LEXUS SC400 1991 Service Repair Manual

LEXUS SC400 1991 Service Repair Manual SC400 1991 LEXUS LEXUS https://www.carmanualsonline.info/img/36/57051/w960_57051-0.png LEXUS SC400 1991 Service Repair Manual
Trending: open hood, audio, low beam, power steering fluid, high beam, height adjustment, CD changer

Page 3761 of 4087

LEXUS SC400 1991  Service Repair Manual 
Check voltage of ECU power source.
Check continuity between terminals E1 and
body ground.
Check voltage of terminal IGSW.
Check IGN fuse.
Check ignition switch.
Check for open in harness and connecto

Page 3762 of 4087

LEXUS SC400 1991  Service Repair Manual 
NGOK
OKNG
NGOK
INSPECTION PROCEDURE
1Check voltage between terminals +B, +B1 and E1 of engine (& ECT) ECU connec\
tor.
C
OK
P1. Connect  the Check Harness A. (See page TR±34)
2. Turn ignition switch

Page 3763 of 4087

LEXUS SC400 1991  Service Repair Manual 
OKNG
OKNG
4Check IGN fuse.
C
OK
PRemove IGN fuse from J/B No. 1.
Check continuity of IGN fuse.
Continuity
Check for short in all the harness and components con-
nected to IGN fuse (See attached wirin

Page 3764 of 4087

LEXUS SC400 1991  Service Repair Manual 
OKNG
OKNG
6Check voltage between terminal M±REL of engine (& ECT) ECU connector and\
 body ground.
C
OK
PTurn ignition switch on.
Measure voltage between terminal M±REL of engine
(& ECT) ECU connec

Page 3765 of 4087

LEXUS SC400 1991  Service Repair Manual 
OKNG
OKNG
8Check EFI main relay.
C
OK
P
OK
C
Remove EFI main relay.
Check continuity between terminals of EFI main relay
shown below.
1. Apply battery positive voltage between terminals 1and 3.
2. Ch

Page 3766 of 4087

LEXUS SC400 1991  Service Repair Manual 
Neutral Start Switch Circuit
CIRCUIT DESCRIPTION
The neutral start switch goes on when the shift lever is in the N or P shif\
t position. When it goes on the terminal
NSW of the ECU is grounded to bo

Page 3767 of 4087

LEXUS SC400 1991  Service Repair Manual 
OK
NG
Type I
NG
Type II
NG
OK
OKNG
INSPECTION PROCEDURE
1Check output condition of diag. code 51.
C
P(2) Connect terminals TE2 and E1 of TDCL.
(2) Turn ignition switch on.
(2) Crank the engine.
(2) C

Page 3768 of 4087

LEXUS SC400 1991  Service Repair Manual 
VALVE CLEARANCE ADJUSTING TOOL SETPage 1 of 1
The Valve Lifter Press has undergone two modifications that will improve service procedures
on UZ and VZ series engines.
1. Due to space limitations on t

Page 3769 of 4087

LEXUS SC400 1991  Service Repair Manual 
A/C COMPRESSOR OIL APPLICATIONSPage 1 of 1
Care must be taken to use  only refrigerant oil which is compatible to the vehicles system.
Following are A/C oil application charts for both R±12 and HFC

Page 3770 of 4087

LEXUS SC400 1991  Service Repair Manual 
DATE:JULY 19, 1996
Title1992 - 1995 SC 300/400 A/C CONTROL ASSEMBLY SERVICE PARTSPage 1 of 6
To allow repairs to the A/C Control Assembly, service parts are now available.  The following 
information
Trending: oil level, fuses, display, ignition, Key buzzer, fuse diagram, remote start