Voltage should be:
3.56 V with no sunlight or sensor covered up
Less than 3.56 V with sunlight on sensor (depending on sunlight intensity)
4. If the voltage is not as specified, replace the sunlight sensor.
Fig. 149: Identifying Sunlight Sensor And Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
A/C SYSTEM TEST RESULT (CLIMATE CONTROL)
Test Results
Related Symptoms
Probable Cause
Low refrigerant charge
Driver's and passenger's
side A/C vent
temperatures may vary
by approximately 20° F
(11°C) or more
Suction pressure may be low
Expansion valve not
opening sufficiently
Driver's or passenger's air mix door DTCs
present
One air mix door stuck or
inoperative
Discharge pressure reduced when A/C
condenser cooled with water spray
Significant refrigerant
overcharge
Restricted/weak airflow through A/C
condenser
Dirty A/C condenser or
damaged fins
Discharge pressure
abnormally High
With doors open, fresh air selected, and
radiator and A/C condenser fans run on
high speed, temperature drop across A/C
condenser inlet to outlet is less than
about 41 °F (5 °C) while A/C
Debris between A/C
condenser and radiator
Radiator and/or A/C
condenser fan(s)
compressor is running
malfunctioning
Suction and discharge pressures equalize
rapidly after stopping A/C compressor
Discharge pressure
abnormally Low
Faulty A/C compressor
discharge valve or seal
Suction pressure higher than normal
Restricted blower intake or
dust and pollen filter
Weak or insufficient airflow across evaporator
Suction pressure varies from near normal to a
vacuum, as moisture freezes in expansion
valve orifice
Moisture in the system
Faulty expansion valve
Evaporator freezing
Suction pressure
abnormally Low
Faulty evaporator
temperature sensor
(check DTC)
Reduced airflow from vents
Vent temperature is very low
Faulty expansion valve
or A/C compressor
clutch relay stuck in the
on position
Lack of slight suction pressure variation
at 1, 00 rpm when "Recirculated"
airflow is switched to "Fresh Air"
Suction pressure
abnormally High
Expansion valve stuck open or
open too long
Discharge pressure near normal
A sheet of paper does not stick to front
of A/C condenser surface with cooling
fans on
Radiator and/or A/C condenser
fan motor(s) inoperative or
wires reversed
With doors open, fresh air selected and
radiator and A/C condenser fan run on
high speed, temperature drop across A/C
condenser inlet to outlet is less than
about 41 °F (5 °C)
Suction and Discharge
pressures abnormally
High
Insufficient A/C
compressor clutch
clearance
A/C compressor clutch remains engaged
during off cycle
A/C compressor clutch
relay stuck in the on
position or circuit
problem
A/C compressor relief valve may open
Excessive air in system
Suction line from expansion valve to A/C
compressor is not cold
Excessively low refrigerant
charge
Lack of slight suction pressure variation at 1, Expansion valve clogged with
00 rpm when "Recirculated" airflow is
switched to "Fresh Air"
debris/desiccant, stuck closed,
or not opening sufficiently
Blocked or restricted A/C
condenser internal passages or
lines/components restricting
refrigerant flow
More than 50 - 60 °F (10 - 16 °C) temperature
drop across A/C condenser inlet to outlet pipes
Significant temperature difference along high
or low side A/C lines or components
Suction and Discharge
pressures abnormally
Low
Restriction in A/C suction or
discharge lines or components
(check temperatures to isolate)
NOTE:
Some restrictions may not show up until 3,
00 rpm
Suction pressure High
and Discharge pressure
Low
Excessive A/C compressor noise
A/C compressor internal
damage (Check for A/C system
debris contamination)
Pressures equalize quickly and noise
after A/C compressor turns off
Slightly low refrigerant
charge
Air mix door sticking,
misadjusted or
inoperative
Vent temperature too high
Suction and discharge
pressures slightly low
Excessive refrigerant oil
in system
Air/Non-condensable
gasses in system
Static pressures high with A/C system
equalized. (After engine is off 4 - 12 hours)
Contaminated or
incorrect refrigerant
A/C SYSTEM TEST RESULT (MANUAL A/C)
Test Results
Related Symptoms
Probable Cause
Low refrigerant charge
Driver's and passenger's
side A/C vent
temperatures may vary
by approximately 20° F
(11°C) or more
Suction pressure may be low
Expansion valve not
opening sufficiently
Air mix door stuck or
inoperative
Air mix door DTCs present
Discharge pressure reduced when A/C
condenser cooled with water spray
Significant refrigerant
overcharge
Restricted/weak airflow through A/C
condenser
Dirty A/C condenser or
damaged fins
Discharge pressure
abnormally High
With doors open, fresh air selected, and
radiator and A/C condenser fans run on
high speed, temperature drop across A/C
condenser inlet to outlet is less than
about 41 °F (5 °C) while A/C
Debris between A/C
condenser and radiator
Radiator and/or A/C
condenser fan(s)
malfunctioning
compressor is running
2024 Honda CR-V Owner's Manual
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