TOYOTA SEQUOIA 2001 Service Repair Manual

DIDEY±01
I24838
(1)
(3)
I24838
(4)
(1)
(3)
I24838
(1)
(3)
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1539
1733 Author: Date:
2005 SEQUOIA (RM1146U)
ROAD TEST
1. PROBLEM SYMPTOM CONFIRMATION
(a) Inspect the SET function.
(1) Push the ON±OFF button on.
(2) Drive at the required speed (40 km/h (25 mph) or
higher).
(3) Push the cruise control main switch to ±/SET.
(4) Check that the vehicle cruises at the set speed.
(b) Inspect the ACC function.
(1) Push the ON±OFF button on.
(2) Drive at the required speed (40 km/h (25 mph) or
higher).
(3) Push the cruise control main switch to ±/SET.
(4) Check that vehicle speed increases while the cruise
control main switch is pushed to +/RES, and that the
vehicle cruises at the newly set speed when the
switch is released.
(5) Momentarily push the cruise control main switch to
+/RES and then immediately release it. Check that
vehicle speed increases by approximately 1.6 km/h
(1.0 mph) (Tap±up function).
(c) Inspect the COAST function.
(1) Push the ON±OFF button on.
(2) Drive at the required speed (40 km/h (25 mph) or
higher).
(3) Push the cruise control main switch to ±/SET.
(4) Check that vehicle speed decreases while the
cruise control main switch is pushed to ±/SET, and
that the vehicle cruises at the newly set speed when
the switch is released.
(5) Momentarily push the cruise control main switch to
±/SET, and then immediately release it. Check that
vehicle speed decreases by approximately 1.6
km/h (1.0 mph) (Tap±down function).

I24838
(4)(1)
(3)
I24838
(5)
(1)
(3)
DI±1540
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1734 Author: Date:
2005 SEQUOIA (RM1146U)
(d) Inspect the CANCEL function.
(1) Push the ON±OFF button on.
(2) Drive at the required speed (40 km/h (25 mph) or
higher).
(3) Push the cruise control main switch to ±/SET.
(4) When doing any one of the following, check that the
cruise control system deactivates and that the nor-
mal driving mode is reset.

Depressing the brake pedal

Moving the shift lever to any position except
D

Pushing the ON±OFF button off

Pulling the cruise control main switch to CAN-
CEL
Reference: Cruise control will deactivate if VSC starts op-
eration while driving.
(e) Inspect the RES (RESUME) function.
(1) Push the ON±OFF button on.
(2) Drive at the required speed (40 km/h (25 mph) or
higher).
(3) Push the cruise control main switch to ±/SET.
(4) When doing any one of the following, check that the
cruise control system deactivates and that the nor-
mal driving mode is reset.

Depressing the brake pedal

Moving the shift lever to any position except
D

Pulling the cruise control main switch to CAN-
CEL
(5) After pushing the cruise control main switch to
+/RES while driving, check that the vehicle resumes
the speed set prior to the cancellation.

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

DI3CH±22
I28458
E8E7 E6 E5 E4
DI±1542
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1736 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECM
Symbols (Terminals No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
TC (E4±23) ± E1 (E6±1)P±B ± BRDTC output signalIgnition switch on10 to 14 V
TC (E4±23) ± E1 (E6±1)P±B ± BRDTC output signalIgnition switch on, connect terminals
TC and CG of DLC3Below 1 V
ST1± (E4±16) ± E1 (E6±1)L±B ± BRCruise cancel input signalIgnition switch on, depress brake
pedalBelow 1 V
ST1± (E4±16) ± E1 (E6±1)L±B ± BRCruise cancel input signalIgnition switch on, release brake
pedal10 to 14 V
STP (E4±15) ± E1 (E6±1)G±Y ± BRStop light switch input sig-
nalIgnition switch on, depress brake
pedal10 to 14 V
STP (E4±15) ± E1 (E6±1)G±Y ± BRStop light switch input sig-
nalIgnition switch on, release brake
pedalBelow 1 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on10 to 14 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on, CANCEL switch
held ON6.6 to 10.1 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on, +/RES switch
held ON4.5 to 7.1 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on, ±/SET switch
held ON2.3 to 4.0 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on, MAIN switch held
ONBelow 1 V
SPD (E5±8) ±E1 (E6±1)G±O ± BRSpeed signalIgnition switch on, rotate driving
wheel slowlyPulse generation
(see page DI±278)
D (E5±21) ±E1 (E6±1)W±R ± BRD shift position switch in-
put signalIgnition switch on, shift lever D posi-
tion10 to 14 V
D (E5±21) ±E1 (E6±1)W±R ± BRD shift position switch in-
put signalIgnition switch on, shift lever any
position except DBelow 1 V
PI (E5±18) ±E1 (E6±1)LG±R ± BRCruise indication signalIgnition switch on, MAIN switch
OFF10 to 14 V
PI (E5±18) ±E1 (E6±1)LG±R ± BRCruise indication signalIgnition switch on, MAIN switch onBelow 1 V

