TOYOTA SEQUOIA 2001 Service Repair Manual

DIDIY±01
D14145
E8E7E6E5E4
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±559
753 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECM
1. ECM
HINT:
Each ECM terminal's standard voltage is shown in the table below.
In the table, first follow the information under ºConditionº. Look under ºSymbols (Terminal No.)º for the termi-
nals to be inspected. The standard voltage between the terminals is shown under ºSpecific Conditionº.
Use the illustration above as a reference for the ECM terminals.
Symbols (Terminals No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
LMS (E5±9) ± E1 (E6±1)P±L ± BRL shift position switch sig-
nalIG switch ON10 to 14 V
===IG switch ON and Press continu-
ously shift position L switchBelow 1 V
2 (E5±10) ± E1 (E6±1)L ± BR2 shift position switch sig-
nalIG switch ON and shift lever 2 and L
position10 to 14 V
===IG switch ON and shift lever except
2 and L positionBelow 1 V
R (E5±11) ± E1 (E6±1)B±Y ± BRR shift position switch sig-
nalIG switch ON and shift lever R posi-
tion10 to 14 V
===IG switch ON and shift lever except
R positionBelow 1 V
D (E5±21) ± E1 (E6±1)W±R ± BRD shift position switch sig-
nalIG switch ON and shift lever D and
4 position10 to 14 V
===IG switch ON and shift lever except
D and 4 positionBelow 1 V
3 (E5±19) ± E1 (E6±1)L ± BR3 shift position switch sig-
nalIG switch ON and shift lever 3 posi-
tion10 to 14 V
===IG switch ON and shift lever except
3 positionBelow 1 V
ODMS (E4±12) ± E1 (E6±1)L±W ± BRO/D main switch signalIG switch ON10 to 14 V
===IG switch ON and press continu-
ously O/D main switchBelow 1 V
STP (E4±15) ± E1 (E6±1)G±Y ± BRStop lamp switch signalBrake pedal is depressed7.5 to 14 V
===Brake pedal is releasedBelow 1.5 V
SLU+ (E7±15) ± SLU± (E7±14)P±L ± L±WSLU solenoid signal5th (lock±up) gearPulse generation
(See waveform 2)
S2 (E7±10) ± E1 (E6±1)W±L ± BRS2 solenoid signal2nd or 3rd gear10 to 14 V
===1st, 4th or 5th gearBelow 1 V
S1 (E7±11) ± E1 (E6±1)R ± BRS1 solenoid signal1st or 2nd gear10 to 14 V
===3rd, 4th or 5th gearBelow 1 V

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

D14146
5 V/DIV
1 ms/DIVGND
D14146
5 V/DIV
1 ms/DIVGND
D14148
GND
1 V/DIV
2 ms/DIV
C13480D14149
GND
2 V/DIV
20 ms/DIV
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±561
755 Author: Date:
2005 SEQUOIA (RM1146U)
Waveform 3
Reference:
TerminalSL2+ ± SL2±
Tool setting5V/DIV, 1ms/DIV
Vehicle conditionEngine idle speed
Waveform 4
Reference:
TerminalSL1+ ± SL1±
Tool setting5V/DIV, 1ms/DIV
Vehicle conditionEngine idle speed
Waveform 5
Reference:
TerminalNT+ ± NT±
Tool setting1V/DIV, 2ms/DIV
Vehicle conditionEngine idle speed (P or N position)
Waveform 6
Reference:
TerminalSP2+ ± SP2±
Tool setting2V/DIV, 20ms/DIV
Vehicle conditionVehicle speed 20 km/h (12 mph)

DIDIZ±01
D14150
D13872DLC3
OBD II Scan Tool
(Hand±held Tester)
CAN VIM
D14151
DLC3
1314 1516 12 11 10 9 12345678 DI±562
± DIAGNOSTICSAUTOMATIC TRANSMISSION
756 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
DESCRIPTION
When troubleshooting On±Board Diagnostic (OBD II) vehicles,
the vehicle must be connected to the OBD II scan tool (comply-
ing with SAE J1987). Various data output from the vehicle's
ECM can then be read.
OBD II regulations require that the vehicle's on±board comput-
er illuminates the Malfunction Indicator Lamp (MIL) on the
instrument panel when the computer detects a malfunction in:
1) The emission control system/components
2) The powertrain control components (which affect vehicle
emissions)
3) The computer
In addition, the applicable Diagnostic Trouble Codes (DTCs)
prescribed by SAE J2012 are recorded in the ECM memory.
If the malfunction does not reoccur in 3 consecutive trips, the
MIL turns off automatically but the DTCs remain recorded in the
ECM memory.
To check DTCs, connect the scan tool to the Data Link Connec-
tor 3 (DLC3) of the vehicle. The scan tool displays DTCs, the
freeze frame data and a variety of the engine data.
The DTCs and freeze frame data can be erased with the scan
tool (See page DI±565).
NORMAL MODE AND CHECK MODE
The diagnosis system operates in ºnormal modeº during normal
vehicle use. In normal mode, º2±trip detection logicº is used to
ensure accurate detection of malfunctions. ºCheck modeº is
also available to technicians as an option. In check mode,
º1±trip detection logicº is used for simulating malfunction symp-
toms and increasing the system's ability to detect malfunctions,
including intermittent malfunctions.
2±TRIP DETECTION LOGIC
When a malfunction is first detected, the malfunction is tempo-
rarily stored in the ECM memory (1st trip). If the ignition switch
is turned OFF and then ON again, and the same malfunction is
detected again, the MIL will illuminate.



