Toyota Sequoia (2005). Manual - part 319

B17410

ECM:

CANL

CANH

E5

F19578

ECM Wire Harness View:

E4

E5

E8

BATT

E0I

CANL

CANH

–

DIAGNOSTICS

CAN COMMUNICATION SYSTEM

DI–1071

1265

5.

ECM

(a)

Measure the resistance according to the value(s) in the
table below.

Standard:

Terminals

Condition

Specified Value

E5–33 (CANH) – E5–34 (CANL)

Ignition Switch OFF

108 to 132 

Ω

(b)

Measure the resistance according to the value(s) in the
table below.

Standard:

Terminals

Wiring Color

Condition

Specified Value

E5–33 (CANH) – E5–34 (CANL)

L – W

Ignition Switch OFF

108 to 132 

Ω

E5–33 (CANH) – E8–7 (E0I)

L – W–B

Ignition Switch OFF

3 k

Ω

 or more

E5–34 (CANL) – E8–7 (E0I)

W – W–B

Ignition Switch OFF

3 k

Ω

 or more

E5–33 (CANH) – E4–3 (BATT)

L – B–Y

Ignition Switch OFF

1 M

Ω

 or more

E5–34 (CANL) – E4–3 (BATT)

W – B–Y

Ignition Switch OFF

1 M

Ω

 or more

F16805

Suspension Control ECU
Wire Harness View:

S25

GND

BAT

CANH

CANL

DI–1072

–

DIAGNOSTICS

CAN COMMUNICATION SYSTEM

1266

6.

Suspension Control ECU

(a)

Measure the resistance according to the value(s) in the
table below.

Standard:

Terminals

Wiring Color

Condition

Specified Value

S25–29 (CANH) – S25–28 (CANL)

G – W

Ignition Switch OFF

54 to 69 

Ω

S25–29 (CANH) – S25–22 (GND)

G – W–B

Ignition Switch OFF

3 k

Ω

 or more

S25–28 (CANL) – S25–22 (GND)

W – W–B

Ignition Switch OFF

3 k

Ω

 or more

S25–29 (CANH) – S25–25 (BAT)

G – V

Ignition Switch OFF

1 M

Ω

 or more

S25–28 (CANL) – S25–25 (BAT)

W – V

Ignition Switch OFF

1 M

Ω

 or more

DIDI5–01

F19740

F19741

F19742

–

DIAGNOSTICS

CAN COMMUNICATION SYSTEM

DI–1073

1267

DIAGNOSIS SYSTEM

1.

BUS CHECK

HINT:
The ECUs that are properly connected to the CAN communica-
tion system can be displayed using the hand–held tester via
CAN VIM.
(a)

Select ”BUS CHECK” from the ”OBD/MOBD MENU”
screen.

(b)

Press ”ENTER” on the hand–held tester via CAN VIM.

(c)

The screen displays the ECUs and sensors that are prop-
erly connected to the CAN communication system.

HINT:
There is a communication stop in the system of any properly
connected ECUs or sensors that are not displayed 
(see page 

DI–1067

).

DIDI6–01

Action when unable to communicate

DTC detection
(Driver detectable)

Suspension 
Control ECU

VSC/TRC function stops

[When unable to communicate with ECM]
Function stops (Vehicle height cannot be changed until the ignition
switch is turned off)
[When unable to communicate with Translate ECU]
Vehicle height is maintained at the normal level until the ignition
switch is turned off. If communication is still impossible even after
the ignition switch is turned on again, the same height is maintained.

Not detectable
(

)

Not detectable
(VSC warning lamp 
comes on)

Detectable
(Only DTCs are stored)

ECM

Translate ECU

Suspension Control ECU

Rx

Tx

Tx

Rx

Tx

Tx

Tx

Rx

ECM

Translate ECU

DI–1074

–

DIAGNOSTICS

CAN COMMUNICATION SYSTEM

1268

FAIL–SAFE CHART

1.

FAIL–SAFE FUNCTION

(a)

When communication fails in any of the CAN bus lines (communication lines) due to a short circuit or
any other cause, the fail–safe function, which is specified for each system, operates to prevent the
system from malfunctioning.

(b)

Effects on each system when communication is impossible are as follows.

HINT:

Rx: Reception from each ECU.

Tx: Transmission to each ECU.