Toyota Sequoia (2005). Manual - part 278

DIDM0–01

F16974

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–907

1101

TERMINALS OF ECU

1.

Skid Control ECU:

Symbols (Terminal No.)

Terminal Description

GND (1)

Skid control ECU ground

CANL (2)

Vehicle CAN communication line

VCP (3)

Pedal stroke sensor (Delta S Sensor) line

CANH (6)

Vehicle CAN communication line

E3 (8)

Pedal stroke sensor (Delta S Sensor) ground

VYS (11)

Yaw rate sensor power source

IG1 (13)

IG1 power supply

PIM (14)

Pedal stroke sensor (Delta S Sensor) line

D/G (15)

Diagnosis tester communication line

+BM (16)

Motor relay power supply

BST (17)

Brake booster line

PSNC (18)

Brake booster line

SS1 (19)

Yaw rate sensor signal line

STS (20)

Brake booster line

PSNO (21)

Brake booster line

BZ (22)

Buzzer output

SS2 (23)

Yaw rate sensor signal line

GYAW (24)

Yaw rate sensor ground

PMC2 (25)

M/C pressure sensor 2 signal

VCM2 (26)

M/C pressure sensor 2 power supply

E2 (27)

M/C pressure sensor 2 ground

PMC (28)

M/C pressure sensor 1 signal

E1 (29)

M/C pressure sensor 1 ground

VCM (30)

M/C pressure sensor 1 power supply

BSTP (31)

Brake booster line

GND2 (32)

Skid control ECU ground

FL+ (33)

FL wheel speed signal line

FL– (34)

FL wheel speed signal line

WA (35)

ABS warning light output

RR– (36)

RR wheel speed signal line

RR+ (37)

RR wheel speed signal line

BSW (38)

Brake inhibit signal line

STP (39)

Stop light switch signal input

F19198

Skid Control ECU
(harness side connector)

DI–908

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1102

Symbols (Terminal No.)

Terminal Description

TS (40)

Sensor check input

+BO (41)

Steering angle sensor line

RL+ (42)

RL wheel speed signal line

RL– (43)

RL wheel speed signal line

VSCW (44)

VSC OFF indicator output

FR– (45)

FR wheel speed signal line

FR+ (46)

FR wheel speed signal line

+BS (47)

Solenoid relay power supply

2.

Terminal Inspection

Disconnect the connector and measure the voltage on the wire harness side.
HINT:
Voltage can not be measured with the connector connected to the skid control ECU as the connector is water
resistance.

Symbols (Terminal No.)

Wiring Color

Terminal Description

Condition

Specified Condition

+BM (16) – GND1, 2 (1, 32)

B–R – W–B

Motor relay power supply

IG switch ON

10 to 14 V

GYAW (24) – GND1, 2 (1, 32)

G – W–B

Yaw rate sensor ground

Always

Below 1 

Ω

E3 (8) – GND1, 2 (1, 32)

L – W–B

M/C pressure sensor 3

ground

Always

Below  1 

Ω

E2 (27) – GND1, 2 (1, 32)

W – W–B

M/C pressure sensor 2

ground

Always

Below  1 

Ω

E1 (29) – GND1, 2 (1, 32)

W – W–B

M/C pressure sensor 1

ground

Always

Below  1 

Ω

STP (39) – GND1, 2 (1, 32)

G–Y – W–B

Stop light switch signal in-

put

Brake pedal depressed

8 to 14 V

STP (39) – GND1, 2 (1, 32)

G–Y – W–B

Stop light switch signal in-

put

Brake pedal released

Below  1.5 V

+BS (47) – GND1, 2 (1, 32)

B–R – W–B

Solenoid relay power sup-

ply

IG switch ON

10 to 14 V

F16975

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–909

1103

Translate ECU:

Symbols (Terminal No.)

