2001 TOYOTA SEQUOIA engine

DIDIU±01
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±543
737 Author: Date:
2005 SEQUOIA (RM1146U)
INITIALIZATION
1. RESET MEMORY
NOTICE:

Perform the RESET MEMORY (AT initialization) when replacing the automatic transmission
assy or ECM.

The RESET MEMORY can be performed only with the Hand±held tester.
HINT:
The ECM memorizes the condition that the ECT controls the automatic transmission assy and engine assy
according to those characteristics. Therefore, when the automatic transmission assy, engine assy, or ECM
has been replaced, it is necessary to reset the memory so that the ECM can memorize the new information.
Reset procedure is as follows.
(a) Turn the ignition switch off.
(b) Connect the hand±held tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Turn the hand±held tester main switch on.
(e) Select the item ºDIAGNOSIS/ENHANCED OBD IIº.
(f) Perform the reset memory procedure from the ENGINE menu.

DIDIW±01
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±551
745 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR DRIVE PATTERN
1. MONITOR DRIVE PATTERN FOR ECT TEST
(a) Perform this drive pattern as one method to simulate the detection conditions of the ECT malfunctions.
(The DTCs may not be detected due to the actual driving conditions. And some codes may not be de-
tected through this drive pattern.)
HINT:
Preparation for driving

Warm up the engine sufficiently. (Engine coolant temperature is 60 °C (140 °F) or higher).

Drive the vehicle when the atmospheric temperature is ±10 °C (14 °F) or higher. (Malfunction is not
detected when the atmospheric temperature is ±10 °C (14 °F) or less).
Notice in driving

Drive the vehicle through all gears.
Stop " 1st " 2nd " 3rd " 4th " 5th " 5th (lock±up ON).

Repeat the above driving pattern three times or more.
NOTICE:

The monitor status can be checked using the OBD II scan tool. When using the hand±held tes-
ter, monitor status can be found in the ºENHANCED OBD II / DATA LISTº or under ºCARB OBD
IIº.

In the event that the drive pattern must be interrupted (possibly due to traffic conditions or other
factors), the drive pattern can be resumed and, in most cases, the monitor can be completed.

Perform this drive pattern on a level road as much as possible and strictly observe the posted
speed limits and traffic laws while driving.

DIDIX±01
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±553
747 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
HINT:
If a normal code is displayed during the diagnostic trouble code check although the trouble still occurs, check
the electrical circuits for each symptom in the order given in the charts on the following pages and proceed
to the page given for troubleshooting.
The Matrix Chart is divided into 3 chapters.
1. Chapter 1: Electronic Circuit Matrix Chart
Refer to the table below when the trouble cause is considered to be electrical.
If the instruction ºProceed to next circuit inspection shown on matrix chartº is given in the flow chart
of each circuit, proceed to the circuit with the next highest number in the table to continue the check.
If the trouble still occurs even though there are no abnormalities in any of the other circuits, check and
replace the ECM.
HINT:
*1: When the circuit on which mark *1 is attached is defective, DTC could be output (see page DI±573).
SymptomSuspect AreaSee page
No up±shift
(A particular gear, from 1st to 4th gear, is not up±shifted)1. Shift solenoid valve (S1) circuit *1
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI±641
DI±646
IN±35
No up±shift (4th " 5th)
1. O/D main switch circuit
2. Engine coolant temp. sensor circuit *1
3. Speed sensor NT circuit *1
4. Shift solenoid valve (SL1) circuit *1
5. Shift solenoid valve (SL2) circuit *1
6. Shift solenoid valve (SR) circuit *1
7. ECM
DI±688
DI±58
DI±591
DI±603
DI±631
DI±651
IN±35
No up±shift (3rd " 4th)
1. Engine coolant temp. sensor circuit *1
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI±58
DI±646
IN±35
No up±shift (1st " 2nd)
1. Shift position L switch circuit
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI±691
DI±646
IN±35
No down±shift (5th " 4th)
1. O/D main switch circuit
2. Shift solenoid valve (SL1) circuit *1
3. Shift solenoid valve (SL2) circuit *1
4. Shift solenoid valve (SR) circuit *1
5. ECM
DI±688
DI±603
DI±631
DI±651
IN±35
No down±shift (2nd " 1st)
1. Shift position L switch circuit
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI±691
DI±646
IN±35
No down±shift
(A particular gear, from 1st to 4th gear, is not down±shifted)1. Shift solenoid valve (S1) circuit *1
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI±641
DI±646
IN±35
No lock±up
1. ATF temperature sensor circuit *1
2. Stop light switch circuit *1
3. Speed sensor NT circuit *1
4. Shift solenoid valve (SLU) circuit *1
5. Engine coolant temp. sensor circuit *1
6. ECM
DI±582
DI±600
DI±591
DI±680
DI±58
IN±35
No lock±up off4. Shift solenoid valve (SLU) circuit *1
6. ECM
DI±680
IN±35

