2001 TOYOTA SEQUOIA O2 sensor

DIDGG±01
± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI±1511
1705 Author: Date:
2005 SEQUOIA (RM1146U)
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
Using the DATA LIST displayed on the hand±held tester, you can read the value of the switch, sensor, etc.
without parts removal. Reading the DATA LIST as the first step of troubleshooting is one way to shorten the
labor time.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Read the DATA LIST according to the display on the tester.
D±SEAT:
ItemMeasurement Item/
Display (Range)Normal Condition
RECLIN SW REARReclining switch signal (Rearward)/
ON or OFFON: Reclining switch (Rearward) is ON
OFF: Reclining switch (Rearward) is OFF
RECLIN SW FRONTReclining switch signal (Forward)/
ON or OFFON: Reclining switch (Forward) is ON
OFF: Reclining switch (Forward) is OFF
F VTCL SW DOWNFront vertical switch signal (Downward)/
ON or OFFON: Front vertical switch (Downward) is ON
OFF: Front vertical switch (Downward) is OFF
F VTCL SW UPFront vertical switch signal (Upward)/
ON or OFFON: Front vertical switch (Upward) is ON
OFF: Front vertical switch (Upward) is OFF
LIFTER SW DOWNLifter switch signal (Downward)/
ON or OFFON: Lifter switch (Downward) is ON
OFF: Lifter switch (Downward) is OFF
LIFTER SW UPLifter switch signal (Upward)/
ON or OFFON: Lifter switch (Upward) is ON
OFF: Lifter switch (Upward) is OFF
SLIDE SW REARSliding switch signal (Rearward)/
ON or OFFON: Sliding switch (Rearward) is ON
OFF: Sliding switch (Rearward) is OFF
SLIDE SW FRONTSliding switch signal (Forward)/
ON or OFFON: Sliding switch (Forward) is ON
OFF: Sliding switch (Forward) is OFF
POWER VOLTAGEPower supply for position control ECU & switch/
MIN: 0 V, MAX: 19.89 VWithin range from 11 V to 14 V
IG SWIgnition switch status/
ON or OFFON Ignition switch is ON
OFF: Ignition switch is OFF
KEY UNLOCK SWKey unlock warning switch signal/
ON or OFFON: Key is in ignition key cylinder
OFF: Key is not in ignition key cylinder
D±DOOR WARN SWDoor courtesy switch signal/
ON or OFFON: Driver side door is open
OFF: Driver side door is closed
PNP SWPark/neutral position switch signal/
ON or OFFON: Shift lever in neutral position
OFF: Shift lever in any position except neutral
M2 SWSeat memory switch M2 signal/
ON or OFFON: Seat memory switch M2 is ON
OFF: Seat memory switch M2 is OFF
M1 SWSeat memory switch M1 signal/
ON or OFFON: Seat memory switch M1 is ON
OFF: Seat memory switch M1 is OFF
SET SWSeat memory set switch signal/
ON or OFFON: Memory set switch is ON
OFF: Memory set switch is OFF
SLIDE POSSeat sliding position/
MIN: ±4096, MAX: 4096Within range from ±4096 to 4096
RECLN POSSeatback position/
MIN: ±4096, MAX: 4096Within range from ±4096 to 4096
F VTCL POSSeat front vertical position/
MIN: ±4096 MAX: 4096Within range from ±4096 to 4096
LIFTER POSSeat lifter position/
MIN: ±4096 MAX: 4096Within range from ±4096 to 4096
MEM M1 SW
Driving position memorized with seat memory
switch M1/
MEM or NOT MEMMEM: Memorized
NOT MEM: Not memorized

I28447
D24
Seat Memory SwitchBody ECU
SET
4 3 2 1
W±BL
L±Y
G23
22 24
B6
AM1
M2 MM
B6
B6 1
2
EJ8 J/C
IE M1
M2 MRY DI±1518
± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
1712 Author: Date:
2005 SEQUOIA (RM1146U)
Memory switch circuit
CIRCUIT DESCRIPTION
The seat memory switch sends signals to the position control ECU & switch assy via multiplex communica-
tion to memorize a given seat position. This memory system does not use a position sensor. The seat posi-
tion is detected by counting pulses that are output when the motor turns. If there is no pulse output from the
motor, the motor will stop operating. The seat memory switch is later used to send signals to the position
control ECU to return to one of the memorized positions.
The power seat memory operation is performed only when the ignition switch is in the ON position and the
park/neutral position switch is in the P (park) position.
WIRING DIAGRAM
DIDE8±01

