Lexus SC300 / Lexus SC400. Manual — part 239

OK

NG

10

Check main throttle position sensor (See page EG–609 or

EG–389

).

Adjust or replace main throttle position sensor (See
page

EG–333

or EG–205).

Check and replace ECM.

–

BRAKE SYSTEM

TRACTION CONTROL SYSTEM (TRAC)

BR–207

DTC

47, 48 Sub–Throttle Position Sensor Circuit

CIRCUIT DESCRIPTION

This sensor detects the opening angle of the sub–throttle valve and sends the appropriate signals to the ECU.
If a trouble signal is input, the ECU prohibits TRAC control.

DTC No.

DTC Detecting Condition

Trouble Area

47

When any of the following (1) through (3) is detected:

(1) Deviation of 5 steps or more to the closedside of

the idle step during sub–throttleinitial check.

(2) Voltage at terminal IDL2 switch is OFF evenafter

sub–throttle is driven to fully closedposition during

sub–throttle initial check 4.

(3) Voltage at terminal VSH is 1.45 V or morefor at

least 0.15 sec. while idle switch is ON.

Sub–throttle position sensor

Open or short in IDL2 circuit

ECM

TRAC ECU

48

Either of the following (1) or (2) continues for atleast

0.12 sec.

(1) Input voltage of TRAC ECU terminal VSH:4.3 V or

more.

(2) Input voltage of TRAC ECU terminal VSHis 0.2 V

or less while IDL2 switch OFF.

Sub–throttle position sensor

Open or short in VSH circuit

ECM

TRAC ECU

BR–208

–

BRAKE SYSTEM

TRACTION CONTROL SYSTEM (TRAC)

EG–608

or

EG–388

).

EG–333

or

EG–205

).

EG–333

or

EG–389

).

EG–481

).

DIAGNOSTIC CHART

DIAGNOSTIC CHART

–

BRAKE SYSTEM

TRACTION CONTROL SYSTEM (TRAC)

BR–209

WIRING DIAGRAM

BR–210

–

BRAKE SYSTEM

TRACTION CONTROL SYSTEM (TRAC)