power steering TOYOTA LAND CRUISER 1986 Factory Repair Manual

AT07I-05
D13117N´m (kgf´cm, ft´lbf) : Specified torqueClip
Oil Cooler PipeClip
Clip
Clip
Clip
Oil Cooler Stay
Oil Cooler
12 (122, 9)
Oil Cooler Bracket
Radiator Grille Sub-assy
7.5 (76, 66 in.´lbf)
7.5 (76, 66 in.´lbf)
Power Steering
Oil Cooler Sub-assy
Oil Cooler Bracket
5.0 (51, 44 in.´lbf)
5.0 (51, 44 in.´lbf)5.0 (51, 44 in.´lbf)
5.0 (51, 44 in.´lbf)
5.0 (51, 44 in.´lbf)
12 (122, 9)
12 (122, 9)
AT-16
- AUTOMATIC TRANSMISSIONAIR COOLED OIL COOLER
1870 Author
: Date
:
2004 LAND CRUISER (RM1071U)
AIR COOLED OIL COOLER
COMPONENTS

AT113-01
D12665
D01688
D01689
D01690
- AUTOMATIC TRANSMISSIONAIR COOLED OIL COOLER
AT-17
1871 Author
: Date
:
2004 LAND CRUISER (RM1071U)
REMOVAL
1. REMOVE RADIATOR GRILLE SUB-ASSY
(a) Remove the 3 screws.
(b) Release the 2 clips and remove the radiator grille sub-
assy.
2. SEPARATE POWER STEERING OIL COOLER SUB-
ASSY
Remove the 2 bolts and separate the power steering oil cooler
sub-assy .
Torque: 7.5 N´m (76 kgf´cm, 66 in.´lbf)
3. REMOVE OIL COOLER
(a) Loosen the 2 clips and disconnect the 2 hoses.
(b) Remove the 4 bolts and oil cooler.
Torque: 12 N´m (117 kgf´cm, 8 ft´lbf)
(c) Remove the 8 bolts, the 2 oil cooler brackets and the 2
stays.
Torque: 4.9 N´m (50 kgf´cm, 43 in.´lbf)

I24857EAU AU1AU2
- BODY ELECTRICALAUDIO SYSTEM
BE-173
2546 Author
: Date
:
2004 LAND CRUISER (RM1071U)
HINT:
Check the wire harness between radio receiver assembly and
the CD auto changer, between radio receiver assembly and
power amplifier.
5. INSPECT STEERING PAD SWITCH CIRCUIT
Disconnect the connectors from the steering pad switch, and in-
spect the connector on the wire harness side.
Tester connectionConditionSpecified condition
AU1 - EAUDo not switch positionApprox. 100 kW
AU1 - EAUSEEK+ switch: push0 W
AU1 - EAUSEEK- switch: pushApprox. 0.3 W
AU1 - EAUVOL+ switch: pushApprox. 1k W
AU1 - EAUVOL- switch: pushApprox. 3.2 kW
AU2 - EAUDo not switch positionApprox. 100 kW
AU2 - EAUMODE switch: push0 W
If the circuit is not as specified, inspect the circuits connected
to other parts.

BE0GD-23
I25523
Cowl SIde J/B RH

RADIO Fuse
TweeterRadio Assembly
Ignition Switch
Engine Room R/B

AMP Fuse
Woofer SpeakersSpeakers
Power Amplifier Steering Pad Switch
RSA
Antenna Assembly

