2003 LEXUS LS430 sensor

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Page 252 of 4500

LEXUS LS430 2003  Factory Repair Manual AIR CONDITIONER TEST RESULT
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )  
A  
2.INSPECT COOLER (ROOM TEMPERATURE SENS

Page 253 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 37: Identifying Terminals Of A14 A/C Room Temperature Sensor Connector 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
HINT: 
As the temperature increases, the resistance decreases (see the 
graph

Page 254 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 38: Resistance/Temperature Graph 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: REPLACE COOLER (ROOM TEMPERATURE SENSOR) THERMISTOR  
OK: Go to next step  
3.INSPECT AIR CONDITIONING AMPLIFIE

Page 255 of 4500

LEXUS LS430 2003  Factory Repair Manual B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )  
Fig. 39: Inspecting Air Conditioning Amplifier (TR 
- SG-2) 
Courtesy o

Page 258 of 4500

LEXUS LS430 2003  Factory Repair Manual Temperature Sensor)Thermistor) 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
 )  
CIRCUIT DESCRIPTION 
The sensor connected to the ECM detects

Page 259 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 42: Ambient Temperature Sensor Circuit 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
INSPECTION PROCEDURE 
1.READ VALUE ON HAND-HELD TESTER 
a. Connect the hand-held tester to the DLC3.  
b. Tur

Page 261 of 4500

LEXUS LS430 2003  Factory Repair Manual ECM (TAM - E2) TEST RESULT 
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE ECM (SEE REPLACEMENT )  
A: Go to next step  
3.INSPECT A/C AMBIENT TEMPERATURE SENSOR 
a.

Page 262 of 4500

LEXUS LS430 2003  Factory Repair Manual Standard:  
A/C AMBIENT TEMPERATURE SENSOR RESISTANCE 
HINT: 
As the temperature increases, the resistance decreases (see the graph below). 
Fig. 45: Resistance/Temperature Graph
Tester connectionCond