1998 TOYOTA LAND CRUISER clutch

- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-391
584 Author
: Date
:
2004 LAND CRUISER (RM1071U)P2757
(DI-487)
Torque Converter Clutch Pres-
sure Control Solenoid Perfor-
mance
(Shift Solenoid Valve SLU)Shift solenoid valve SLU is stuck open or closed
Valve body is blocked up or stuck
Shift solenoid valve SLU
Automatic transmission assembly
ECM


P2759
(DI-491)
Torque Converter Clutch Pres-
sure Control Solenoid Control
Circuit Electrical
(Shift Solenoid Valve SLU)Open or short in shift solenoid valve SLU circuit
Shift solenoid valve SLU
ECM



- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-373
566 Author
: Date
:
9. PROBLEM SYMPTOM CONFIRMATION
Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms. If the
problem is that the transmission does not shift up, shift down, or the shift point is too high or too low, conduct
the following road test referring to the automatic shift schedule and simulate the problem symptoms.
10. ROAD TEST
NOTICE:
Perform the test at normal operating ATF temperature 50 to 80°C (122 to 176°F).
(a) D position test (NORM and PWR pattern):
Shift into the D position and fully depress the accelerator pedal and check the following points.
(1) Check up-shift operation.
Check that 1 " 2, 2 " 3, 3 " 4 and 4 " 5th up-shifts take place, and that the shift points conform
to the automatic shift schedule (See page SS-23).
HINT:

5th Gear Up-shift Prohibition Control (1. Coolant temp. is 55°C (131°F) or less. 2. Vehicle speed is
51 km/h (32 mph) or less.)

4th Gear Up-shift Prohibition Control (1. Coolant temp. is 40°C (104°F) or less. 2. Vehicle speed is
45 km/h (28 mph) or less.)

5th Gear Lock-up Prohibition Control (1. Brake pedal is depressed. 2. Coolant temp. is 60°C (140°F)
or less.)

When the 2nd start switch is on, there is no 1"2 up-shift and 2"1 down-shift.
(2) Check for shift shock and slip.
Check for shock and slip at the 1 " 2, 2 " 3, 3 " 4 and 4 " 5th up-shifts.
(3) Check for abnormal noises and vibration.
Drive in the D position lock-up or 5th gear and check for abnormal noises and vibration.
HINT:
The check for the cause of abnormal noises and vibration must be done very thoroughly as it could also be
due to loss of balance in the differential, torque converter clutch, etc.
(4) Check kick-down operation.
While running in the D position, 2nd, 3rd, 4th and 5th gears, check that the possible kick-down
vehicle speed limits for 2 " 1, 3 " 2, 4 " 3 and 5th " 4 kick-downs conform to those indicated
on the automatic shift schedule (See page SS-23).
(5) Check abnormal shock and slip at kick-down.
(6) Check the lock-up mechanism.

Drive in D position 5th gear, at a steady speed (lock-up ON) of about 70 km/h (43 mph).

Lightly depress the accelerator pedal and check that the engine speed does not change
abruptly.
If there is a big jump in engine speed, there is no lock-up.
(b) 4 position test:
Shift into the 4 position and fully depress the accelerator pedal and check the following points.
(1) Check up-shift operation.
Check that the 1 " 2, 2 " 3 and 3 " 4 up-shift takes place and that the shift point conforms
to the automatic shift schedule (See page SS-23).
HINT:

There is no 5th up-shift in the 4 position.

4th Gear Lock-up Prohibition Control (1. Brake pedal is depressed. 2. Coolant temp. is 60°C (140°F)
or less.)

DI-376
- DIAGNOSTICSAUTOMATIC TRANSMISSION
569 Author
: Date
:
14. MECHANICAL SYSTEM TESTS
(a) Measure the stall speed.
The object of this test is to check the overall performance of the transmission and engine by measuring
the stall speeds in the D and R positions.
NOTICE:

Do the test at normal operating fluid temperature 70 to 80 °C (158 to 176 °F).

Do not continuously run this test longer than 5 seconds.

To ensure safety, conduct this test in a wide, clear level area which provides good traction.

The stall test should always be carried out in pairs. One technician should observe the condi-
tions of wheels or wheel stoppers outside the vehicle while the other is doing the test.
(1) Chock all 4 wheels.
(2) Connect an OBD II scan tool or hand-held tester to DLC3.
(3) Fully apply the parking brake.
(4) Keep your left foot pressing firmly on the brake pedal.
(5) Start the engine.
(6) Shift into the D position. Press all the way down on the accelerator pedal with your right foot.
Quickly read the stall speed at this time.
Stall speed: 2,150 ± 150 rpm
(7) Do the same test in R position.
Stall speed: 2,150 ± 150 rpm
Evaluation:
ProblemPossible cause
(a) Engine stall speed low in D and R positions

Engine output may be insufficient

Stator one-way clutch is not operating properly
HINT: If the value is less than the specified value by 600 rpm or
more, the torque converter could be faulty.
(b) Engine stall speed high in D position

Line pressure too low

Clutch No. 1 (C
1) slipping

One-way clutch No.3 (F
3) not operating properly
(c) Engine stall speed high in R position

Line pressure too low

Brake No. 4 (B
4) slipping

Clutch No. 3 (C
3) slipping

One-way clutch No.1 (F
1) not operating properly
(d) Engine stall speed high in D and R positions
Line pressure too low

Improper fluid level

- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-377
570 Author
: Date
:
(b) Measure the time lag.
When the shift lever is shifted while the engine is idling, there will be a certain time lapse or lag before
the shock can be felt. This is used for checking the condition of the clutch and brake.
NOTICE:

Do the test at normal operating fluid temperature 70 to 80 °C (158 to 176 °F).

