5. Drive belt (Loose)
6. Front wheel alignment (Incorrect)
7. Steering system joints (Worn)
8. Suspension arm ball joints (Worn)
9. Steering column (Binding)
10.Power steering gearSA-4
SR-5
-
SA-6
-
SA-71
SA-76
-
SR-48
Poor return
1. Tires (Improperly inflated)
2. Front wheel alignment (Incorrect)
3. Steering column (Binding)
4. Power steering gearSA-4
SA-6
-
SR-48
Excessive play
1. Steering system joints (Worn)
2. Suspension arm ball joints (Worn)
3. Intermediate shaft, Universal joint, Sliding yoke (Worn)
4. Front wheel bearing (Worn)
5. Power steering gear-
SA-71
SA-76
-
SA-1 1
SR-48
Abnormal noise
1. Power steering fluid level (Low)
2. Steering system joints (Worn)
3. Power steering gearSR-5
-
SR-48
HINT:
When the problem occurs on the power tilt and telescopic steering system, refer to the DI section
(See page DI-656).

Z16462
RLP RM1 M2
4WD GND SPD IG Wire harness:
Z16461
GND
4WDRLP M1M2 ECU: SA-164
- SUSPENSION AND AXLEDIFFERENTIAL LOCKING SYSTEM
2114 Author
: Date
:
2004 LAND CRUISER (RM1071U)
(b) Inspect the system circuit with the connector discon-
nected.
Disconnect the connector from the rear diff. lock control
ECU and inspect the connector on the wire harness side,
as shown in the table.
Symbols (Terminals No.)Trouble partConditionSpecified value
M1 - M2RR Diff. Lock Actuator-Less than 100 W
GND - Body groundBody ground-Continuity
SPD - Body groundSpeed sensorVehicle moves slowly1 pulse each
40 cm (15.75 in.)
IG - Body groundDIFF FuseIgnition switch ON10 - 14 V
RLP B d dRear Diff. Lock Indica-Ignition switch ON with indicator light ONAbout 0 VRLP - Body groundRear Diff. Lock Indica
tor SwitchIgnition switch ON with indicator light OFF10 - 14 V
4WD B d dL iti S it hIgnition switch ON with T/F shift lever except LAbout 0 V4WD - Body groundL position SwitchIgnition switch ON with T/F shift lever L10 - 14 V
RBd dDifferential Lock Con-Ignition switch ON with differential lock control switch RR10 - 14 VR - Body groundDifferential Lock Con
trol SwitchIgnition switch ON with differential lock control switch OFFAbout 0 V
HINT:
If the circuit is not as specified value, check and repair or re-
place the trouble part shown in the table above.
(c) Inspect the system circuit with the connector connected.
(1) Turn the ignition switch to the ON position.
(2) Shift the transfer shift lever to L position.
(3) Using a voltmeter, measure the voltage when the
differential lock control switch is in the position, as
shown in the table.
Tester Connection

- Switch positionSpecified valve
4WD - GND-10 - 14 V
RLP - GNDRR*0.5 V or less
M1 - M2OFF " RR0.5 V or less " 10 - 14 V
(A 1 )05VM2 - M1RR " OFF(Approx. 1 sec.) "0.5 V
or less
*: The rear differential should be locked mechanically.
If the circuit is not as specified value, replace the ECU.
(4) Install the ECU in place.

SA15O-09
W00493
30 mm
(1.18 in.)
F05201
F05202
SA2446
SA-102
- SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
2052 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DISASSEMBLY
1. SET DIFFERENTIAL CARRIER TO OVERHAUL
STAND, ETC.
2. CHECK RUNOUT OF COMPANION FLANGE
Using a dial indicator, measure the vertical and lateral runout of
the companion flange.
Maximum runout: 0.10 mm (0.0039 in.)
If the runout is greater then the maximum, replace the compan-
ion flange.
3. CHECK RING GEAR RUNOUT
Using a dial indicator, while holding the drive pinion flange,
measure the ring gear runout.
Maximum runout: 0.05 mm (0.0020 in.)
If the runout is greater than the maximum, replace the ring gear.
4. CHECK RING GEAR BACKLASH
Using a dial indicator, measure the ring gear backlash.
Backlash: 0.13 - 0.18 mm (0.0051 - 0.0071 in.)
HINT:
Perform the measurements at 3 or more positions around the
circumference of the ring gear.
If the backlash is not within the specified value, adjust the side
bearing preload or repair as necessary.
5. MEASURE DRIVE PINION PRELOAD
Using a torque wrench, measure the drive pinion preload using
the backlash of the drive pinion and ring gear.
Preload (at starting):
0.64 - 0.92 N´m (6.5 - 9.4 kgf´cm, 5.7 - 8.1 in.´lbf)

