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)
Fig. 18: A/C Compressor Clutch Circuit Troubleshooting Flow Chart
Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE:
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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.
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Do not use this troubleshooting procedure if the radiator and A/C
condenser 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:
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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:
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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 dial 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
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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. HVAC control system check:
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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 substitute a known-good
PCM See PCM REMOVAL AND INSTALLATION or PCM UPDATE , and recheck.
4. A/C compressor clutch relay check:
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1. Turn the ignition switch to LOCK (0).
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2. Remove the A/C compressor clutch relay from the under-hood fuse/relay box, and TEST IT .
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):
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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. 19: 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):
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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. 20: 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. 21: 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 the 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) No. 12 (GRN)
Terminal B Body ground
Fig. 22: Connecting Terminals A And B With 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):
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1. Disconnect the jumper wire.
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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)
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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. 23: 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 CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING
(CLIMATE CONTROL)
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