Be sure to allow 1 minute interval between tests.

Take 3 measurements and take the average value.
(1) Fully apply the parking brake.
(2) Start the engine and check idle speed.
Idle speed (In N position and air conditioner OFF): 700 ± 50 rpm.
(3) Shift the shift lever from N to D position. Using a stop watch, measure the time from when the
lever is shifted until the shock is felt.
Time lag:
N " D Less than 1.2 seconds
(4) In the same manner, measure the time lag for N " R.
Time lag:
N " R Less than 1.5 seconds
Evaluation (If N " D time or N " R time lag is longer than the specified):
ProblemPossible cause
N " D time lag is longer

Line pressure too low

Clutch No. 1 (C
1) worn

One-way clutch No.3 (F
3) not operating properly
N " R time lag is longer

Line pressure too low

Clutch No. 3 (C
3) worn

Brake No. 4 (B
4) worn

One-way clutch No.1 (F
1) not operating properly

D12745
SST
SST
DI-378
- DIAGNOSTICSAUTOMATIC TRANSMISSION
571 Author
: Date
:
15. HYDRAULIC TEST
Measure the line pressure.
NOTICE:

Do the test at normal operation fluid temperature 70
to 80°C (158 to 176°F).

The line pressure test should always be carried out in
pairs. One technician should observe the conditions
of wheels or wheel stoppers outside the vehicle while
the other is doing the test.

Be careful to prevent SST's hose from interfering with
the exhaust pipe.

This check must be conducted after checking and ad-
justing engine.

Perform under condition that A/C is OFF.

When conducting stall test, do not continue more
than 10 seconds.
(1) Warm up the ATF.
(2) Remove the test plug on the transmission case cen-
ter right side and connect SST.
SST 09992-00095 (09992-00231, 09992-00271)
(3) Fully apply the parking brake and chock the 4
wheels.
(4) Start the engine and check idling speed.
(5) Keep your left foot pressing firmly on the brake ped-
al and shift into D position.
(6) Measure the line pressure when the engine is idling.
(7) Depress the accelerator pedal all the way down.
Quickly read the highest line pressure when engine
speed reaches stall speed.
(8) In the same manner, do the test in R position.
Specified line pressure:
ConditionD position kPa (kgf/cm2
, psi)R position kPa (kgf/cm2, psi)
Idling362 to 420 (3.7 to 4.2, 53 to 59)500 to 580 (5.1 to 5.9, 73 to 84)
Stall1,360 to 1,460 (13.8 to 14.9, 196 to 212)1,295 to 1,415 (13.2 to 14.4, 188 to 205)
Evaluation
ProblemPossible cause
If the measured value at all positions are higher
Shift solenoid valve SLT defective

Regulator valve defective
If the measured value at all positions are lower

Shift solenoid valve SLT defective

Regulator valve defective

Oil pump defective
If pressure is low in the D position only
D position circuit fluid leakage

Clutch No. 1 (C
1) defective
If pressure is low in the R position only

R position circuit fluid leakage

Clutch No. 3 (C
3) defective

Brake No. 4 (B
4) defective

DI-400
- DIAGNOSTICSAUTOMATIC TRANSMISSION
593 Author
: Date
:
2004 LAND CRUISER (RM1071U)
Chapter 3: Off-Vehicle Repair
(
: A750E, A750F AUTOMATIC TRANSMISSION Repair Manual Pub. No. RM999U)
SymptomSuspect AreaSee page
Vehicle does not move in any forward position and reverse posi-
tions1. Rear planetary gear unit
2. Torque converter clutch

AT-34
Vehicle does not move in R position
1. Brake No. 4 (B4)
2. Clutch No. 3 (C
3)
3. One-way clutch No.4 (F
1)






No up-shift (1st " 2nd)
1. Brake No. 3 (B3)
2. One-way clutch No.1 (F
1)
3. One-way clutch No. 2 (F
2)






No up-shift (2nd " 3rd)Clutch No. 3 (C3)

No up-shift (3rd " 4th)Clutch No. 2 (C2)

No up-shift (4th " 5th)1. Brake No. 1 (B1)
2. Clutch No. 1 (C
1)




No lock-up or No lock-up offTorque converter clutchAT-34
Harsh engagement (N " D)1. Clutch No. 1 (C1)
2. One-way clutch No.3 (F
3)




Harsh engagement (N " R)
1. Clutch No. 3 (C3)
2. Brake No. 4 (B
4)
3. One-way clutch No.1 (F
1)