SA15U-1 1
W00493
30 mm
(1.18 in.)
F05182
F05183
SA2446
- SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER (w/ Diff. Lock)
SA-121
2071 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DISASSEMBLY
1. SET DIFFERENTIAL CARRIER TO OVERHAUL STAND
ETC.
2. CHECK RUNOUT OF COMPANION FLANGE
Using a dial indicator, measure the vertical and lateral runout of
the companion flange.
Maximum runout: 0.10 mm (0.0039 in.)
If the runout is greater than the maximum, replace the compan-
ion flange.
3. CHECK RING GEAR RUNOUT
Using a dial indicator, measure the ring gear runout.
Maximum runout: 0.05 mm (0.0020 in.)
If the runout is greater than the maximum, replace the ring gear.
4. CHECK RING GEAR BACKLASH
Using a dial indicator, while holding the drive pinion flange,
measure the ring gear backlash.
Backlash: 0.13 - 0.18 mm (0.0051 - 0.0071 in.)
HINT:
Perform the measurements at 3 or more positions around the
circumference of the ring gear.
If the backlash is not within the specified value, adjust the side
bearing preload or repair as necessary.
5. MEASURE DRIVE PINION PRELOAD
Using a torque wrench, measure the drive pinion preload using
the backlash of the drive pinion and ring gear.
Preload (at starting):
0.64 - 0.92 N´m (6.5 - 9.4 kgf´cm, 5.7 - 8.1 in.´lbf)

SA160-09
W00493
30 mm
(1.18 in.)
F05201
SA3242
- SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER (w/ LSD)
SA-143
2093 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DISASSEMBLY
1. SET DIFFERENTIAL CARRIER TO OVERHAUL
STAND, ETC.
2. CHECK RUNOUT OF COMPANION FLANGE
Using a dial indicator, measure the vertical and lateral runout of
the companion flange.
Maximum runout: 0.10 mm (0.0039 in.)
If the runout is greater then the maximum, replace the compan-
ion flange.
3. CHECK RING GEAR RUNOUT
Using a dial indicator, measure the ring gear runout.
Maximum runout: 0.05 mm (0.0020 in.)
If the runout is greater than the maximum, replace the ring gear.
4. CHECK RING GEAR BACKLASH
Using a dial indicator, while holding the drive pinion flange,
measure the ring gear backlash.
Backlash: 0.13 - 0.18 mm (0.0051 - 0.0071 in.)
HINT:
Perform the measurements at 3 or more positions around the
circumference of the ring gear.
If the backlash is not within the specified value, adjust the side
bearing preload or repair as necessary.

SA28F-03
START
Preliminary Check
Tire pressure
Vehicle height
Brake dragging ROAD TEST
Does the vehicle lead/pull?
Cross switch front tire & wheel
assemblies (left & right).
Does the vehicle lead/pull in
same direction as before?
Check front wheel alignment.
Is it within specification?
Adjust front wheel alignment.Reverse the front left side
tire and rebalance it.
Does the vehicle
lead/pull to the left?
COMPLETE
Are the tires uni-directional type?
Choose the position of front tire & wheel
assemblies where there is least amount of pull.
Increase left front camber and decrease
right front camber until lead/pull is eliminated.Increase right front camber and decrease
left front camber until lead/pull is eliminated.
NO
YES
YES
NO
YES
YES
NO
YES
NO COMPLETE
NONOYES NOIs there steering
off center?
Adjust front tie rods.
NO
YES
Is the lead/pull stronger
than before?
YES
NOTICE : Do not exceed 1° of cross camber.
Do not exceed adjustment range.
Select a flat road where the vehicle can be driven in a straight line for 100 meters at a constant speed
of 35mph. Please confirm safety and set the steering wheel to its straight position. Drive the vehicle in
a straight line for 100 meters at a constant speed of 35mph without holding the steering wheel.
(1) The vehicle can keep straight but the steering wheel has some angle.
STEERING OFF CENTER (See page SR-10)
(2) The vehicle cannot keep straight.
STEERING PULL
YES NO
YES ROAD TEST
Does the vehicle still lead/pull?
NO ROAD TEST
Does the vehicle still lead/pull? ROAD TEST
Does the vehicle still lead/pull?
ROAD TEST
Does the vehicle still lead/pull?NO
Contact your local retail tire distributor.YES
*
*
- SUSPENSION AND AXLETROUBLESHOOTING
SA-3
1953 Author
: Date
:
2004 LAND CRUISER (RM1071U)
REPAIR PROCEDURES
HINT:
This is a flow chart for vehicle pull.