Wiring Color

Terminal Description

Condition

Specified Condition

IG1 (1) – GND (40)

B–R – O

Translate ECU power

supply

IG SW ON

10 to 14 V

PKB2 (4) –  GND (40)

LG–R – O

PKB signal line

IG SW ON, PKB SW ON

Below 2.0 V

PKB2 (4) –  GND (40)

LG–R – O

PKB signal line

IG SW ON, PKB SW OFF

10 to 14 V

VSC+ (7) – VSC– (11)

L – W

CAN communication line

IG switch ON

Pulse generation

ENG+ (14) – ENG– (16)

R – W

ECM communication

IG SW ON

Pulse generation

SS1+ (18) – SS1– (19)

O – Y

Steering angle sensor line

IG SW ON

Pulse generation

TRIG (20) – GND (40)

W–L – O

Steering angle sensor sig-

nal

IG SW ON

4.5 to 5.5 V

LVL2 (24) – GND (40)

Y–L – O

Brake fluid level signal

Brake fluid level SW ON

Below 1.5 V

CSW (26)* – GND (40)

L–W – O

Center diff. lock SW sig-

nal

IG SW ON, VSC OFF SW ON

Below 1.5 V

CSW (26)* – GND (40)

L–W – O

Center diff. lock SW sig-

nal

IG SW ON, VSC OFF SW OFF

8 to 14 V

TS (27) – GND (40)

R–L – O

Sensor check input

IG switch ON

10 to 14 V

TC (28) – GND (40)

P–B – O

Diagnosis tester commu-

nication line

IG switch ON

10 to 14 V

CD (29)* – GND (40)

BR–Y – O

Center diff. lock lamp sig-

nal

IG SW ON, center diff. lock indica-

tor ON

Below 1.5 V

CD (29)* – GND (40)

BR–Y – O

Center diff. lock lamp sig-

nal

IG SW ON, center diff. lock indica-

tor OFF

8 to 14 V

EXI2 (31)* – GND (40)

Y–G – O

Center diff. lock signal

IG SW ON, center diff. lock SW ON

Below 1.5 V

EXI2 (31)* – GND (40)

Y–G – O

Center diff. lock signal

IG SW ON, center diff. lock SW

OFF

8 to 14 V

IND (37) – GND (40)

W–R – O

SLIP indicator signal

IG SW ON, SLIP indicator ON

Below 2.0 V

IND (37) – GND (40)

W–R – O

SLIP indicator signal

IG SW ON, SLIP indicator OFF

10 to 14 V

WT (38) – GND (40)

R–G – O

VSC OFF or TRAC OFF

warning light circuit

IG SW ON, VSC OFF or TRAC

OFF warning light ON

Below 2.0 V

WT (38) – GND (40)

R–G – O

VSC OFF or TRAC OFF

warning light circuit

IG SW ON, VSC OFF or TRAC

OFF warning light OFF

10 to 14 V

BRL (39) – GND (40)

R–B – O

BRAKE warning light cir-

cuit

IG SW ON, BRAKE warning light

ON

Below 2.0 V

BRL (39) – GND (40)

R–B – O

BRAKE warning light cir-

cuit

IG SW ON, BRAKE warning light

OFF

10 to 14 V

*: Only for 4WD

DIDM1–01

F13444

USA:

CANADA:

USA:

CANADA:

2WD:

4WD:

DI–910

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1104

DIAGNOSIS SYSTEM

1.

CHECK WARNING LIGHT

(a)

Release the parking brake pedal.

(b)

When the ignition switch is turned ON, check that the ABS
warning light, VSC TRAC warning light, VSC OFF (TRAC
OFF) indicator light, BRAKE warning light and SLIP indi-
cator light come on for approx. 3 seconds.

HINT:

When the parking brake is applied or the level of the brake
fluid is low, the BRAKE warning light comes on.

If the indicator check result is not normal, proceed to trou-
bleshooting for the ABS warning light circuit, VSC TRAC
warning light circuit, VSC OFF (TRAC OFF) indicator light
circuit, BRAKE warning light circuit or SLIP indicator light
circuit.

Trouble Area

See page

ABS warning light circuit

DI–1021

 or 

DI–1025

VSC TRAC warning light circuit

DI–1027

 or 

DI–1031

VSC OFF (TRAC OFF) indicator light circuit

DI–1048

BRAKE warning light circuit

DI–1033

 or 

DI–1038

SLIP indicator light circuit

DI–1041

 or 

DI–1045

The DTCs are simultaneously stored in the memory. The
DTCs can be read by connecting the SST between TC
and CG terminals of the DLC3 and observing the blinking
of the ABS and VSC warning lights, or by connecting a
hand–held tester.

This system has a sensor signal check function (TEST
MODE) (See page 

DI–899

).

The DTC can be read by connecting the SST between ter-
minals TS and CG of the DLC3 and observing the blinking
of the ABS and VSC TRAC warning lights, or by connect-
ing a hand–held tester.