2001 TOYOTA SEQUOIA warning

DIDIK±01
D13871
Combination Meter
DLC3 Stop Light SwitchECM
Park/Neutral Position SwitchSpeed Sensor (SP2) Shift Solenoid Valve S1
Shift Solenoid Valve SR
Shift Solenoid Valve SLU
Shift Solenoid Valve SL2 ATF Temperature
Sensor No. 2Integration Control and Panel
(Shift Position L Switch)
MIL
Shift Solenoid Valve SL1
Shift Solenoid
Valve SLT
ATF Temperature
Sensor No.1
Shift Solenoid Valve S2
Speed Sensor (NT)

AT Oil Temp Warning LightShift Lever
(O/D Main Switch)
4WD:
4WD Control ECU
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±519
713 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION

DIDIL±01
D14205
Shift Solenoid Valve S1
MIL
(Malfunction Indicator Lamp) S1
S2
SL1
SL2
SLT
SLU
SR
WShift Solenoid Valve S2
Shift Solenoid Valve SL1
Shift Solenoid Valve SL2
Shift Solenoid Valve SLT
Shift Solenoid Valve SLU
Shift Solenoid Valve SR
OILW
AT Oil Temp Warning Light ECM Crankshaft Position Sensor
Engine CoolantTemperature Sensor
Combination Meter
Stop Lamp Switch Assy
DLC3
(Data Link Connector 3)THW VTA1, 2
VC
SPD
STPTH01
TC Throttle Position Sensor
ATF (Automatic Transmission
Fluid) Temperature Sensor No. 1Mass Air Flow Meter
Accelerator Pedal Position SensorVPA
VPA2
Shift Lever
(O/D Main Switch)
Input Speed Sensor (NT)NT
Output Speed Sensor (SP2)SP2
TH02
ATF (Automatic Transmission
Fluid) Temperature Sensor No. 2Skid Control ECUNSW
Park/Neutral Position Switch
R, D, 3, 2
VG
NE
L
ODMSIntegration Control and Panel
(Shift Position L Switch)
L4



: 4WD4WD Control ECU
CAN DI±520
± DIAGNOSTICSAUTOMATIC TRANSMISSION
714 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM
The configuration of the electronic control system in the A750E/A750F automatic transmission is as shown
in the following chart.

DIDIP±01
12345678
9 10111213141516
D13649
DLC3:
CG
TC
D13654
DI±524
± DIAGNOSTICSAUTOMATIC TRANSMISSION
718 Author: Date:
2005 SEQUOIA (RM1146U)
BASIC INSPECTION
1. CHECK FLUID LEVEL
(a) Using SST, create a short±circuit between terminals TC
and CG of the DLC3.
SST 09843±18040
(b) Start the engine and run at idle.

The A/C switch must be turned off.

On models with active height control suspension &
adaptive variable suspension, turn the height con-
trol switch off.
(c) Slowly move the shift lever through all positions from P to
L, and move it back to the P position.
(d) Switch to the fluid temperature detection mode.
Move the shift lever from the N to the D position, or from
D to N, within 1.5 seconds. (Repeat this operation for 6 se-
conds or more.)
OK: The A/T OIL TEMP warning light comes on for 2
seconds and then goes off.
(e) Return the shift lever to the P position and disconnect ter-
minals TC and CG.
(f) Idle the engine to raise oil temperature.
(g) Lift up the vehicle immediately after the meter indicator
light (ATF temperature warning light) comes on.

The A/T OIL TEMP warning light indicates the ATF
temperature according to the following table.
ATF Temp.Less than optimized
temperatureOptimized temperatureMore than optimized
temperature
A/T OIL TEMP warning lightOFFONBlinking

D13654
D14231
When fluid
temperature
is low: offWhen fluid
temperature
is correct: onWhen fluid
temperature
is high: blinks
D14139Overflow Plug
DI±530
± DIAGNOSTICSAUTOMATIC TRANSMISSION
724 Author: Date:
2005 SEQUOIA (RM1146U)
(11) Switch to the fluid temperature detection mode.
Move the shift lever from the N to the D position, or
from D to N, within 1.5 seconds. (Repeat this opera-
tion for 6 seconds or more.)
OK: The A/T OIL TEMP warning light comes on for 2
seconds and then goes off.
(12) Disconnect terminals TC and CG after confirming
the above condition.
(13) Idle the engine to raise the fluid temperature.
(14) Lift up the vehicle immediately after the meter indi-
cator light (ATF temperature warning light) comes
on.
NOTICE:

Add fluid only when the meter indicator light is on.

Perform this procedure while the engine is idling.
(15) Remove the overflow plug. If ATF overflows, pro-
ceed to [*2].
If ATF does not overflow, proceed to [*3].
HINT:
ºOverflowº indicates the condition under which ATF drains out
from the overflow tube.
NOTICE:
Capacity of the overflow tube is approximately 3 cc.