Motor Antenna
Cowl Side J/B LH

ECU IG1 Fuse

IG Fuse
BE-170
- BODY ELECTRICALAUDIO SYSTEM
2543 Author
: Date
:
2004 LAND CRUISER (RM1071U)
LOCATION

BE-150
- BODY ELECTRICALAUDIO SYSTEM
2523 Author
: Date
:
2004 LAND CRUISER (RM1071U)
4. PROBLEM SYSMPTOMS TABLE
NOTICE:
When replacing the internal mechanism (computer part) of the audio system, be careful that no part
of your body or clothing comes in contact with the terminals of the leads from the IC, etc. of the re-
placement part (spare part).
HINT:
This inspection procedure is a simple troubleshooting which should be carried out on the vehicle during sys-
tem operation and was prepared on the assumption of system component troubles (except for the wires and
connectors, etc.).
Always inspect the trouble taking the following items into consideration.
Open or short circuit of the wire harness
Connector or terminal connection fault
ProblemFlow chart No.
RadioRadio not operating when power switch turned to 'ON'.1
Display indicates when power switch turned to 'ON', but no sound (including
'noise') is produced.2
Noise present, but AM - FM not operating.3
Any speaker does not work.4
Any AM or FM does not work.5
Few preset turning bands.5
Reception poor.6
Sound quality poor.7
Preset memory disappears.8
Tape PlayerCassette tape cannot be inserted.9
Cassette tape inserted, but no power.10
Power coming in, but tape player not operating.11
Any speaker does not work.12
Sound quality poor.13
Tape jammed, malfunction with tape speed or auto-reverse.14
Cassette tape will not eject.15
CD PlayerCD cannot be inserted.16
CD inserted but no power/17
Power coming in, but CD player not operating.18
Sound jumps.19
Sound quality poor (Volume faint)20
Any speaker does not work.21
CD will not be ejected.22
Power AmplifierNo power coming in.23
Power coming in, but power amplifier not operating.24
Any speaker does not work.25
NoiseNoise occurs26
Noise produced by vibration or shock while driving.27
Noise produced when engine starts.28
Steering Pad SwitchA audio system cannot be operated with steering pad switch.29
Rear Seat AudioQuality of sound from headphone connected to headphone terminal is poor or no
sound can be heard.30

ABS Antilock Brake System
A/C Air Conditioner
assy assembly
ECT Electronic Controlled Transmission
ECU Electronic Control Unit
e.g. Exempli Gratia (for Example)
Ex. Except
4WD Four Wheel Drive Vehicles
in. inch
LH Left-hand
LHD Left-hand Drive
MIG Metal Inert Gas
M/Y Model Year
PPS Progressive Power Steering
RH Right-hand
RHD Right-hand Drive
SRS Supplemental Restraint System
SSM Special Service Materials
w/ with
w/o without
5. ECU (ELECTRONIC CONTROL UNIT)
Many ECUs are mounted in this vehicle.
Take the following precautions during body repair to prevent damage to the ECUs.

Before starting electric welding operations, disconnect the negative (-) terminal cable from the battery.
When the negative (-) terminal cable is disconnected from the battery, memory of the clock and audio
systems will be cancelled. So before starting work, make a record of the contents memorized by each
memory system. Then when work is finished, reset the clock and audio systems as before.
When the vehicle has tilt and telescopic steering, power seat and outside rear view mirror, which are all
equipped with memory function, it is not possible to make a record of the memory contents. So when the
operation is finished, it will be necessary to explain this fact to the customer, and request the customer to
adjust the features and reset the memory.

Do not expose the ECUs to ambient temperatures above 80°C (176°F).
NOTICE: If it is possible the ambient temperature may reach 80° (176°F) or more, remove the ECUs
from the vehicle before starting work.

Be careful not to drop the ECUs and not to apply physical shocks to them.
ABBREVIATIONS USED IN THIS MANUAL
For convenience, the following abbreviations are used in this
manual.
INTRODUCTIONIN-9

HANDLING PRECAUTIONS ON RELATED COMPONENTS
1. FOR VEHICLES EQUIPPED WITH SRS AIRBAG AND SEAT BELT PRETENSIONER
The TOYOTA LAND CRUISER is equipped with an SRS (Supplemental Restraint System), such as the driver
airbag and front passenger airbag and seat belt pretensioners. Failure to carry out service operations in the
correct sequence could cause the supplemental restraint system to unexpectedly deploy during servicing, pos-
sibly leading to a serious accident. Further, if a mistake is made in servicing the supplemental restraint system,
it is possible the SRS may fail to operate when required. Before servicing (including removal or installation of
parts, inspection or replacement), be sure to read the following items carefully, then follow the correct proce-
dure described in this manual.

Malfunction symptoms of the supplemental restraint system are difficult to confirm, so the diagnostic
trouble codes become the most important source of information when troubleshooting.
When troubleshooting the supplemental restraint system, always inspect the diagnostic trouble codes
before disconnecting the battery.

Work must be started after 90 seconds from the time the ignition switch is turned to the ºLOCKº position
and the negative (-) terminal cable is disconnected from the battery.
(The supplemental restraint system is equipped with a back-up power source so that if work is started
within 90 seconds of disconnecting the negative (-) terminal cable from the battery, the SRS may
deploy.)
When the negative (-) terminal cable is disconnected from the battery, memory of the clock and audio
systems will be cancelled. So before starting work, make a record of the contents memorized by the
audio memory system.
Then when work is finished, reset the clock and audio systems as before.
To avoid erasing the memory of each memory system, never use a back-up power supply from outside
the vehicle.

