1991 LEXUS SC300 code 32

OKNG
OKNG
INSPECTION PROCEDURE
1Check output condition of diag. code 51.
C
OK
Hint
PSetting the test mode.
(2) Turn ignition switch OFF.
(2) Connect terminals TE2 and E1 and TDCL.
(2) Turn ignition switch ON.(For checking terminal A/C, start the engine.)
(2) Connect terminals TE1 and E1 of TDCL.
Check if code ª51º is output by the ªCHECKº engine
warning light.
*: Before the STA signal is input (ST is not ON), diagnostic code 43 is also output.
Diag. code 42 is output with vehicle speed 5 km/h (3
mph) or below
IDL1 .... Go to step 2 NSW ... Go to page TR±22.
A/C ..... Go to step 3
Proceed to next circuit inspection shown on
maxtrix chart (See page TR±35).
2Check throttle position sensor.
C
OK
PDisconnect throttle position sensor connector.
Measure resistance between terminals IDL1 and E2 of
throttle position sensor connector.
Adjust or replace throttle position sensor
See page FI±73).
Check and repair harness or connector between
engine & ECT ECU and throttle position sensor.
TR±120±
ENGINE TROUBLESHOOTING Circuit Inspection
WhereEverybodyKnowsYourName

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 body ground via the starter relay and theft deterrent ECU\
, thus the terminal
NSW voltage becomes 0V. When the shift lever is in the D, 2, L or R position, the neutral start\
switch goes off,
so the voltage of ECU terminal NSW becomes battery voltage, the voltage of the ECU internal power source.
If the shift lever is moved from the N range to the D range, this signal\
is used for air±fuel ratio correction and
for idle speed control (estimated control), etc.
When the neutral start switch is off, code º51º is output in the test mode diagnosis. (This is not a\
bnormal.)
DIAGNOSTIC CHARTDIAGNOSTIC CHART
HINT: This diagnosis chart is based on premise that the engine is cranked norm\
ally. If the engine is notcranked, proceed to the matrix chart of problem symptoms on page TR±35.
Check output condition of diag. code 51.
Proceed to next circuit inspection shown
on matrix chart (See page TR±35).
Check for open in harness and connector
between neutral start switch and ECU.
Repair or replace harness or connector.
Check and replace ECU.
Check and replace ECU.
Replace neutral start switch.Check neutral start switch (See page
AT±100 ).
TR±122
±
ENGINE TROUBLESHOOTING Circuit Inspection
WhereEverybodyKnowsYourName

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) Connect terminal TE1 and E1 of TDCL.
Check if diagnostic code ª51º is output when then shift
level is in the P and D shift positions.
Result:
Go to step 2.
Go to step 3.
Proceed to next circuit inspection shown on ma-
trix chart (See page TR±35).
2
Check for open in harness and connector between engine & ECT ECU and neutral \
start switch
(See page IN±27).
Check and replace engine & ECT ECU.
Repair or replace harness or connector.
3Check neutral start switch (See page AT±100).
Replace neutral start switch.
Check and replace engine & ECT ECU.
±
ENGINE TROUBLESHOOTING Circuit InspectionTR±123
WhereEverybodyKnowsYourName

1992 - 1995 SC 300/400 A/C CONTROL ASSEMBLY SERVICE PARTSPage 6 of 6
MODEL
YEAR
Control Panel
Control Switch
Bulb
PART NUMBER INFORMATION:
PART NAME PART NUMBER MODEL APPLICATION QTY 55902-24010 `92-`94 SC 300/SC 400 1
55902-24020 `95 SC 300/SC 400 1
88601-24020 `92-`94 SC 300/SC 400 1
88601-24030 `95 SC 300/SC 400 1
84999-60360 `92-`94 SC 300/SC 400 3
84999-60340 `95 SC 300/SC 400 3
88650-24150 `92 SC 300 1
88650-24160 `92 SC 400 1
Amplifier with Case 88650-24190 `93-`94 SC 300 1
88650-24200 `93-`94 SC 400 1
88650-24231 `95 SC 300/SC 400 1
Wire Harness 88484-24010 `92-`95 SC 300/SC 400 1
Screws 90094-90416 `92-`95 SC 300/SC 400 *
* Screw Replacement not required for repair
WARRANTY INFORMATION
:
OPCODE DESCRIPTION TIME* OPN T1 T2
883851 A/C Control Assy, R&R 0.6 55900-XXXXX ** **
Combo ªAº Control Panel R&R 0.2 22902-XXXXX ** **
Combo ªCº Bulbs R&R 0.2 84999-XXXXX ** **
Combo ªDº Amplifier with Case R&R 0.2 88650-XXXXX ** ** Combo ªEº Wire Harness R&R 0.2 88484-XXXXX ** **
Combo ªGº Control Switch R&R 0.2 88601-XXXXX ** **
* Listed time for sub±operations are to be added to base operation to R\
&R the A/C control Assembly and include all necessary checks and tests.
** As applicable per the Lexus Universal Flat Rate Manual.
WhereEverybodyKnowsYourName