I28449
Position Control
ECU & Switch
SLD± SLD+ FRV± FRV+
LFT± LFT+RCL± RCL+ 2 1
21
21
2 13 M7
M7
M7
M7
M7
M7
M7
M724 6
9 7 108
BR P14
Power Seat Motor
(Driver's Seat Front Vertical Control)
P16
Power Seat Motor
(Driver's Seat Reclining Control)P
V W B G
Y L P15
Power Seat Motor
(Driver 's Seat Rear Vertical Control)
P17
Power Seat Motor
(Driver's Seat Slide Control)
± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI±1525
1719 Author: Date:
2005 SEQUOIA (RM1146U)
Power seat motor circuit
CIRCUIT DESCRIPTION
When the power seat control switch is operated, a command signal is sent to the position control ECU. The
position control ECU then controls the appropriate seat motor as needed. This memory system does not use
a seat position sensor. The seat position is detected by counting pulses that are output when the motor turns.
If there is no pulse output from the motor, the motor will stop operating. The ECU is designed so that a mal-
function of the seat memory system will not interfere with manual seat control.
When the position control ECU switch assy detects the low motor speed or abnormal activity, the system
stops the motor. When the motor continuously operates for 120 seconds or more, the system will stop the
motor until the switch is turned off.
WIRING DIAGRAM
DIDEB±01

DI26X±44
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1541
1735 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
If a normal system code is displayed during the DTC check but the problem still occurs, check the circuits
for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting
page.
HINT:
Inspect the ºFuseº and ºRelayº before confirming the suspected areas shown in the table below.
Inspect each suspected area in numerical order, in relation to the corresponding symptom.
If the malfunction still exists after checking and confirming that all the circuits are normal, replace the ECM.
SymptomSuspected AreaSee page
Main switch cannot be turned ON.
(Cruise indicator light in combination meter does not come on.)
1. Cruise control switch circuit
2. CRUISE main indicator light circuit
3. Combination meter system
4. ECMDI±1561
DI±1557
DI±1608
IN±35
Vehicle speed setting cannot be done.
(Although indicator light in combination meter comes on when
main switch is turned ON, it goes off when vehicle speed is set.)1. Cruise control switch circuit
2. ECMDI±1561
IN±35
Setting cannot be done.
(Indicator light in combination meter comes on when main switch
is turned ON and it remains ON while setting.)
1. Cruise control switch circuit
2. Vehicle speed sensor circuit (DTC P0500)
3. Stop light switch circuit (DTC P0571)
4. Park/neutral position switch circuit (DTC P0705)
5. O/D main switch circuit
6. Combination meter system
7. ECMDI±1561
DI±278
DI±1552
DI±576
DI±688
DI±1610
IN±35
While vehicle is driven with cruise control, set control is cancelled.
(Indicator light and CRUISE remain ON.)
1. Cruise control switch circuit
2. Vehicle speed sensor circuit (DTC P0500)
3. Stop light switch circuit (DTC P0571)
4. CRUISE main indicator light circuit
5. Park/neutral position switch circuit (DTC P0705)
6. Combination meter system
7. ECMDI±1561
DI±278
DI±1552
DI±1557
DI±576
DI±1608
IN±35
Hunting
(Speed is not constant.)1. Vehicle speed sensor circuit (DTC P0500)
2. ECMDI±278
IN±35
Setting cannot be cancelled.
(When coast, acceleration, resume, or set speed change function
is operated with control switch.)1. Cruise control switch circuit
2. ECMDI±1561
IN±35
DTC is not output, or is output when it should not be.1. Diagnosis circuitDI±1567
CRUISE main indicator light does not come on.
1. Cruise control switch circuit
2. CRUISE main indicator light circuit
3. Combination meter system
4. ECMDI±1561
DI±1557
DI±1610
IN±35

I11929
CRUISE Main
Indicator Light
BE4034
Indicator Light
1.5 secs.0.5 secs.
ON
OFF DI±1544
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1738 Author: Date:
2005 SEQUOIA (RM1146U)
3. CHECK THE INDICATOR
(a) Turn the ignition switch to the ON position.
(b) Check that the CRUISE main indicator light comes on
when the cruise control main switch ON±OFF button is
pushed on, and that the indicator light goes off when the
ON±OFF button is pushed off.
HINT:
If there is a problem with the indicator, inspect the cruise main
indicator light circuit (see page DI±1557).
HINT:
If a malfunction occurs in the vehicle speed sensors, stop lamp
switch assy, or other related parts during cruise control driving,
the ECM will actuate AUTO CANCEL of the cruise control. The
CRUISE main indicator light will then start to blink, informing the
driver of the malfunction. At the same time, data concerning the
malfunction is stored as a diagnostic trouble code (DTC).

