Lexus ES300 (2002 year). Manual — part 324
I30099
Heater Control Housing Sub-assy
(A/C Amplifier)
A1
A/C Ambient
Temp. Sensor
TAM
8
1
2
IF7
B-W
G-R
A15
IF7
4
5
SG-6
39
A15
G-R
B-W
-
DIAGNOSTICS
AIR CONDITIONING SYSTEM
05-473
626
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
12
AMBIENT TEMPERATURE SENSOR CIRCUIT
CIRCUIT DESCRIPTION
This sensor detects the temperature outside the cabin and sends the appropriate signals to the A/C amplifier.
DTC No.
Detection item
Trouble Area
12
Open or short in ambient temperature sensor circuit
Ambient temperature sensor
Harness or connector between ambient temperature sensor
and A/C amplifier
A/C amplifier
WIRING DIAGRAM
056CM-01
I30155
I30156
Resistance (k
Ω
)
Temperature (
C)
05-474
-
DIAGNOSTICS
AIR CONDITIONING SYSTEM
627
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
INSPECT COOLER (AMBIENT TEMP. SENSOR) THERMISTOR
(a)
Remove cooler (ambient temp. sensor) thermistor.
(b)
Measure resistance between terminals 1 and 2 of cooler
(ambient temp. sensor) thermistor connector at each tem-
perature.
Resistance:
at 25
C (77
F) : 1.65 - 1.75 k
Ω
at 40
C (104
F) : 0.85 - 0.95 k
Ω
HINT:
As the temperature increases, the resistance decreases.
NG
REPLACE COOLER (AMBIENT TEMP. SENSOR)
THERMISTOR
OK
2
CHECK HARNESS AND CONNECTOR(COOLER(AMBIENT
TEMP.SENSOR)THERMISTOR AND CLOCK ASSY)
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE HEATER CONTROL HOUSING SUB-ASSY
0527H-03
05-384
-
DIAGNOSTICS
ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
537
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE[ECT]
HOW TO PROCEED WITH TROUBLESHOOTING
1
Vehicle Brought to Workshop
2
Customer Problem Analysis (See page
)
3
Connect the OBD II scan tool or hand-held tester to DLC3
4
Check and Clear DTC and Freeze Frame Data (See page
5
Visual Inspection
6
Setting the Check Mode Diagnosis (See page
)
7
Problem Symptom Confirmation
Symptom does not occur: Go to step 8
Symptom occur: Go to step 9
8
9
DTC Check (See page
DTC is not output: Go to step 10
DTC is output: Go to step 17
-
DIAGNOSTICS
ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
05-385
538
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
10
Basic Inspection (See page
NG
Go to step 19
OK
11
Mechanical System Test (See page
NG
Go to step 16
OK
12
Manual Shifting Test (See page
)
NG
Go to step 14
OK
13
Problem Symptoms Table Chapter 1 (See page
NG
Go to step 18
OK
14
Problem Symptoms Table Chapter 2 (See page
NG
Go to step 16
OK
15
Problem Symptoms Table Chapter 3 (See page
NG
16
Part Inspection
Go to step 19
17
)
18
Circuit Inspection (See page
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