1991 LEXUS SC400 Service Repair Manual

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Page 1129 of 4087

$LEXUS SC400 1991 Service Repair Manual TRAC ECU: Symbols (Terminals No.) STD Voltage (V) \ \ \ Condition $

TRAC ECU:

Symbols
(Terminals No.)

STD Voltage (V)
\

\

\
Condition

BAT
(T13±8)

±

GND
(T14±14)

10±14
\

\

\
Always

BM
(T14±15)
±

GND
(T14±14)

10±14\

\

\
Always

IG
(T14±2)
±

GND
(T14±14)

10±14\

\

\
IG switch ON

ACM
(T14±13)
±

GND
(T14±14)

4±5\

\

\

IG switch ON
Sub throttle valve fully open
A
(T14±11) ± GND
(T14±14) 4±5\
\
IG switch ON
Sub throttle valve fully open

A
(T14±12)

±

GND
(T14±14)

4±5
\

\

\
IG switch ON
Sub throttle valve fully open

BCM
(T14±26)

±

GND
(T14±14)

4±5
\

\

\
IG switch ON
Sub throttle valve fully open

B
(T14±24)

±

GND
(T14±14)

4±5
\

\

\

IG switch ON
Sub throttle valve fully open

B
(T14±25)
±

GND
(T14±14)

4±5\

\

\

IG switch ON
Sub throttle valve fully open
TR5 ± E1 Below 1.0\
\
IG switch ON, Engine stopped

TR5
(T14±16) ±
E1
(T14±20) 10±14\
\
Engine idling
IDL1
±
E1 Below 1.0\
\
Engine idling, Main throttle valve fully closed
IDL1
(T14±10) ± E1
(T14±20) 10±14\
\
Engine idling, Main throttle valve fully open
IDL2

±

E1
Below 1.0\
\
IG switch ON, Sub±throttle valve fully closed

IDL2
(T14±22)
±

E1
(T14±20)

10±14\

\

\
IG switch ON, Sub±throttle valve fully open
VTH ± E1 Below 1.5\
\
IG switch ON, Main throttle valve fully closed

VTH
(T14±8)
±

E1
(T14±20) 3.0±5.5\
\
IG switch ON, Main throttle valve fully open
VSH ± E1 Below 1.5\
\
IG switch ON, Sub±throttle valve fully closed

VSH
(T14±19) ±
E1
(T14±20) 3.0±5.5\
\
IG switch ON, Sub±throttle valve fully open

TR2
(T14±21)
±

E1
(T14±20)

10±14\

\

\
IG switch ON

NEO
(T14±6)
±

E1
(T14±20)

Pulse generation\

\

\
Engine idling
CSW ± GND Below 1.5\
\
IG switch ON, TRAC cut switch pushed in

CSW
(T13±13) ±
GND
(T14±14) 10±14\
\
IG switch ON, TRAC cut switch released

Below 1 5
\
\
IG switch ON, PKB switch ON,
PKB
±
GND
(T14±14)
Below 1.5\
\
Fluid in M/C reservoir above MIN level
PKB
(T14±1) ± (T14±14)
10±14
\
\
IG switch ON, PKB switch OFF, 10±14\
\
Fluid M/C reservoir above MIN level
BR±160±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
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Page 1130 of 4087

$LEXUS SC400 1991 Service Repair Manual Symbols (Terminals No.) STD Voltage (V)\ \ \ Condition IND (T13�$

Symbols
(Terminals No.)

STD Voltage (V)\

\

\

Condition
IND
(T13±11) ± GND
(T14±14) 10±14\
\
IG switch ON, TRAC indicator light OFF

WT

±

GND

Below 2.0\

\

\
IG switch ON, TRAC OFF indicator light ON

WT
(T13±14)
±

GND
(T14±14)

10±14
\

\

\
IG switch ON, TRAC OFF indicator light OFF
STP ± GND Below 1.5\
\
Stop light switch OFF

STP
(T13±2) ±
GND
(T14±14) 8±14\
\
Stop light switch ON
P
±
GND 10±14\
\
IG switch ON, Shift position in ªPº position

P
(T13±7) ±
GND
(T14±14) 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
(T13±16) ± GND
(T14±14) Below 1.5\
\
IG switch ON, Other shift position in ªNº position

Tc
(T13±6)

±

GND
(T14±14)

10±14
\

\

\
IG switch ON

FRO
(T13±10)

±

GND
(T14±14)

Pulse generation
\

\

\
IG switch ON
Slowly turn right front wheel

FLO
(T13±3)
±

GND
(T14±14)

Pulse generation\

\

\

IG switch ON
Slowly turn left front wheel

RRO
(T13±12)
±

GND
(T14±14)

Pulse generation\

\

\

IG switch ON
Slowly turn right rear wheel

RLO
(T13±5)
±

GND
(T14±14)

Pulse generation\

\

\

IG switch ON
Slowly turn left rear wheel
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±161
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Page 1131 of 4087

LEXUS SC400 1991 Service Repair Manual
SERVICE SPECIFICATIONS
SERVICE DATA
BatterySpecific gravity1.27±1.29
(when fully charged at 205C (68 5F))
AlternatorRated output12 V±100 A
Rotor coil resistance2.8±3.0
Slip ring diameterSTD 14.

Page 1132 of 4087

LEXUS SC400 1991 Service Repair Manual
CHARGING SYSTEM
CHARGING SYSTEM
CH±1
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Page 1133 of 4087

$LEXUS SC400 1991 Service Repair Manual DESCRIPTION The alternator is a small, high±rpm, high±performance type with an IC\ regulator incorporated. The IC regula- tor uses integrated circuits and controls the voltage produced by the alte$

Page 1134 of 4087

$LEXUS SC400 1991 Service Repair Manual DESCRIPTION The alternator is a small, high±rpm, high±performance type with an\ IC regulator incorporated. The IC regula- tor uses integrated circuits and controls the voltage produced by the alte$

Page 1135 of 4087

$LEXUS SC400 1991 Service Repair Manual SYSTEM CIRCUIT OPERATION When the ignition switch is turned ON, current from the battery flows from t\ erminal L of the alternator through the IC regulator to terminal E, causing the discharge warnin$

Page 1136 of 4087

LEXUS SC400 1991 Service Repair Manual
PREPARATION
SST (SPECIAL SERVICE TOOLS)
09285±76010
Injection Pump
Camshaft Bearing
Cone ReplacerRotor rear bearing
09286±46011Injection Pump
Spline Shaft PullerRectifier end frame
09608±20012
Fro

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