2001 TOYOTA SEQUOIA clutch

DIDIQ±01
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±535
729 Author: Date:
2005 SEQUOIA (RM1146U)
ROAD TEST
1. PROBLEM SYMPTOM CONFIRMATION
Based on the result of the customer problem analysis, try to reproduce the symptoms. If the problem is that
the transaxle 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.
2. ROAD TEST
NOTICE:
Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C
(122 to 176°F).
(a) D position test:
Shift into the D position and fully depress the accelerator pedal and check the following points. Check
up±shift operation.
(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±24).
HINT:
5th Gear Up±shift Prohibition Control

Engine coolant temperature is 55 °C (131 °F) or less and vehicle speed is at 51 km/h (32 mph) or less.
4th Gear Up±shift Prohibition Control

Engine coolant temperature is 40 °C (104 °F) or less and vehicle speed is at 45 km/h (28 mph) or less.
5th Gear Lock±up Prohibition Control

Brake pedal is depressed.

Accelerator pedal is released.

Engine coolant temperature is 60 °C (140 °F) or less.
(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 noise and vibration.
Check for abnormal noise and vibration when up±shifting from 1 " 2, 2 " 3, 3 " 4 and 4 " 5
while driving with the shift lever in the D position, and check while driving in the lock±up condition.
HINT:
The check for the cause of abnormal noise and vibration must be done thoroughly as it could also be due
to loss of balance in the differential, torque converter clutch, etc.
(4) Check kick±down operation.
Check vehicle speeds when the 2nd to 1st, 3rd to 2nd, 4th to 3rd, and 5th to 4th kick±downs take
place while driving with the shift lever in the D position. Confirm that each speed is within the
applicable vehicle speed range indicated in the automatic shift schedule (See page SS±24).
(5) Check abnormal shock and slip at kick±down.
(6) Check the lock±up mechanism.

Drive in the D position (5th gear), at a steady speed (lock±up ON).

Lightly depress the accelerator pedal and check that the engine speed does not change
abruptly.
HINT:
If there is a big jump in engine speed, there is no lock±up.

DIDIR±01
DI±538
± DIAGNOSTICSAUTOMATIC TRANSMISSION
732 Author: Date:
2005 SEQUOIA (RM1146U)
MECHANICAL SYSTEM TESTS
1. PERFORM 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 positions.
NOTICE:

Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature 50
to 80°C (122 to 176°F).

Do not continuously run this test for longer than 5 seconds.

To ensure safety, do 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 a hand±held tester to DLC3.
(3) Fully apply the parking brake.
(4) Using your left foot, keep the brake pedal firmly depressed.
(5) Start the engine.
(6) Shift into the D position. Press all the way down on the accelerator pedal with your right foot.
(7) Quickly read the stall speed at this time.
Stall speed: 2,200 ± 150 rpm
Evaluation:
ProblemPossible cause
(a) Stall engine speed is low in D position

Engine power 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) Stall engine speed is high in D position

Line pressure is too low

Clutch No.1 (C
1) slipping

One±way clutch No.3 (F
3) is not operating properly

Improper fluid level

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±539
733 Author: Date:
2005 SEQUOIA (RM1146U)
(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 direct clutch, forward clutch, and
1st and reverse brake.
NOTICE:

Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50
to 80°C (122 to 176°F).

Be sure to allow for a 1 minute interval between tests.

Perform the test three times, and measure the time lags. Calculate the average value of the three
time lags.
(1) Connect a hand±held tester to DLC3.
(2) Fully apply the parking brake.
(3) Start and warm up the engine and check idle speed.
Idle speed: approx. 700 rpm (In N position and A/C OFF)
(4) Shift the lever from the 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
(5) 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 than specified

Line pressure is too low

Clutch No.1 (C
1) worn

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

Line pressure is too low

Clutch No.3 (C
3) worn

Brake No.4 (B
4) worn

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

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±541
735 Author: Date:
2005 SEQUOIA (RM1146U)
Specified line pressure:
ConditionD position kPa (kgf / cm2, psi)R position kPa (kgf / cm2, psi)
Idling361 to 421 kPa
(3.7 to 4.3 kgf/cm2, 52 to 61 psi)
495 to 576 kPa
(5.0 to 5.9 kgf/cm2, 72 to 84 psi)
Stall test1,236 to 1,332 kPa
(12.6 to 13.6 kgf/cm2, 179 to 193 psi)
1,229 to 1,349 kPa
(12.5 to 13.8 kgf/cm2, 178 to 196 psi)
Evaluation
ProblemPossible cause
Measured values are higher than specified in all positions
Shift solenoid valve (SLT) defective

Regulator valve defective
Measured values are lower than specified in all positions

Shift solenoid valve (SLT) defective

Regulator valve defective

Oil pump defective
Pressure is low in the D position only
D position circuit fluid leak

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

R position circuit fluid leak

Clutch No.3 (C
3) defective

Brake No.4 (B
4) defective

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±557
751 Author: Date:
2005 SEQUOIA (RM1146U)
Chapter 3: Off±Vehicle Repair
(
: A750E, A750F AUTOMATIC TRANSMISSION Repair Manual Pub. No. RM999U)
SymptomSuspect AreaSee page
Vehicle does not move with shift lever in any forward position and
reverse position1. Rear planetary gear unit
2. Torque converter clutch

