2001 TOYOTA SEQUOIA brake

DIDHZ±01
F19815
: CAN Main Bus Line
(CAN±H) DLC3
120 W
± 10%
Suspension
Control ECU ECM
: CAN Main Bus Line
(CAN±L)
: CAN Sub Bus Line
(CAN±H) : CAN Sub Bus Line
(CAN±L)120 W
± 10% Serial Communication Line
Translate ECU
*1: w/ Air Suspension System*1 *1Junction
Connector
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1063
1257 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM
HINT:

The ECM uses the CAN communication system to perform DTC communication instead of the conven-
tional serial communication line (SIL).

The translate ECU outputs DTCs only via the BRAKE warning light. Therefore, the DTCs cannot be
checked on the hand±held tester display via the CAN VIM.

DIDI7±01
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1075
1269 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
1. DTC TABLE BY ECU
HINT:

If CAN communication system DTCs are output, trouble cannot be determined only by the DTCs. Per-
form troubleshooting according to ºHOW TO PROCEED WITH TROUBLESHOOTINGº (see page
DI±1065).
(a) Skid Control ECU
HINT:

DTC communication uses the SIL line.

If C1201/51, C1202/52 or C1203/53 is output from skid control ECU, perform troubleshooting of each
diagnosis code (see page DI±921).
DTC No.Detection Item
U0100/65Lost Communication With ECM/PCM ºAº
(b) ECM
HINT:
The ECM is connected to the CAN communication system, but CAN communication system DTCs are not
output.
(c) Translate ECU
HINT:
The translate ECU outputs DTCs only via the BRAKE warning light. Therefore, the DTCs cannot be checked
on the hand±held tester display via the CAN VIM.
DTC No.Detection Item
65Abnormalities in EFI communication
94Abnormalities in CAN communication
(d) Suspension Control ECU
HINT:
DTC communication uses the SIL line.
DTC No.Detection Item
U0100/65Lost Communication With ECM/PCM ºAº
U0122/67Lost Communication With Vehicle Dynamics Control Module
U0132/74Lost Communication With Ride Level Control Module

DI26S±26
CRUISE CONTROL SYSTEM Check Sheet
Inspector 's name:
Customer 's Name
Date Vehicle
Odometer Reading / /
Condition of
Problem Occurrence
Date Problem
Frequency
Occurred
Problem Occurs
Vehicle Speed when
Problem Occurred / /
Continuous Intermittent ( Times a day)
km
mile Brought in
Auto cancel
occurs
Driving condition
 City driving  Freeway  Uphill  Downhill

After cancel occurred, did the driver activate cruise control
again?
 Yes  No
 Cancel does not
occur With brake ON
 Shifting into any position except D
 When control SW is pulled to CANCEL position
 Cruise control
malfunction Slip to acceleration side
 Slip to deceleration side
 Hunting occurs
 O/D cut±off does not occur
 O/D does not return
 Switch
malfunction SET  ACCEL  COAST  RESUME  CANCEL
 Remains ON  Does not light up  Blinks Symptoms
DTC Check1st Time2nd Time
 Normal System Code  Trouble Code (Code )
 Normal System Code  Trouble Code (Code )  CRUISE main
indicator lightVIN
Production Date
Licence Plate No.
km
mile DI±1538
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1732 Author: Date:
2005 SEQUOIA (RM1146U)
CUSTOMER PROBLEM ANALYSIS CHECK

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.

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

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±

I24840
Battery 117
1E
AM2
1 2W±RI18
Ignition SW
B±R
IG2
85E4ECM
ST1± 1
STOP16
5 S14
Stop Light SW
7G±Y
3
6E4STP
1C B±O
3
F10 FL Block
ALT IGN1
B B
W
1F 1L1
2D 2C15
W±RAM2
ST2
1C2
1J 2
4A2 B±OW4
2G±Y
Instrument Panel J/B
Sub J/B No. 4
Engine Room J/B
Instrument Panel J/B4L±B Sub J/B No. 4
4D1
1
4A4E DI±1552
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1746 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0571/52 Stop light switch circuit malfunction
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light switch assy sends a signal to the ECM. When the ECM
receives this signal, it cancels the cruise control.
Fail±safe function operates to enable normal driving even if there is a malfunction in the stop light signal
circuit.
The cancel condition occurs when positive battery voltage is applied to terminal STP.
When the brake is applied, battery positive voltage is normally applied to terminal STP of the ECM through
the STOP fuse and the stop light switch assy, and the ECM turns the cruise control off.
DTC No.DTC Detection ConditionTrouble Area
P0571/52Stop light switch does not turn off even once the vehicle is
driven
Stop light switch assy

Stop light switch assy circuit

ECM
WIRING DIAGRAM
DIAB6±05

± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1553
1747 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
When using the hand±held tester, start the inspection from step 1 and when not using the hand±held tester,
start from step 2.
1 Read value on hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position, and turn the hand±held tester main switch on.
(c) Select the item ºSTP LIGHT SW2 Mº, ºSTP LIGHT SW2 Sº and ºSTP LIGHT SW1 Sº in the DATA LIST,
and read its value displayed on the hand±held tester.
CHECK:
Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal
is released.
CCS (ECM):
ItemMeasurement Item
/Display (Range)Normal ConditionDiagnostic Note
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±
OK:
When the brake pedal is operated, the normal conditions listed above are shown on the display.
RESULT:
NGA
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)B
OK (When troubleshooting according to the DTC chart)C
B Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1541).
C Replace ECM (See page IN±35).
A