A08841
Hand±held Tester
DLC3
DIDEZ±01
A04550
DLC3 1 2345678
9
10 11 12 1314 15 16
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1543
1737 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
1. DESCRIPTION
The ECM controls the cruise control system of the vehicle. The
data and DTCs relating to the cruise control system can be read
from the DLC3 of the vehicle. If no DTCs are output when
checking for DTCs, there may be a problem with the combina-
tion meter or the multiplex communication system.
Use the hand±held tester or SST to check and solve the prob-
lem.
SST 09843±18040
2. CHECK THE DLC3
The vehicle's ECM uses ISO 9141±2 for communication. The
terminal arrangement of the DLC3 complies with SAE J1962
and matches the ISO 9141±2 format.
Symbols (Terminals No.)Terminal DescriptionConditionSpecified Condition
SIL(7) ± SG(5)Bus º+º lineDuring transmissionPulse generation
CG(4) ± Body groundChassis groundAlwaysBelow 1 W
SG(5) ± Body groundSignal groundAlwaysBelow 1 W
BAT(16) ± Body groundBattery positiveAlways11 to 14 V
HINT:
If the display shows ºUNABLE TO CONNECT TO VEHICLEº af-
ter connecting the hand±held tester to the DLC3, turning the
ignition switch to the ON position and operating the tester, there
is a problem on either the vehicle side or the tool side.

If communication is normal when the tool is connected to
another vehicle, inspect the DLC3 on the original vehicle.

If communication is still impossible when the tool is con-
nected to another vehicle, the problem is probably in the
tool itself, so consult the Service Department listed in the
tool's instruction manual.

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).

DIDF0±01
A04550
TC CG
1 2345678
9
10 11 12 1314 15 16
I11929
CRUISE Main
Indicator Light
I28693
Normal System Code:
ON
OFF
Code 52
Code 21 0.25 sec.
0.25 sec.
ON
OFFDiagnostic Trouble Code:
4.5 sec. 2.5 sec. 1.5 sec. 0.5 sec.
0.5 sec.
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1545
1739 Author: Date:
2005 SEQUOIA (RM1146U)
DTC CHECK / CLEAR
1. DTC CHECK (USING SST CHECK WIRE)
(a) Using SST check wire, connect terminals TC and CG
of
the DLC3.
SST 09843±18040
(b) Turn the ignition switch to the ON position.
(c) Read and record DTCs from the CRUISE main indicator
light on the combination meter. As examples, refer to the
chart below for the blinking patterns of the normal system
code, and diagnostic trouble codes 21 and 52.
(d) Refer to the Diagnostic Trouble Code Chart (see page
DI±1549) for DTC information.
2. DTC CLEAR (USING SST CHECK WIRE)
Remove the EFI No.1 and ETCS fuses from the engine room
J/B for more than 60 seconds, or disconnect the battery termi-
nal for more than 60 seconds.

A08841DLC3
Hand±held Tester
DI±1546
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1740 Author: Date:
2005 SEQUOIA (RM1146U)
3. DTC CHECK (USING HAND±HELD TESTER)
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Read the DTCs on the tester screen.
4. DTC CLEAR (USING HAND±HELD TESTER)
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Clear the DTCs following the prompts on the tester
screen.

DIDF1±01
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1547
1741 Author: Date:
2005 SEQUOIA (RM1146U)
FAIL±SAFE CHART
If the following condition is detected while the cruise control is in operation, the system will clear
the stored vehicle speed in the ECM and cancel the cruise control operation.
Vehicle ConditionAuto Cancel ConditionRe±operation Condition
The CRUISE main indicator light blinks.

There is an open or short in the stop light switch
circuit.

There is a problem with the vehicle speed sig-
nal.

There is a problem with the throttle position sen-
sor and motor.

There is a problem with the input circuit of the
stop light switch circuit.

There is a problem with the cancel circuit.

Push the ON±OFF button of the cruise control
main switch on again.

Turn the ignition switch off.

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±