1991 LEXUS SC400 Service Repair Manual

fuel reserve door lock hood open battery replacement check engine rear view mirror

Load previous 8 pages

Page 1121 of 4087

LEXUS SC400 1991 Service Repair Manual
Check for Fluid Leakage.
BR±152±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
WhereEverybodyKnowsYourName

Page 1122 of 4087

LEXUS SC400 1991 Service Repair Manual
TRACTION CONTROL SYSTEM (TRAC)
DESCRIPTION
BR0F3±01
The TRAC (Traction Control) system totally controls the engine torque and the braking of the driving wheels
(rear wheels). It helps avoid slippage

Page 1123 of 4087

LEXUS SC400 1991 Service Repair Manual
HYDRAULIC SYSTEM DIAGRAM
BR0F5±01
BR±154±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
WhereEverybodyKnowsYourName

Page 1124 of 4087

LEXUS SC400 1991 Service Repair Manual
WIRING DIAGRAM
BR0F6±01
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±155
WhereEverybodyKnowsYourName

Page 1125 of 4087

LEXUS SC400 1991 Service Repair Manual
ECU TERMINALS
ABS & TRAC ECU:
BR0F7±05
BR±156±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
WhereEverybodyKnowsYourName

Page 1126 of 4087

LEXUS SC400 1991 Service Repair Manual
TRAC ECU:
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±157
WhereEverybodyKnowsYourName

Page 1127 of 4087

$LEXUS SC400 1991 Service Repair Manual ECU TERMINALS STANDARD VALUE ABS & TRAC ECU: BR0F8±03 Symbols (Terminals No.) STD Voltage (V)\ \ Condition $

ECU TERMINALS STANDARD VALUE
ABS & TRAC ECU:
BR0F8±03
Symbols
(Terminals No.) STD Voltage (V)\
\
Condition

BAT
(A25±21)

±

GND
(A25±22)

10±14
\

\

\
Always

IG
(A24±24)

±

GND
(A25±22)

10±14
\

\

\
IG switch ON

SR
(A24±22)

±

R±
(A24±25)

8.3±14
\

\

\
IG switch ON, ABS warning light OFF

MR
(A25±16)

±

R±
(A24±25)

Below 1.0\

\

\
IG switch ON

TSR
(A24±1)

±

R±
(A24±25)

8.3±14\

\

\
IG switch ON, TRAC indicator light OFF

TMR
(A24±9)

±

R±
(A24±25)

Below 1.0\

\

\

IG switch ON
SFR
(A25±1) ± GND
(A25±2) 10±14\
\
IG switch ON, ABS warning light OFF

SFL
(A24±13)

±

GND
(A25±22)

10±14
\

\

\
IG switch ON, ABS warning light OFF

SRR
(A24±26)

±

GND
(A25±22)

10±14
\

\

\
IG switch ON, ABS warning light OFF

SRL
(A25±12)

±

GND
(A25±13)

10±14
\

\

\
IG switch ON, ABS warning light OFF

AST
(A24±8)

±

GND
(A25±22)

10±14\

\

\
IG switch ON, ABS warning light OFF

SAC
(A24±12)

±

GND
(A25±22)

10±14\

\

\

IG switch ON, TRAC indicator light OFF
SMC
(A24±2) ± GND
(A25±22) 10±14\
\
IG switch ON, TRAC indicator light OFF

SRC
(A24±15)

±

GND
(A25±22

10±14
\

\

\
IG switch ON, TRAC indicator light OFF

PR
(A24±10)

±

E2
(A24±20)

5±7
\

\

\
IG switch ON

VC
(A24±19)

±

E2
(A24±20)

4±6
\

\

\
IG switch ON
ALT
±
GND Below 1.0\
\
IG switch ON
ALT
(A25±8) ± GND
(A25±22) 10±14\
\
Idling

WA

±

GND
Below 2.0\
\
IG switch ON, ABS warning light ON WA
(A25±9) ± GND
(A25±22) 10±14\
\
IG switch ON, ABS warning light OFF

PKB

±

GND

Below 1.5
\

\

\
IG switch ON, PKB switch ON,
Fluid in M/C reservoir above MIN level

PKB
(A25±17)

±

GND
(A25±22)

10±14
\

\

\
IG switch ON, PKB switch OFF,
Fluid in M/C reservoir above MIN level
BR±158±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
WhereEverybodyKnowsYourName

Page 1128 of 4087

$LEXUS SC400 1991 Service Repair Manual Symbols (Terminals No.) STD Voltage (V)\ \ \ Condition LBL (A25�$

Symbols
(Terminals No.)

STD Voltage (V)\

\

\

Condition
LBL
(A25±6) ± GND
(A25±22) 10±14\
\
IG switch ON
Fluid in M/C reservoir tank above MIN level.

STP

±

GND

Below 1.5\

\

\
Stop light switch OFF

STP
(A25±10)
±

GND
(A25±22)

8±14
\

\

\
Stop light switch ON
D/G
(A25±20) ± GND
(A25±22) 10±14\
\
IG switch ON, ABS warning light OFF

Tc
(A26±3)

±

GND
(A25±22)

10±14
\

\

\
IG switch ON

Ts
(A26±1)

±

GND
(A25±22)

10±14
\

\

\
IG switch ON
P
±
GND 10±14\
\
IG switch ON, Shift position in ªPº position P
(A26±10) ± GND
(A25±22) Below 1.5\
\
IG switch ON, Other shift position in ªPº position

N

±

GND

10±14\

\

\
IG switch ON, Shift position in ªNº position

N
(A26±5)
±

GND
(A25±22) Below 1.5\
\
IG switch ON, Other shift position in ªNº position

FR+
(A24±17) ±

FR±
(A24±4)

AC generation\

\

IG switch ON
Slowly turn right front wheel.

FL+
(A24±5)

±

FL±
(A24±18)

AC generation
\

\

\
IG switch ON
Slowly turn left front wheel.

RR+
(A25±14)

±

RR±
(A25±3)

AC generation
\

\

\
IG switch ON
Slowly turn right rear wheel.

RL+
(A25±4)

±

RL±
(A25±15)

AC generation
\

\

\
IG switch ON
Slowly turn left rear wheel.

FRO
(A26±15)
±

GND
(A25±22)

Pulse generation\

\

\

IG switch ON
Slowly turn right front wheel.

FLO
(A26±6)
±

GND
(A25±22)

Pulse generation\

\

\

IG switch ON
Slowly turn left front wheel.

RRO
(A26±13)
±

GND
(A25±22)

Pulse generation\

\

\

IG switch ON
Slowly turn right rear wheel.
RLO
(A26±4) ± GND
(A25±22) Pulse generation\
\
IG switch ON
Slowly turn left rear wheel.
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±159
WhereEverybodyKnowsYourName

Load next 8 pages

Page: < prev 1-10 ... 1089-1096 1097-1104 1105-1112 1113-1120 1121-1128 1129-1136 1137-1144 1145-1152 1153-1160 ... 4088 next >

headlamp torque spare tire wiper size brake pads brake light