DIDF2±01
A08841DLC3
Hand±held Tester
DI±1548
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1742 Author: Date:
2005 SEQUOIA (RM1146U)
DATA LIST / ACTIVE TEST
DATA LIST
HINT:
According to the DATA LIST displayed by the the hand±held
tester, you can read the values of the switches, the sensors and
so on without parts removal. Reading the DATA LIST as a first
step in troubleshooting is one of the methods to shorten labor
time.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) According to the display on the tester, read the ºDATA
LISTº.
CCS (ECM):
ItemMeasurement Item
/Display (Range)Normal ConditionDiagnostic Note
VEHICLE SPDVehicle speed/min.: 0 km/h (0
mph), max.: 255 km/h (158 mph)Actual vehicle speed±
MEMORY SPD
Cruise control memorized speed
/min.: 36 km/h (22.5 mph), max.:
200 km/h (125 mph)
Actual stored vehicle speed±
THROTTLERequired throttle opening angle
/min.: 0
, max.: 125
Actual required throttle opening
angle±
CRUISE CONTROLCruise control system active
condition/ON or OFFON: Cruise control activated
OFF: Cruise control inactivated±
MAIN SW (MAIN)Main SW signal (Main CPU)
/ON or OFFON: Main SW ON (Pushed on)
OFF: Main SW OFF (Pushed off)±
MAIN SW (SUB)Main SW signal (Sub CPU)
/ON or OFFON: Main SW ON (Pushed on)
OFF: Main SW OFF (Pushed off)±
CCS INDICATORCruise indicator signal (Main CPU)
/ON or OFFON: ºCRUISE main indicatorº ON
OFF: ºCRUISE main indicatorº
OFF
±
CCS INDICATOR SCruise indicator signal (Sub CPU)
/ON or OFFON: ºCRUISE main indicatorº ON
OFF: ºCRUISE main indicatorº
OFF
±
CANCEL SWCANCEL SW signal/ON or OFFON: CANCEL SW ON
OFF: CANCEL SW OFF±
SET/COAST SW±/SET SW signal/
ON or OFFON: ±/SET SW ON
OFF: ±SET OFF±
RES/ACC SW+/RES SW signal/ON or OFFON: +/RES SW ON
OFF: +/RES SW OFF±
STP LIGHT SW2 MStop light SW signal (Main CPU)
/ON or OFFON: Brake pedal depressed
OFF: Brake pedal released±
STP LIGHT SW2 SStop light SW signal (Sub CPU)
/ON or OFFON: Brake pedal depressed
OFF: Brake pedal released±
STP LIGHT SW1 SStop light SW signal (Sub CPU)
/ON or OFFON: Brake pedal depressed
OFF: Brake pedal released±
SHIFT D POSPNP SW signal (D position)
/ON or OFFON: Shift position D
OFF: Any shift position except D±

DI26U±39
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1549
1743 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
If a trouble code is displayed during the DTC check, check the circuit listed for that code. For details of each
code, refer to the ºSee pageº under the respective ºDTC No.º in the DTC chart.
DTC No.
(See Page)Detection ItemTrouble Area
P0500/21
(DI±1551)Vehicle Speed Sensor Circuit Malfunction

Vehicle speed sensor

Vehicle speed sensor signal circuit

ECM
P0503/23
(DI±1551)Vehicle Speed Sensor Circuit Malfunction

Vehicle speed sensor

Vehicle speed sensor signal circuit

ECM
P0571/52
(DI±1552)Stop Light Switch Circuit Malfunction

Stop light switch assy

Stop light switch assy circuit

ECM
P0607/54
(DI±1556)Input Signal Circuit Malfunction
ECM

DI3CI±19
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1551
1745 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT INSPECTION
DTC P0500/21 Vehicle speed sensor circuit malfunction
DTC P0503/23 Vehicle speed sensor circuit malfunction
CIRCUIT DESCRIPTION
See page DI±278.
DTC No.DTC Detection ConditionTrouble Area
P0500/21
This trouble code is output when the vehicle speed signal from
the vehicle speed sensor is cut for 0.14 sec. or more while the
cruise control is in operation.
Vehicle speed sensor

Vehicle speed sensor signal circuit

ECM
P0503/23
Momentary interruption and noise are detected when a rapid
change of vehicle speed occurs while the cruise control is in
operation.
Vehicle speed sensor

Vehicle speed sensor signal circuit

ECM
WIRING DIAGRAM
See page DI±278.
INSPECTION PROCEDURE
See page DI±278.