TSIB
IntroductionA musty odor may be emitted from the air conditioning system of some vehicles which are
usually operated in areas with high temperature and humidity. It is most noticeable when
the air conditioner is first turned ªONº after the vehicle has bee\
n parked for several hours.
The odor could result from one or more of the following conditions:
1. Blockage of the evaporator housing drain pipe, resulting in the build up of cond\
ensation.
2. Microbial growth in the evaporator, arising from dampness in the evaporator housing
where the cooling air flow is dehumidified.
To address excessive air conditioning evaporator odor, check the evaporator housing drain
pipe for blockage. If no problems are found, the evaporator and housing\
should be cleaned
and disinfected using the general procedure given on page 2, and the model \
specific
procedure on the pages indicated in the Table of Contents at the bottom of this page.
Affected While this procedure may be used on any Lexus vehicle, this bulletin giv\
es details
Vehicles specifically for the '92±'96 ES 300, all GS 300, '93±'94 LS 400, all SC 300/400 and the\
LX 450.
Tools &
PART NUMBER DESCRIPTION OF TOOLS & MATERIALS QUANTITY SOURCE
Materials08821±00810±01 Spray Gun Kit 1 OTC 08821±00811±01 Spray Gun (replacement) (1) OTC
08821±00812±01 Spray Gun Nozzle (replacement) (1) OTC
08821±00813±01 Freshener Mixing Container (replacement) (1) OTC
08821±00801±DS Air Conditioning Freshener 1 per vehicle TMS
CAUTION:
Wear safety glasses, protective mask, and gloves while working with the
freshener.
Warranty
OPCODE DESCRIPTION TIME OPN T1 T2
Information
N/A No applicable warranty information ± ± ± ±
Table ofMODEL PAGE MODEL PAGE MODEL PAGE MODEL PAGE
Contents
ES 300 3 GS 300 5 LS 400 7
GENERAL 2
SC 300 9 SC 400 9 LX 450 11
General Procedure applies to all models and model years.
The Specific Model Sections cover only the listed ªaffected models.º
HEATING & AIR CONDITIONING
September 12, 1997
Title:
AIR CONDITIONING EVAPORATOR ODOR
Models:
'92±96 ES 300, '93±'94 LS 400,
All GS 300, SC 300/400, LX 450.
Page 1 of 11
AC001±97
WhereEverybodyKnowsYourName

Lexus Supports ASE CertificationPage 1 of 12
Title:
SENSOR INSPECTION FOR AIR
CONDITIONING SYSTEM
Models:
'90 ± Current All Models
Technical Service
Information Bulletin
December 16, 2004
AC005-04
This service bulletin contains inspection procedures to more precisely confi\
rm proper
operation of the following temperature sensors of the air conditioning s\
ystem. Follow the
procedures in this service bulletin when inspecting these sensors. These\
contents will be
reflected in future repair manuals.
Room Temperature Sensor
Ambient Temperature Sensor
Air Duct Sensor
Evaporator Temperature Sensor
Solar Sensor
Room Humidity Sensor
All 1990 ± Current model year Lexus vehicles.
OP CODEDESCRIPTIONTIMEOFPT1T2
N/ANot Applicable to Warranty±±±±
HEATING & AIR CONDITIONING
Introduction
Applicable Vehicles
Warranty
Information
WhereEverybodyKnowsYourName

REAR SUSPENSION NOISEPage 2 of 2
WARRANTY INFORMATION:
OPCODE DESCRIPTION TIME OPN T1 T2
R&R Rear Shock AbsorberAssembly
(both sides including 48341-24040 or
replacement of spring 48341-24070
bumpers and all necessary
adjustments)
Replacement of the rear spring bumper under warranty is limited to correction of a prob\
lem based upon a
customer 's complaint.
482201A 1.8 91 41
WhereEverybodyKnowsYourName

Lexus Supports ASE CertificationPage 1 of 5
Title:
SUSPENSION BALL JOINT INSPECTION
Models:
Applicable Models
Technical Service
Information Bulletin
October 11, 2002
PG012-02
This Service Bulletin is to inform you of the inspection method, and free pl\
ay
specification figures for suspension ball joints. The on±vehicle insp\
ection methods
have been standardized.
1990 ± 2000 model year LS 400 vehicles.
2001 ± 2003 model year LS 430 vehicles.
1993 ± 2003 model year GS 300 vehicles.
1998 ± 2000 model year GS 400 vehicles.
2001 ± 2003 model year GS 430 vehicles.
1992 ± 2000 model year SC 300 & SC 400 vehicles.
2002 ± 2003 model year SC 430 vehicles.
2001 ± 2003 model year IS 300 vehicles.
1999 ± 2003 model year RX 300 vehicles.
1990 ± 2003 model year ES 250 & ES 300 vehicles.
1998 ± 2003 model year LX 470 vehicles.
OP CODEDESCRIPTIONTIMEOFPT1T2
N/ANot Applicable to Warranty±±±±
PRODUCT GENERAL INFORMATION
Introduction
Applicable Vehicles
Warranty
Information
WhereEverybodyKnowsYourName