AT±30
Vehicle does not move with shift lever 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±30
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±30
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±30
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)

DI±558
± DIAGNOSTICSAUTOMATIC TRANSMISSION
752 Author: Date:
2005 SEQUOIA (RM1146U) 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±30
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±30

DIDJ2±01
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±567
761 Author: Date:
2005 SEQUOIA (RM1146U)
FAIL±SAFE CHART
1. FAIL±SAFE
This function minimizes the loss of the ECT functions when any malfunction occurs in a sensor or solenoid.
Malfunction PartFunction
Output Speed Sensor (SP2)During an output speed sensor malfunction, shift control is effected through the
input speed sensor signal (NT).
ATF Temp. Sensor No. 1During an ATF temperature sensor No. 1 malfunction, up±shift to the 5th and flex
lock±up clutch control are prohibited.
Shift Solenoid Valve S1, S2 and SR
The current to the failed solenoid valve is cut off and control is effected by operating
the other solenoid valves with normal operation.
Shift control is effected depending on the failed solenoid as described in the table
on the next page.
Shift Solenoid Valve SL1 and SL2During a solenoid valve SL1 or SL2 malfunction, up±shift to the 5th is prohibited.
Shift Solenoid Valve SLU
During a solenoid valve SLU malfunction, the current to the solenoid valve is
stopped. This stops lock±up control and flex lock±up control, fuel economy de-
creases.
Shift Solenoid Valve SLT
During a solenoid valve SLT malfunction, the current to the solenoid valve is
stopped. This stops line pressure optimal control, the shift shock increases. How-
ever, shifting is effected through normal clutch pressure control.
Fail Safe Function:
If either of the shift solenoid valve circuits has an open or short failure, the ECM turns the other shift solenoid
ºONº and ºOFFº in order to shift into the gear positions shown in the table below.
In case of a short circuit, the ECM stops sending current to the short circuited solenoid.
Even if starting the engine again in the fail±safe mode, the gear position remains in the same position.

DIDJ4±01
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±573
767 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
If a DTC is displayed during the DTC check, check the parts listed in the table below and proceed to the page
given.
HINT:
*1 :
... The MIL (Malfunction Indicator Lamp) lights up
*2 :  ... The ECM memorizes the trouble code if the ECM detects the DTC detection condition.
This DTC may be output when the clutch, brake and gear components etc. inside the automatic trans-
mission are damaged.
DTC No.
(See Page)Detection ItemTrouble AreaMIL *1Memory *2
P0500
(DI±278)Vehicle Speed Sensor ºAº
Open or short in speed sensor (SP2) circuit
Speed sensor (SP2)
ECM


P0705
(DI±576)Transmission Range Sensor Cir-
cuit Malfunction (PRNDL Input)Open or short in park/neutral position switch circuit
Park/neutral position switch
ECM


P0710
(DI±582)Transmission Fluid Temperature
Sensor ºAº CircuitOpen or short in ATF temperature sensor No.1 circuit
Transmission wire (ATF temperature sensor No.1)
ECM


P0711
(DI±588)Transmission Fluid Temperature
Sensor ºAº PerformanceTransmission wire (ATF temperature sensor No.1)

P0712
(DI±582)Transmission Fluid Temperature
Sensor ºAº Circuit Low InputShort in ATF temperature sensor No.1 circuit
Transmission wire (ATF temperature sensor No.1)
ECM


P0713
(DI±582)Transmission Fluid Temperature
Sensor ºAº Circuit High InputOpen in ATF temperature sensor No.1 circuit
Transmission wire (ATF temperature sensor No.1)
ECM


P0717
(DI±591)Input Speed Sensor Circuit No
Signal
Open or short in speed sensor (NT) circuit
Speed sensor (NT)
ECM
Automatic transmission (clutch, brake or gear, etc.)


P0722
(DI±596)Output Speed Sensor Circuit No
Signal
Open or short in speed sensor (SP2) circuit
Speed sensor (SP2)
ECM
Automatic transmission (clutch, brake or gear, etc.)


P0724
(DI±600)Brake Switch ºBº Circuit High
Short in stop light switch signal circuit
Stop light switch
ECM


P0748
(DI±603)Pressure Control Solenoid ºAº
Electrical
(Shift Solenoid Valve SL1)Open or short in shift solenoid valve SL1 circuit
Shift solenoid valve SL1
ECM


P0751
(DI±608)Shift Solenoid ºAº Performance
(Shift Solenoid Valve S1)Shift solenoid valve S1 remains open or closed
Valve body is blocked
Automatic transmission (clutch, brake or gear, etc.)


P0756
(DI±614)Shift Solenoid ºBº Performance
(Shift Solenoid Valve S2)Shift solenoid valve S2 remains open or closed
Valve body is blocked
Automatic transmission (clutch, brake or gear, etc.)


P0771
(DI±620)Shift Solenoid ºEº Performance
(Shift Solenoid Valve SR)
Shift solenoid valve SR remains open or closed
Shift solenoid valve SL1 remains open or closed
Valve body is blocked
Automatic transmission (clutch, brake or gear, etc.)