Even in cases of a minor collision where the SRS does not deploy, the passenger's airbag assembly,
the steering wheel pad and seat belt pretensioners should be inspected.
Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.

Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during repairs.

Never disassemble and repair the airbag sensor assembly, steering wheel pad in order to reuse it.

If the airbag sensor assembly, steering wheel pad have been dropped, or if there are cracks, dents or
other defects in the case, bracket or connector, replace them with new ones.

Do not expose the airbag sensor assembly, steering wheel pad directly to hot air or flames.

Use a volt/ohmmeter with high impedance (10 k
/V minimum) for troubleshooting of the electrical cir-
cuit.

Information labels are attached to the periphery of the SRS components. Follow the instructions on the
notices.

After work on the supplemental restraint system is completed, check the SRS warning light.

Before repairing the body, remove the SRS parts if, during repair, shocks are likely to be applied to the
sensors due to vibrations of the body or direct tapping with tools or other parts.

Do not expose the SRS parts directly to hot air or flames.
NOTICE:
1) The maximum ambient temperature tolerance is 120
°C (248°F) for the front airbag sensor, 105°C
(221
°F) for the center airbag sensor assembly and 93°C (200°F) for the steering wheel pad, and
front passenger airbag assembly. If it is possible that the ambient temperature may reach or ex-
ceed the temperature limit, remove the sensors and the steering wheel pad from the vehicle or
protect them with a hot insulation material before staring work.
2) Prior to welding, remove adjacent SRS parts form the vehicle or protect them with fire-proof cov-
ers.

If the vehicle is damaged, visually inspect for damage to the steering wheel pad using the inspection
procedures described in section RS of the repair manual for the relevant model year.
INTRODUCTIONIN-6

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-521
714 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC chart of VSC:
DTC No.
(See Page)Detection ItemTrouble Area
C1231 / 31
(DI-546)Malfunction in steering angle sensor
Steering angle sensor

Steering angle sensor circuit
C1232 / 32
(DI-551)Malfunction in deceleration sensor
Deceleration sensor

Deceleration sensor circuit
C1233 / 33
(DI-553)Open or short in yaw rate sensor circuit
Yaw rate sensor

Yaw rate sensor circuit
C1234 / 34
(DI-553)Malfunction in yaw rate sensor
Yaw rate sensor

Yaw rate sensor circuit
C1335 / 35
(DI-546)Open circuit in steering angle sensor
Steering angle sensor

Steering angle sensor circuit
C1210 / 36
(DI-538)Zero point calibration of yaw rate sensor undone

Yaw rate sensor

Yaw rate sensor circuit

PNP switch circuit (P position)
C1336 / 39
(DI-609)Zero point calibration of deceleration sensor undone

Deceleration sensor

Deceleration sensor circuit

PNP switch (P position) circuit
C1223 / 43
(DI-540)Malfunction in ABS control systemABS control system
C1224 / 44
(DI-541)Open or short in NE signal circuit

NEO circuit

ECM

Skid control ECU
C1290 / 66
(DI-608)Zero point calibration of steering sensor undone
Steering angle sensor zero point calibration

Yaw rate sensor zero point calibration
C1340 / 47
(DI-612)Open circuit in center differential lock signal
Center differential lock system

Center differential lock circuit
C1201 / 51
(DI-535)ECM system malfunctionEngine control system
C1203 / 53
(DI-536)ECM communication circuit malfunction

TRC+ or TRC- circuit

ENG+ or ENG- circuit

ECM
Always ON
(DI-627)Malfunction in skid control ECU
Open in VSC TRAC warning light circuit
Power source circuit

VSC TRAC warning light circuit
HINT:
There is a case that TOYOTA hand-held tester cannot be used when the VSC TRAC warning light is always
on.