Harsh engagement (1 " 2)
1. Brake No. 3 (B3)
2. One-way clutch No.1 (F
1)
3. One-way clutch No. 2 (F
2)






Harsh engagement (2 " 3)Clutch No. 3 (C3)

Harsh engagement (3 " 4)Clutch No. 2 (C2)

Harsh engagement (4 " 5th)1. Brake No. 1 (B1)
2. Clutch No. 1 (C
1)




Harsh engagement (Lock-up)Torque converter clutchAT-34
Slip or shudder (Forward and reverse: After warm-up)
1. One-way clutch No.1 (F1)
2. Clutch No. 3 (C
3)
3. Torque converter clutch clutch






Slip or shudder (Particular position: Just after engine starts)Torque converter clutchAT-34
Slip or shudder (R position)
1. Brake No. 4 (B4)
2. One-way clutch No.1 (F
1)
3. Clutch No. 3 (C
3)






Slip or shudder (1st)1. Clutch No. 1 (C1)
2. One-way clutch No.3 (F
3)




Slip or shudder (2nd)
1. Clutch No. 1 (C1)
2. Brake No. 3 (B
3)
3. One-way clutch No.1 (F
1)
4. One-way clutch No.2 (F
2)








Slip or shudder (3rd)
1. Clutch No. 1 (C1)
2. Clutch No. 3 (C
3)
3. One-way clutch No.1 (F
1)






Slip or shudder (4th)1. Clutch No. 1 (C1)
2. Clutch No. 2 (C
2)




Slip or shudder (5th)
1. Clutch No. 2 (C2)
2. Clutch No. 3 (C
3)
3. Brake No. 1 (B
1)






No engine braking (1st - 4th: D position)Clutch No. 1 (C1)

- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-401
594 Author
: Date
:
2004 LAND CRUISER (RM1071U) No engine braking (1st: L position)
Brake No. 4 (B4)

No engine braking (2nd: 2 position)Brake No. 2 (B2)

No engine braking (3rd: 3 position)Brake No. 1 (B1)

Poor acceleration (All positions)Torque converter clutchAT-34
Poor acceleration (5th)
1. Clutch No. 1 (C1)
2. Clutch No. 3 (C
3)
3. Brake No. 1 (B
1)
4. Front planetary gear unit








Engine stalls when starting off or stoppingTorque converter clutchAT-34

DI-16
- DIAGNOSTICSENGINE
209 Author
: Date
:
FUEL SYS #1
Fuel system status (Bank1)/
OL or CL or OLDRIVE or OL-
FAULT or CLFAULT
Idli ft i CL

OL: Open Loop-has not yet sa-
tisfied conditions to go closed
loop.

CL: Closed Loop-using oxygen
sensor(s) as feed back for fuel
control.

OL DRIVE: Open loop due to
dri ing conditions (Po er enrich
FUEL SYS #2
Fuel system status (Bank2)/
OL or CL or OLDRIVE or OL-
FAULT or CLFAULT
Idling after warming up: CLdriving conditions (Power enrich-
ment, deceleration enlargement).

OL FAULT: Open loop due to de-
tected system fault.

CL FAULT: Closed loop, but fault
with at least one oxygen sensor
may be using single oxygen sen-
sor for fuel control.
FC IDLIdle fuel cut/
ON or OFFFuel cut operation: ON
FC IDL = ºONº when throttle valve
fully closed and engine speed is
over 1,500 rpm.
MILMIL status/
ON or OFFMIL ON: ON-
STARTER SIGStarter signal/
ON or OFFCranking: ON-
A/C SIGA/C signal/
ON or OFFA/C ON: ON-
PNP SW [NSW]Park/neutral position switch signal/
ON or OFFP or N range: ON-
ELECT LOAD SIGElectrical load signal/
ON or OFFDefogger switch ON: ON-
STOP LIGHT SWStop light switch/
ON or OFF
Brake pedal depressed: ON

Brake pedal released: OFF-
FUEL PMP SP CTLFuel pump speed control status/
ON or OFFIdling: ON-
FUEL PUMP/SPDFuel pump/speed status/
ON/H or OFF/M, LIdling: ON-
A/C MAG CLUTCHA/C magnet clutch status/
ON or OFFA/C magnet clutch ON: ON-
EVAP VSVVSV status for EVAP control/
ON or OFFVSV operating: ONVSV for EVAP is controlled by the
ECM (ground side duty control)
IGNITIONIgnition counter/
Min.: 0, Max.: 4000 to 400-
VAPOR PRESSVapor pressure/
Min.: -4.125 kPa, Max.: 2.125 kPaFuel tank cap removed:
0 kPaPressure inside of fuel tank as
read by the vapor pressure sen-
sor.
CYL #1 - CYL #8Misfire ratio of the cylinder/
Min.: 0%, Max.: 50%0%This item is displayed in only idling
*1: If no conditions are specifically stated for ºldlingº, it means the shift lever is in the N or P position, the A/C
switch is OFF and all accessory switches are OFF.