D14152
DTC was set.
0.5 sec. 0.5 sec. 0.5 sec.
 : Freeze frame data which can be read
D14151
DLC3
1314 1516 12 11 10 9 12345678
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±563
757 Author: Date:
2005 SEQUOIA (RM1146U)
FREEZE FRAME DATA
Freeze frame data records the engine conditions (fuel system,
calculated load, engine coolant temperature, fuel trim, engine
speed, vehicle speed, etc.) when a malfunction is detected.
When troubleshooting, freeze frame data can help determine
if the vehicle was running or stopped, if the engine was warmed
up or not, if the air/fuel ratio was Lean or Rich, and other data
from the time the malfunction occurred.
The hand±held tester records freeze frame data in five different
instances: 1) 3 times before the DTC is set, 2) once when the
DTC is set, and 3) once after the DTC is set. These data can be
used to simulate the vehicle's condition around the time when
the malfunction occurred. The data may help find the cause of
the malfunction, or judge if the DTC is being caused by a tempo-
rary malfunction or not.
DLC3 (Data Link Connector 3)
The vehicle's ECM uses the ISO 15765±4 for communication
protocol. The terminal arrangement of the DLC3 complies with
SAE J1962 and matches the ISO 15765±4 format.
HINT:
Connect the cable of the hand±held tester to the DLC3, turn the
ignition switch ON and attempt to use the hand±held tester. If
the screen displays UNABLE TO CONNECT TO VEHICLE, a
problem exists in the vehicle side or the tester side.
If the communication is normal when the tool is connected to
another vehicle, inspect the DLC3 on the original vehicle.
If the communication is still impossible when the tool is con-
nected to another vehicle, the problem is probably in the tool it-
self. Consult the Service Department listed in the tool's instruc-
tion manual.
SymbolTerminal No.NameReference terminalResultCondition
SIL7Bus º+º line5 ± Signal groundPulse generationDuring transmission
CG4Chassis groundBody groundBelow 1 WAlways
SG5Signal groundBody groundBelow 1 WAlways
BAT16Battery positiveBody ground11 to 14 VAlways
CANH6HIGH±level CAN
bus lineCANL54 to 69 WIG switch OFF
CANH6HIGH±level CAN
bus lineBattery positive1 MW or higherIG switch OFF
CANH6HIGH±level CAN
bus lineCG1 kW or higherIG switch OFF
CANL14LOW±level CAN
bus lineBattery positive1 MW or higherIG switch OFF
CANL14LOW±level CAN
bus lineCG1 kW or higherIG switch OFF

DI±564
± DIAGNOSTICSAUTOMATIC TRANSMISSION
758 Author: Date:
2005 SEQUOIA (RM1146U)
CHECK BATTERY VOLTAGE
Battery voltage: 11 to 14 V
If voltage is below 11 V, replace the battery before proceeding.
CHECK MIL
(a) Check that the MIL illuminates when turning the ignition
switch ON.
If the MIL does not illuminate, there is a problem in the MIL cir-
cuit (refer to MIL CIRCUIT on page DI±512)
(b) When the engine is started, the MIL should turn off.
ALL READINESS
For this vehicle, using the hand±held tester allows readiness
codes corresponding to all DTCs to be read. When diagnosis
(normal or malfunctioning) has been complete, readiness
codes are set. Enter the following menus: ENHANCED OBD II
/ MONITOR STATUS on the hand±held tester.

