1991 LEXUS SC400 Service Repair Manual

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Page 345 of 4087

LEXUS SC400 1991 Service Repair Manual
OKNG
OKNG
OKNG
INSPECTION PROCEDURE
1Check voltage between terminal KD of ECM connector and body ground.
C
OK
P1. Connect the check harness A to the ECM (See EGsection).
2. Turn ignition switch ON (

Page 346 of 4087

LEXUS SC400 1991 Service Repair Manual
The park/neutral position switch detects the shift lever
position and sends signals to ECM.The ECM receives
signals (R, PNP, 2 and L) from the park/neutral position
switch. When the signal is not sen

Page 347 of 4087

LEXUS SC400 1991 Service Repair Manual
OKNG
OKNG
OKNG
INSPECTION PROCEDURE
1Check voltage between terminal R, PNP, 2, L of ECM connector and body ground.
C
OK
P1. Connect the check harness A to the ECM (See EGsection).
2. Turn ignition s

Page 348 of 4087

$LEXUS SC400 1991 Service Repair Manual AT±66BE IN±33 WIRING DIAGRAM Stop Light Switch Circuit CIRCUIT DESCRIPTION The purpose of this circuit is to prevent the engine from stalling, while d\ riving in lockup condition, when brakes are s$

Page 349 of 4087

LEXUS SC400 1991 Service Repair Manual
OKNG
OKNG
OKNG
INSPECTION PROCEDURE
1Check operation of stop light.
Check if the stop lights go on and off normally when the brake pedal is operated and released.C
Check and repair stop light circuit

Page 350 of 4087

$LEXUS SC400 1991 Service Repair Manual AT±66 IN±33 WIRING DIAGRAM Pattern Select Switch Circuit CIRCUIT DESCRIPTION The ECM memory contains the shift programs for the NORMAL and POWER pattern\ s, 2 position and L position and the lock�$

Page 351 of 4087

LEXUS SC400 1991 Service Repair Manual
OKNG
OKNG
OKNG
INSPECTION PROCEDURE
1Check voltage between terminal P of ECM connector and body ground.
C
OK
Hint
P1. Connect the check harness A to the ECM (See EGsection).
2. Turn ignition switch

Page 352 of 4087

LEXUS SC400 1991 Service Repair Manual
WIRING DIAGRAM
O/D Main Switch and O/D OFF Indicator Light Circuit
CIRCUIT DESCRIPTION
The O/D main switch contacts go off when the switch is pushed in and comes on when it is pushed out.
In O/D main

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