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DI-600
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI3W2-1 1
DTC 21 Solar Sensor Circuit
CIRCUIT DESCRIPTION
A photo diode in the solar sensor detects solar radiation and
Resistance of photodiode
sends signals to the A/C control assembly.
High
Low
Weak Strong
Strength of solar radiation
DTC No Detection Item Trouble Area
S Solar sensor
Open or short in solar sensor circuit.
S Harness or connector between solar sensor and A/C control
21 Please note that display of diagnostic trouble code 21 is not
assembly
abnormal when the sensor is not receiving solar radiation.
S A/C control assembly
WIRING DIAGRAM
A/C Amplifier
11 S5
Y
A31
1
A34
Solar Sensor
2
5
TS
A30
P
I09244
2002 4RUNNER (RM887U)
Author : Date : 776
DI-601
DIAGNOSTICS - AIR CONDITIONING SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminals S5 and TS of A/C control assembly connector.
PREPARATION:
ON Remove A/C control assembly with connectors still connected.
CHECK:
(a) Turn ignition switch to ON.
(b) Measure voltage between terminals S5 and TS of A/C
control assembly connector when the solar sensor is sub-
S5 (-) TS (+) jected to an electric light, and when the sensor is covered
by a cloth.
OK:
Condition Voltage
Sensor subjected to electric light Below 4.0 V
Sensor covered by a cloth 4.0 - 4.5 V
BE3840
HINT:
I00324 I00336
As the inspection light is moved away from the sensor, the volt-
age increases.
NG Go to step 2.
OK
Proceed to next circuit inspection shown on problem symptoms table (See page DI-586 ). Howev-
er, if DTC 21 is displayed, check and replace A/C control assembly.
2002 4RUNNER (RM887U)
Author : Date : 777
DI-602
DIAGNOSTICS - AIR CONDITIONING SYSTEM
2 Check solar sensor.
PREPARATION:
Remove solar sensor (See page AC-73 ).
CHECK:
(a) Cover the sensor with a cloth.
(b) Measure resistance between terminals 1 and 2 of solar
sensor connector.
HINT:
Connect positive (+) lead of ohmmeter to terminal 1 and nega-
tive (-) lead to terminal 2 of the solar sensor.
OK:
Resistance : (no continuity)
PREPARATION:
(a) Remove the cloth from the solar sensor and subject the
I00325 sensor to electric light.
(b) Measure resistance between terminals.
OK:
Resistance : Approx. 10 k (continuity)
HINT:
As the electric light is moved away from the sensor, the resis-
tance increases.
NG Replace solar sensor.
OK
3 Check harness and connector between A/C control assembly and solar sensor
(See page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace A/C control assembly.
2002 4RUNNER (RM887U)
Author : Date : 778
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