DIDJ0±01
D13872DLC3
OBD II Scan Tool
(Hand±held Tester)
CAN VIM
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±565
759 Author: Date:
2005 SEQUOIA (RM1146U)
DTC CHECK / CLEAR
1. CHECK DTC
DTCs which are stored in the ECM can be displayed with the
hand±held tester or generic OBD II scan tool.
These scan tools can display pending DTCs and current DTCs.
Some DTC aren't stored if the ECM doesn't detect a malfunc-
tion during consecutive driving. However, the detected mal-
function during once driving is stored as pending DTC.
(a) Connect the hand±held tester to the Controller Area Net-
work Vehicle Interface Module (CAN VIM). Then connect
the CAN VIM to the Data Link Connector 3 (DLC3).
(b) Turn the ignition switch ON.
(c) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES (or PENDING
CODE).
(d) Confirm the DTCs and freeze frame data and then write
them down.
(e) See page DI±573 to confirm the details of the DTCs.
NOTICE:
When simulating a symptom with the scan tool to check for
DTCs, use normal mode. For codes on DIAGNOSTIC
TROUBLE CODE CHART subject to º2±trip detection log-
icº, perform the following actions.
Turn the ignition switch OFF after the symptom is simulated
once. Then repeat the simulation process again. When the
problem has been simulated twice, the MIL illuminates and the
DTCs are recorded in the ECM.
2. CLEAR DTC
(a) Connect the hand±held tester to the CAN VIM. Then con-
nect the CAN VIM to the DLC3.
(b) Turn the ignition switch ON.
(c) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CLEAR CODES and press YES.

DIDJ1±01
D13872DLC3
OBD II Scan Tool
(Hand±held Tester)
CAN VIM
D14153
ON
OFF
0.13 seconds0.13 seconds DI±566
± DIAGNOSTICSAUTOMATIC TRANSMISSION
760 Author: Date:
2005 SEQUOIA (RM1146U)
CHECK MODE PROCEDURE
DESCRIPTION
Check mode has a higher sensitivity to malfunctions and can
detect malfunctions that normal mode cannot detect. Check
mode can also detect all the malfunctions that normal mode can
detect. In check mode, DTCs are detected with 1±trip detection
logic.
CHECK MODE PROCEDURE
(a) Make sure that the items below are true:
(1) Battery positive voltage 11 V or more
(2) Throttle valve fully closed
(3) Transmission in the P or N position
(4) A/C switched OFF
(b) Turn the ignition switch OFF.
(c) Connect the hand±held tester together with the Controller
Area Network Vehicle Interface Module (CAN VIM) to the
DLC3.
(d) Turn the ignition switch ON.
(e) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / CHECK MODE.
(f) Change the ECM to check mode. Make sure the MIL
flashes as shown in the illustration.
NOTICE:
All DTCs and freeze frame data recorded will be erased if:
1) the hand±held tester is used to change the ECM from
normal mode to check mode or vice±versa; or 2) during
check mode, the ignition switch is turned from ON to ACC
or LOCK.
Before check mode, make notes of the DTCs and freeze
frame data.
(g) Start the engine. The MIL should turn off after the engine
starts.
(h) Perform ºMONITOR DRIVE PATTERNº for the ECT test
(See page DI±551).
(Or, simulate the conditions of the malfunction described
by the customer).
(i) After simulating the malfunction conditions, use the
hand±held tester diagnosis selector to check the DTC
and freeze frame data.

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.

NORMAL S1 OFF S2 OFF SR OFF
ºRºGear
ºDº
º3º
º2º
ºLº
S1S2Gear GearSR SL1 SL2GearS1 S2 SR SL1 SL2 S1 S2 SR SL1 SL2 S1 S2 SR SL1 SL2
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
""
"
"
"
"
"
"
"
"
RRR R
1 st
1 st
1 st1 st 1 st
1 st 1 st
1 st 1 st 1 st
1 st E/B 1 st E/B 1 st E/B 1 st E/B
2 nd E/B
3 rd E/B
4 th
5 th
3 rd E/B 3 rd E/B2 nd E/B
2 nd
4 th 4 th
5 th 5 th
"
2 nd E/B"
4 th 4 th4 th 4 th 4 th 4 th 3 rd 3 rd3 rd
3 rd 4 th
"
5 th 5 th5 th 4 th
"
3 rd E/B
"
3 rd E/B
3 rd E/B 3 rd E/B
5 th 5 th
2 nd E/B
3 rd E/B
5 th 5 th4 th
3 rd E/B 3 rd E/B
4 th
1 st E/B
"
2 nd
" "
5 th1 st E/B"
2 nd Fail 4th
"
3 rd E/B
3 rd E/B
4 th
5 th3 rd
""
2 nd
2 nd
2 nd
2 nd 2 nd 2 nd 2 nd 2 nd
2 nd
3 rd E/B 3 rd E/B
"
"
"
"
3 rd
3 rd
3 rd 1 st
1 st
1 st1 st 3 rd
4 th
4 th
4 th
4 th
Fail 4 th
"
3 rd 4 th
"
Position
DI±568
± DIAGNOSTICSAUTOMATIC TRANSMISSION
762 Author: Date:
2005 SEQUOIA (RM1146U)
: ON
X: OFF

": Condition in the electrical malfunction is shown on the left of º"º.
Condition in the fail±safe mode is shown on the right of º"º.
E/B: Engine brake.