DI-508- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
701 Author
: Date
:
2004 LAND CRUISER (RM1071U)WHEEL SPD FL
Front Left wheel speed/
Min.: 0km/h, Max.: 326.4 km/hActual wheel speedSpeed indicated on speedometer
WHEEL SPD RRRear Right wheel speed/
Min.: 0km/h, Max.: 326.4 km/hActual wheel speedSpeed indicated on speedometer
WHEEL SPD RLRear Left wheel speed/
Min.: 0km/h, Max.: 326.4 km/hActual wheel speedSpeed indicated on speedometer
DECELERAT SENSG sensor (GL1 filter)/
Min.: -1.869 G, Max.: 1.869Approximately 0 ± 0.13 G at still
conditionReading changes when vehicle is
bounced
DECELERAT SENS2G sensor (GL2 filter)/
Min.: -1.869 G, Max.: 1.869Approximately 0 ± 0.13 G at still
conditionReading changes when vehicle is
bounced
IG VOLTAGEECU IG power voltage/
UNDER or NORMAL or OVER--
SFRRSFRR/ ON or OFF--
SFRHSFRH/ ON or OFF--
SFLRSFLR/ ON or OFF--
SFLHSFLH/ ON or OFF--
SRRR (SRR)SRRR (SRR)/ ON or OFF--
SRRH (SRH)SRRH (SRH)/ ON or OFF--
SRLRSRLR/ ON or OFF--
SRLHSRLH/ ON or OFF--
SRCF (SA1)SRCF (SA1)/ ON or OFF--
SRCR (SA2)SRCR (SA2)/ ON or OFF--
SRMF (SMCF, SA3)SRMF (SMCF, SA3)/ ON or OFF--
SRMR (SMCR, STR)SRMR (SMCR, STR)/ ON or OFF--
THROTTLEThrottle position sensor/
Min.: 0 deg, Max.: 125 deg--
ENGINE SPDEngine Speed/
Min.: 0 rpm, Max.: 6000 rpmActual engine speed-
YAW R AT EYaw rate sensor/
Min.: -128 deg/s, Max.: 128 deg/s--
YAW ZERO VALUEMemorized zero value/
Min.: -128 deg/s, Max.: 128 deg/s--
STEERING ANG
Steering sensor/
Min.: -1682 deg,
Max.: 1877 deg
-1682 to 1877 deg
Turning the steering wheel
changes the value
Left : Becomes grater
Right : Becomes smaller
MAS CYL PRS 1Master cylinder pressure 1/
Min.: 0 V, Max.: 5 VWhen brake pedal is released:
0.3 - 0.9 VReading increases when brake
pedal is depressed
AIR BLD SUPPORTAir bleed support/
NOT SUP or SUPPORTw/ BA: Supported
w/ VSC: Not supported-
TEST MODETest mode operation/
NORMAL or TESTNORMAL: Normal mode
TEST: During test mode-
#CODESNumber of Trouble Code/
Min.: 0, Max.: 255MIn.: 0, Max.: 45-

DIC91-01
DI-526- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
719 Author
: Date
:
2004 LAND CRUISER (RM1071U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
NOTICE:
When replacing the skid control ECU, sensor, etc., turn the ignition switch OFF.
SymptomSuspected AreaSee page
ABS does not operate
BA does not operate
Only when 1. to 4. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Reconfirm the DTC and check that the normal code is
output.
2. IG power source circuit
3. Speed sensor circuit
4. Check the hydraulic brake booster with a checker or
hand-held tester.
If abnormal, check the hydraulic circuit for leakage (See
page DI-655).
DI-505
DI-558
DI-615
BR-40
ABS does not operate efficiently
BA does not operate
Only when 1. to 4. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Reconfirm the DTC and check that the normal code is
output.
2. Speed sensor circuit
3. Stop light switch circuit
4. Check the hydraulic brake booster with a checker or
hand-held tester.
If abnormal, check the hydraulic circuit for leakage (See
page DI-655).
DI-505
DI-615
DI-573
BR-40
ABS warning light abnormal1. ABS warning light circuit
2. Skid control ECUDI-627
IN-36
DTC check cannot be done
Only when 1. to 4. are all normal and the problem is still
occurring, replace the skid control ECU.
1. ABS warning light circuit
2. VSC OFF indicator light, center diff. lock indicator switch
circuit
3. Center diff. lock indicator switch circuit
4. Tc terminal circuit
DI-627
DI-645
DI-612
DI-651
Speed sensor signal check cannot be done1. Ts terminal circuit
2. Skid control ECUDI-653
IN-36
TRAC does not operate
Only when 1. to 4. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. IG power source circuit
3. Check the hydraulic circuit for leakage.
4. Speed sensor circuit
DI-505
DI-558
DI-655
DI-615
VSC does not operate
Only when 1. to 7. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. IG power source circuit
3. Check the hydraulic circuit for leakage.
4. Speed sensor circuit
5. Deceleration sensor circuit
6. Yaw rate sensor circuit
7. Steering angle sensor circuit
DI-505
DI-558
DI-655
DI-615
DI-570
DI-553
DI-605