2. CHECK THE COOLANT LEVEL
3. CHECK THE RADIATOR CAP
4. Check the engine coolant
temperature (ECT) during normal
operation with the HDS
5. Check the heater core inlet hose
temperature:
ο¬
If it is COLD, check for
restrictions in the hose, a
damaged or leaking
thermostat, or a damaged or
leaking water pump
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If it is HOT, check for
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HVAC DTCS
Insufficient heating
restrictions in the heater core.
Back flush or replace the
heater core See AIR MIX
CONTROL MOTOR TEST,
DRIVER'S AIR MIX
Damaged cylinder head gasket
CONTROL MOTOR TEST
or PASSENGER'S AIR MIX
CONTROL MOTOR TEST
6. DO THE AIR MIX CONTROL
MOTOR TEST
7. Check the blower motor unit for
obstructions
8. Check for air leaks around the ducts
and vents
A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING (CLIMATE
CONTROL)
Fig. 12: A/C Compressor Clutch Circuit Troubleshooting Flow Chart
Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE:
ο¬
It is normal for the A/C compressor to turn off under certain conditions,
such as low idle, high engine coolant temperature, or hard acceleration.
ο¬
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Do not use this troubleshooting procedure if the fans are also inoperative
with the A/C on. Refer to the symptom troubleshooting index.
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. Fuse check:
ο‘
1. Check the following fuse.
Fuse No. A27 (7.5 A)
Location Under-hood fuse/relay box
Is the fuse OK?
YES : Go to step 2.
NO : Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. A27 (7.5 A) fuse
circuit.
2. A/C pressure threshold check:
ο‘
ο‘
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1. Connect the HDS to the DLC.
2. Start the engine.
3. Set the A/C button and the fan control button to ON.
4. Using the HDS, check the under following conditions:
Threshold Current conditions
Signal
Values Unit Values
Unit
ENGINE SPEED 710 - 810 rpm
176 - 212 Β°F
80 - 100 Β°C
About 0.5 V
ECT SENSOR 2
TP SENSOR
ο‘
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 3.
NO : Go to the A/C SYSTEM TEST RESULT.
3. Climate control system check:
ο‘
1. Check the parameter(s) below with the HDS.
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 step 4.
NO : A/C SWITCH is OFF, go to the A/C SIGNAL CIRCUIT TROUBLESHOOTING.
NO : A/C SWITCH is ON and A/C CLUTCH is OFF, 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.
4. A/C compressor clutch relay check:
ο‘
1. Turn the ignition switch to LOCK (0).
ο‘
2. Remove the A/C compressor clutch relay from the under-hood fuse/relay box, and test it See
POWER RELAY TEST or POWER RELAY TEST .
Is the relay OK?
YES : Go to step 5.
NO : Replace the A/C compressor clutch relay.
5. Open wire check (+B MG CLUTCH line):
ο‘
1. Measure the voltage between test points 1 and 2.
Test condition IG LOCK (0)
A/C compressor clutch relay: disconnected
Test circuit +B MG CLUTCH
Test point 1 A/C compressor clutch relay 4P socket No. 1 (PNK) (Built into the under-hood
fuse/relay box)
Test point 2 Body ground
Fig. 13: Measuring Voltage Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES : The +B MG CLUTCH wire is OK. Go to step 6.
NO : An open in the +B MG CLUTCH wire. REPLACE THE UNDER-HOOD FUSE/RELAY BOX .
6. Determine possible failure area (A/C compressor clutch relay switch side circuit, A/C compressor clutch
relay coil side circuit):
ο‘
1. Connect terminals A and B with a jumper wire.
Terminal A A/C compressor clutch relay 4P socket No. 1 (PNK) (Built into the under-hood
fuse/relay box)
Terminal B A/C compressor clutch relay 4P socket No. 2 (PUR) (Built into the under-hood
fuse/relay box)
Fig. 14: Connecting Terminals A And B Using Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Does the A/C compressor clutch click?
YES : Go to step 7.
NO : Go to step 9.
7. Open wire check (IG2 A/C line):
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1. Disconnect the jumper wire.
2. Turn the ignition switch to ON (II).
3. Measure the voltage between test points 1 and 2.
Test condition IG ON (II)
A/C compressor clutch relay: disconnected
Test circuit IG2 A/C
Test point 1 A/C compressor clutch relay 4P socket No. 7 (PNK) (Built into the under-hood
fuse/relay box)
Test point 2 Body ground
Fig. 15: Measuring Voltage Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES : The IG2 A/C wire is OK. Go to step 8.
NO : Repair an open in the wire between the No. B22 (7.5 A) fuse in under-dash fuse/relay box and the
A/C compressor clutch relay.
8. Open wire check (A/C MG CLUTCH RLY CL- line):
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1. Turn the ignition switch to LOCK (0).
2. Reinstall the A/C compressor clutch relay.
3. Jump the SCS line with the HDS.
NOTE:
This step must be done to protect the PCM from damage.
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4. Disconnect the following connector.
PCM connector A (49P)
5. Connect terminals A and B with a jumper wire.
Terminal A PCM connector A (49P) terminal No. 12 (GRN)
Terminal B Body ground
Fig. 16: Connecting Terminals A And B Using Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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6. Turn the ignition switch to ON (II).
Does the A/C compressor clutch click?
YES : 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.
NO : Repair an open in the wire between the A/C compressor clutch relay and the PCM.
9. Open wire check (A/C MG CLUTCH line):
ο‘
1. Disconnect the jumper wire.
ο‘
2. Disconnect the following connector.
A/C compressor clutch 3P connector
3. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
ο‘
A/C compressor clutch relay: disconnected
A/C compressor clutch 3P connector: disconnected
Test circuit A/C MG CLUTCH
Test point 1 A/C compressor clutch relay 4P socket No. 2 (PUR) (Built into the under-hood
fuse/relay box)
Test point 2 A/C compressor clutch 3P connector No. 1 (BLU)
Fig. 17: Checking For Continuity Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : The A/C MG CLUTCH wire is OK. Check the A/C COMPRESSOR CLUTCH CLEARANCE
and the A/C COMPRESSOR CLUTCH FIELD COIL . Repair as needed.
NO : Repair an open in the wire between the A/C compressor clutch relay and the A/C compressor
clutch.
A/C COMPRESSOR CLUTCH 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
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2015 Honda CR-V Owner's Manual
