ο¬
If no problems are found, the A/C system is operating as designed and the A/C diagnostic process
is complete.
5. Do the REFRIGERANT LEAK CHECK .
ο¬
If any leaks are found, repair the A/C system as needed. Then go to step 6.
If no leaks are found, go to step 7.
ο¬
6. Evacuate See A/C REFRIGERANT RECOVERY , A/C SYSTEM CHARGING or A/C System
Evacuation and recharge the system See A/C REFRIGERANT RECOVERY , A/C SYSTEM
CHARGING or A/C System Evacuation . Then go to step 7.
7. Do the A/C System Test to confirm your repairs.
ο¬
If vent temperature or suction/discharge pressures are within specifications, the repair is confirmed
and the A/C diagnostic process is complete.
ο¬
If vent temperature or suction/discharge pressures are not within specifications, a problem may still
exist. Return to step 1 and recheck your test procedures.
A/C SIGNAL CIRCUIT TROUBLESHOOTING (CLIMATE CONTROL)
Fig. 36: A/C Signal Circuit Troubleshooting Flow Chart
Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE:
ο¬
Do not use this troubleshooting procedure if any of the following items are
operative with the A/C button and the fan control dial to ON: The A/C
condenser fan, the radiator fan, or the A/C compressor. Refer to the
symptom troubleshooting index.
ο¬
ο¬
Do not use this troubleshooting procedure if the A/C system pressure is
abnormal.
Before doing symptom troubleshooting, check for PGM-FI DTCs See HOW
TO TROUBLESHOOT THE A/T SYSTEM or HOW TO TROUBLESHOOT THE
FUEL AND EMISSIONS SYSTEMS .
1. Blower motor operation check:
ο‘
1. Turn the ignition switch to ON (II).
2. Check that the blower motor operates at all speeds.
ο‘
Does the blower motor operate at all speeds?
YES : Go to step 2.
NO : REPAIR THE PROBLEM IN THE BLOWER MOTOR CIRCUIT .
2. Evaporative outlet air temperature check:
ο‘
ο‘
ο‘
1. Start the engine.
2. Set the A/C button and the fan control button to ON.
3. Do the sensor input display mode See HOW TO TROUBLESHOOT THE BODY
ELECTRICAL or HOW TO TROUBLESHOOT THE CLIMATE CONTROL SYSTEM.
Is Sensor #5 (evaporative outlet air temperature) above 3Β°C?
YES : Go to step 3.
NO : Go to step 10.
3. A/C pressure threshold check:
ο‘
ο‘
ο‘
ο‘
ο‘
1. Turn the ignition switch to LOCK (0).
2. Connect the HDS to the DLC.
3. Start the engine.
4. Set the A/C button and the fan control button to ON.
5. Check the parameter(s) below with the HDS.
Threshold
Values Unit
196 - 3, 38 kPa
A/C PRESSURE 2.00 - 32.00
Current conditions
Values Unit
Signal
2
kgf/cm
28.4 - 455.1 psi
Do the current condition(s) match the threshold?
YES : Go to step 4.
NO : Go to the A/C SYSTEM TEST RESULT.
4. Climate control system check:
ο‘
1. Using the HDS, confirm the following values in the PGM-FI Data List at idle.
Threshold Current conditions
Signal
Values Unit Values
Unit
A/C SWITCH ON
A/C CLUTCH ON
Do the current condition(s) match the threshold?
YES : Go to the A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING.
NO : A/C SWITCH is OFF, go to step 5.
NO : A/C SWITCH is ON and A/C CLUTCH is OFF, high ETC 2 will cause the clutch to be off and
switch on, update the PCM See PCM REMOVAL AND INSTALLATION or PCM UPDATE if it
does not have the latest software, or substitute a known-good PCM See PCM REMOVAL AND
INSTALLATION or PCM UPDATE , and recheck.
5. ACS/THERMAL PRT line voltage check:
ο‘
1. Turn the ignition switch to LOCK (0)
2. Disconnect the following connector.
ο‘
Climate control unit 32P connector
ο‘
ο‘
3. Turn the ignition switch to ON (II).
4. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
Climate control unit 32P connector: disconnected
Test circuit ACS
Test point 1 Climate control unit 32P connector No. 24 (LT GRN)
Test point 2 Body ground
Fig. 37: Measuring Voltage Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES : The ACS/THERMAL PRT wire is OK. Go to step 6.
NO : Go to step 7.
6. Climate control unit check:
ο‘
ο‘
ο‘
ο‘
ο‘
1. Turn the ignition switch to LOCK (0).
2. Reconnect the climate control unit 32P connector.
3. Start the engine.
4. Set the A/C button and the fan control button to ON.
5. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
Test circuit ACS
Test point 1 Climate control unit 32P connector No. 24 (LT GRN)
Test point 2 Body ground
Fig. 38: Measuring Voltage Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there 0.2 V or less?
YES : REPLACE THE UNDER-DASH FUSE/RELAY BOX .
NO : REPLACE THE CLIMATE CONTROL UNIT .
7. Open wire check (THERMO/THERMAL PRT line):
ο‘
1. Turn the ignition switch to LOCK (0).
2. Disconnect the following connector.
ο‘
A/C compressor clutch 3P connector
ο‘
ο‘
3. Turn the ignition switch to ON (II).
4. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
Climate control unit 32P connector: disconnected
A/C compressor clutch 3P connector: disconnected
Test circuit THERMO
Test point 1 A/C compressor clutch 3P connector No. 2 (LT BLU)
Test point 2 Body ground
Fig. 39: Measuring Voltage Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES : THERMO/THERMAL PRT wire is OK. Go to step 8.
NO : Go to step 9.
8. A/C compressor thermal protector check:
ο‘
1. Turn the ignition switch to LOCK (0).
ο‘
2. TEST THE A/C COMPRESSOR THERMAL PROTECTOR .
Is the A/C compressor thermal protector OK?
YES : Repair an open in the wire between the climate control unit and the A/C compressor.
NO : REPLACE THE A/C COMPRESSOR THERMAL PROTECTOR .
9. MICU check:
ο‘
1. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
Climate control unit 32P connector: disconnected
A/C compressor clutch 3P connector: disconnected
Test circuit THERMAL PRT
Test point 1 Under-dash fuse/relay box connector D (32P) No. 31 (WHT)
Test point 2 Body ground
Fig. 40: Measuring Voltage Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES : Repair an open in the wire between the A/C compressor and the under-dash fuse/relay box.
NO : REPLACE THE UNDER-DASH FUSE/RELAY BOX .
10. Evaporator temperature sensor check:
ο‘
1. Turn the ignition switch to LOCK (0).
2. Disconnect the following connector.
ο‘
Climate control unit 32P connector
ο‘
3. Measure the resistance between test points 1 and 2.
Test condition IG LOCK (0)
Climate control unit 32P connector: disconnected
Test circuit TEVA, SENSOR COM
Test point 1 Climate control unit 32P connector No. 18 (ORN)
Test point 2 Climate control unit 32P connector No. 23 (GRY)
Fig. 41: Measuring Resistance Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is the resistance less than 24 kohms?
YES : REPLACE THE CLIMATE CONTROL UNIT .
NO : TEST THE EVAPORATOR TEMPERATURE SENSOR .
A/C SIGNAL CIRCUIT TROUBLESHOOTING (MANUAL A/C)
2024 Honda CR-V Owner's Manual
2023 Honda CR-V Owner's Manual
2021 Honda CR-V Owner's Manual
2018 Honda CR-V Owner's Manual
2015 Honda CR-V Owner's Manual