DI±554
± DIAGNOSTICSAUTOMATIC TRANSMISSION
748 Author: Date:
2005 SEQUOIA (RM1146U) Shift point too high or too low
1. Shift solenoid valve (SLT) circuit *1
2. Speed sensor NT circuit *1
3. Speed sensor SP2 circuit *1
4. Throttle position sensor circuit *1
5. ATF temperature sensor circuit *1
6. ECM
DI±662
DI±591
DI±596
DI±58
DI±582
IN±35
Up±shift to 5th from 4th while shift lever is in 4 position1. O/D main switch circuit
2. ECMDI±688
IN±35
Up±shift to 5th from 4th while engine is cold1. Engine coolant temp. sensor circuit *1
2. ECM
DI±58
IN±35
Up±shift to 4th from 3rd while shift lever is in 3 position1. Park/neutral position switch circuit *1
2. ECM
DI±576
IN±35
Up±shift to 3rd from 2nd while shift lever is in 2 position1. Park/neutral position switch circuit *1
2. ECM
DI±576
IN±35
Up±shift to 2nd from 1st while shift lever is in L position1. Shift position L switch circuit
2. ECMDI±691
IN±35
Harsh engagement (N " D)
1. Speed sensor NT circuit *1
2. Shift solenoid valve (SL1) circuit *1
3. Shift solenoid valve (SLT) circuit *1
4. ECM
DI±591
DI±603
DI±662
IN±35
Harsh engagement (Lock±up)
1. Speed sensor NT circuit *1
2. Speed sensor SP2 circuit *1
3. Shift solenoid valve (SLU) circuit *1
4. ECM
DI±591
DI±596
DI±680
IN±35
Harsh engagement (Any driving position)ECMIN±35
Poor acceleration
1. ATF temperature sensor No.2 circuit *1
2. Engine coolant temp. sensor circuit *1
3. Shift solenoid valve (SLT) circuit *1
4. ECM
DI±666
DI±58
DI±662
IN±35
No engine brakingECMIN±35
No kick±downECMIN±35
Engine stalls when starting off or stopping1. Shift solenoid valve (SLU) circuit *1
2. ECM
DI±680
IN±35
AT Oil Temp. warning light remains on1. ATF temperature sensor No.2 circuit*1DI±666
Lock±up at 3rd gear
1. AT F temperature sensor No.2 circuit 1
2. Engine coolant temp. sensor circuit *1DI±666
DI±58
Shift point too high
2. Engine coolant tem . sensor circuit
3. ECMDI 58
IN±35
Malfunction in shifting1. Park/neutral position switch circuit *1
2. ECM
DI±576
IN±35

DI±556
± DIAGNOSTICSAUTOMATIC TRANSMISSION
750 Author: Date:
2005 SEQUOIA (RM1146U) Harsh engagement (4th " 5th)
1. Shift solenoid valve (SL1)
2. Shift solenoid valve (SL2)
3. Valve body assy
4. Off±vehicle repair matrix chartDI±620
DI±625
AT±10
±
Harsh engagement (5th " 4th)
1. Shift solenoid valve (SL1)
2. Shift solenoid valve (SL2)
3. Valve body assy
4. Off±vehicle repair matrix chartDI±620
DI±625
AT±10
±
Slip or shudder (Forward and reverse)
1. Transmission control cable
2. Valve body assy
3. Oil strainer
4. Off±vehicle repair matrix chartDI±524
AT±10
AT±10
±
No engine braking (1st: L position)1. Valve body assy
2. Off±vehicle repair matrix chartAT±10
±
No engine braking (2nd: 2 position)1. Valve body assy
2. Off±vehicle repair matrix chartAT±10
±
No kick±downValve body assyAT±10
Shift point too high or too low
1. Shift solenoid valve (SLT)
2. Shift solenoid valve (SL1)
3. Valve body assyDI±656
DI±620
AT±10
Poor acceleration1. Shift solenoid valve (SLT)
2. Valve body assyDI±656
AT±10
Engine stalls when starting off or stopping1. Shift solenoid valve (SLU)
2. Valve body assyDI±672
AT±10

± 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

D14146
5 V/DIV
1 ms/DIVGND
D14147
GND
5 V/DIV
1 ms/DIV
DI±560
± DIAGNOSTICSAUTOMATIC TRANSMISSION
754 Author: Date:
2005 SEQUOIA (RM1146U)SLT+ (E7±13) ± SLT± (E7±12)
B±R ± G±YSLT solenoid signalEngine idle speedPulse generation
(See waveform 1)
SR (E7±9) ± E1 (E6±1)G±R ± BRSR solenoid signal5th gear10 to 14 V
===1st gearBelow 1 V
SL2+ (E7±17) ± SL2± (E7±16)GR ± LG±BSL2 solenoid signalEngine idle speedPulse generation
(See waveform 3)
SL1+ (E7±19) ± SL1± (E7±18)R±B ± LSL1 solenoid signalEngine idle speedPulse generation
(See waveform 4)
THO1 (E7±24) ± E2 (E8±28)G ± G±WNo.1 ATF temperature
sensor signalNo.1 ATF temperature: 115
C (239

F) or moreBelow 1.5 V
THO2 (E7±32) ± E2 (E8±28)V ± G±WNo.2 ATF temperature
sensor signalNo.2 ATF temperature: 115
C (239

F) or moreBelow 1.5 V
SP2+ (E7±34) ± SP2± (E7±26)W±R ± Y±RSpeed sensor (SP2) sig-
nalVehicle speed 20 km/h (12 mph)Pulse generation
(See waveform 6)
NT+ (E7±35) ± NT± (E7±27)B ± WSpeed sensor (NT) signalEngine idle speedPulse generation
(See waveform 5)
STAR/NSW (E7±8) ± E1 (E6±1)B ± BRPark neutral switch signalIG switch ON and shift lever P and
N positionBelow 2 V
===IG switch ON and shift lever except
P and N position10 to 14 V
L4* (E6±13) ± E1 (E6±1)L±R ± BRTransfer L position switch
signalIG switch ON and transfer L posi-
tionBelow 1 V
===IG switch ON and transfer except L
position10 to 14 V
HINT:
*: 4WD
Waveform 1
Reference:
TerminalSLT+ ± SLT±
Tool setting5V/DIV, 1ms/DIV
Vehicle conditionEngine idle speed
Waveform 2
Reference:
TerminalSLU+ ± SLU±
Tool setting5V/DIV, 1ms/DIV
Vehicle condition5th (lock±up) or 6th (lock±up) gear