D14141
12345678
9 10111213141516
D13649
DLC3:
CG
TC
D13654
DI±532
± DIAGNOSTICSAUTOMATIC TRANSMISSION
726 Author: Date:
2005 SEQUOIA (RM1146U)
(3) Install the overflow plug with a new gasket when the
draining ATF has becomes a trickle.
Torque: 20 NVm (204 kgfVcm, 15 ftVlbf)
(4) Install the refill plug with a new O±ring.
Torque: 39 NVm (400 kgfVcm, 29 ftVlbf)
(5) Lower down the vehicle.
(6) Turn the ignition switch off.
(7) Check for fluid leaks in the transmission.
If there are leaks, it is necessary to repair or replace O±rings,
FIPGs, oil seals, plugs or other related parts.
(d) When adding a minimum amount of fluid: [*4]
(1) Using SST, create a short±circuit between terminals
TC and CG of the DLC3.
SST 09843±18040
(2) Start the engine and run at idle.
NOTICE:
The A/C switch must be turned off.
(3) Slowly move the shift lever from the P to the 2±L
position. Return the shift lever to the P position.
(4) Switch to the fluid temperature detection mode.
Move the shift lever from the N to the D position, or
from D to N, within 1.5 seconds. (Repeat this opera-
tion for 6 seconds or more.)
OK: The A/T OIL TEMP warning light comes on for 2
seconds and then goes off.
(5) Disconnect terminals TC and CG after confirming
the above condition.
(6) Idle the engine to raise the fluid temperature.

D14231
When fluid
temperature
is low: offWhen fluid
temperature
is correct: onWhen fluid
temperature
is high: blinks
D14139Overflow Plug
D14141
D14140
Refill Plug
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±533
727 Author: Date:
2005 SEQUOIA (RM1146U)
(7) Lift up the vehicle immediately after the meter indi-
cator light (ATF temperature warning light) comes
on.
NOTICE:

Add fluid only when the meter indicator light is on.

Perform this procedure while the engine is idling.
(8) Remove the overflow plug. If ATF overflows, pro-
ceed to [*5]. If ATF does not overflow, proceed to
[*6].
HINT:
ºOverflowº indicates the condition under which ATF drains out
from the overflow tube.
(e) When fluid overflows: [*5]
(1) Install the overflow plug with a new gasket when the
draining ATF has become a trickle.
Torque: 20 NVm (204 kgfVcm, 15 ftVlbf)
(2) Install the refill plug with a new O±ring.
Torque: 39 NVm (400 kgfVcm, 29 ftVlbf)
(3) Lower down the vehicle.
(4) Turn the ignition switch off.
(5) Check for fluid leaks in the transmission.
If there are leaks, it is necessary to repair or replace O±rings,
FIPGs, oil seals, plugs or other related parts.
(f) When fluid does not overflow: [*6]
(1) Remove the refill plug.

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±666
± DIAGNOSTICSAUTOMATIC TRANSMISSION
860 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2740 Transmission Fluid Temperature Sensor ºBº
Circuit
DTC P2742 Transmission Fluid Temperature Sensor ºBº
Circuit Low Input
DTC P2743 Transmission Fluid Temperature Sensor ºBº
Circuit High Input
CIRCUIT DESCRIPTION
ATF (Automatic Transmission Fluid) temperature sensor No.2 is on the transmission and just in front of the
oil cooler inlet pipeline.
If ECM detects the abnormally high temperature of ATF by this sensor, it draws driver's attention by illuminat-
ing the warning lamp.
HINT:

The temperature of ATF easily rises when towing, climbing hills and in traffic, etc.

If the ATF temperature sensor No.2 becomes short±circuited, the signal that indicates the ATF temper-
ature is 150C (302F) or higher is input in ECM.
Vehicle conditions when the sensor is normal and when the sensor is short±circuited are indicated
in the table below.
ATF temperature Sensor No.2
StateDetection ConditionSymptomRecovery Condition

AT fluid temp. more than 150C
(302F).
AT Oil Temp. warning light re-
mains on
AT fluid temp. less than 135C
(275F). *2

AT fluid temp. more than 130C
(266F).
Shift point too high.
AT fluid temp. less than 110C
(230F).
Sensor is normalWhen the conditions (a) and (b)
are satisfied.
(a) AT fluid temp. more than 130C
(266F).
(b) Engine coolant temp. more
than 95C (203F).

Lock±up at 3rd gear. *1
AT fluid temp. less than 110C
(230F) *2 and engine coolant
temp. less than 95C (203F).
Sensor is short±circuited

Any conditions.

AT Oil Temp. warning light re-
mains on

Shift point too high.

Symptoms still occur
Sensor is short circuited

Engine coolant temp. more than
95C (203F).
Lock±up at 3rd gear. *1
Symptoms still occur
HINT:
*1: When AT fluid temperature is normal, transmission locks up at 5th gear with the shift lever in D position
and at 4th gear with the shift lever in 4 position.
*2: When AT fluid temperature is in normal range, it decreases to less than 135C (275F) within 5 minutes
with the shift lever in P or N position in an idling state.
DIDJN±01