Honda CR-V: A/C Condenser Fan High Speed Circuit Troubleshooting

NOTE:

• Do not use this troubleshooting procedure if the radiator fan and/or A/C compressor is inoperative.

  Refer to the symptom troubleshooting index.

• Before doing symptom troubleshooting, check for powertrain DTCs.

1. Check the No.6 (20 A) and No. 15 (7.5 A) fuses in the under-hood fuse/relay box.

Are the fuses OK? YES-Go to step 2.

NO-Replace the fuses, and recheck. If the fuses blow again, check for a short in the No.6 (20 A) and No. 15 (7.5 A) fuses circuit.

2. Remove the A/C condenser fan relay from the under-hood fuse/relay box, and test it.

Is the relay OK? YES-Go to step 3.

NO-Replace the A/C condenser fan relay.

3. Measure the voltage between the A/C condenser fan relay 4P socket terminal No.1 and body ground.

Is there battery voltage? YES-Go to step 4.

NO-Replace the under-hood fuse/relay box.

4. Connect the A/C condenser fan relay 4P socket terminals No.1 and No.2 with a jumper wire.

Does the A/C condenser fan run on high? YES-Go to step 5.

NO-Replace the under-hood fuse/relay box.

5. Disconnect the jumper wire.

6. Turn the ignition switch ON (II).

7. Measure the voltage between the A/C condenser fan relay 4P socket terminal No.4 and body ground.

Is there battery voltage? YES-Go to step 8.

NO-Go to step 14.

8. Turn the ignition switch OFF.

9. Reinstall the A/C condenser fan relay.

10. Jump the SCS line with the HDS.

NOTE: This step must be done to protect the powertrain control module (PCM) from damage.

11. Disconnect PCM connector A (44P).

12. Connect the PCM connector A (44P) terminal No.5 to body ground with a jumper wire.

13. Turn the ignition switch ON (II).

Does the A/C condenser fan run on high? YES-Check for loose wires or poor connections at PCM connector A (44P) terminal No.5. If the connections are good, substitute a known-good PCM, and recheck. If the symptom/indication goes away, replace the original PCM.

NO-Repair open in the wire between the A/C condenser fan relay and the PCM.

14. Remove A/C diode B from the under-hood fuse/ relay box.

15. Turn the ignition switch ON (II).

16. Measure the voltage between the A/C diode B 2P socket terminal No.2 and body ground.

Is there battery voltage? YES-Go to step 17.

NO-Replace the under-hood fuse/relay box.

17. Using the diode setting () on a DVOM, check for current flow in both directions between the A/C diode B terminals No.1 and No.2.

Is there current flow in only one direction? YES-Replace the under-hood fuse/relay box.

NO-Replace A/C diode B.

A/C Compressor Clutch Circuit Troubleshooting

NOTE:

• It is normal for the A/C compressor to turn off under certain conditions, such as low idle, high engine coolant temperature, hard acceleration, or high/low pressure.
• 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 any symptom troubleshooting, check for powertrain DTCs.

1. Check the No. 20 (7.5 A) fuse in the under-hood fuse/relay box, and the No. 36 (10 A) fuse in the under-dash fuse/relay box.

Are the fuses OK? YES-Go to step 2.

NO-Replace the fuses and recheck. If the fuses blow again, check for a short in the No. 20 (7.5 A) and No. 36 (10 A) fuses circuit.

2. Connect the HDS to the DLC.

3. Start the engine.

4. Turn on the A/C.

5. Check the A/C CLUTCH in the PGM-FI Data List with the HDS.

Is the A/C CLUTCH on? YES-Go to step 7.

NO-Go to step 6.

6. Using the HDS, confirm the following values in the PGM-FI Data List at idle.

Are all the values within specifications? YES-Go to step 7.

NO-Troubleshoot the value that is not within the specifications.

7. 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 8.

NO-Replace the A/C compressor clutch relay.

8. Measure the voltage between the A/C compressor clutch relay 4P socket terminal No. 1 and body ground.

Is there battery voltage? YES-Go to step 9.

NO-Replace the under-hood fuse/relay box.

9. Connect the A/C compressor clutch relay 4P socket terminals No.1 and No.2 with a jumper wire.

Does the A/C compressor clutch click? YES-Go to step 10.

NO-Go to step 19.

10. Disconnect the jumper wire.

11. Turn the ignition switch ON (II).

12. Measure the voltage between the A/C compressor clutch relay 4P socket terminal No.3 and body ground.

Is there battery voltage? YES-Go to step 13.

NO-Repair open in the wire between the No. 36 (10 A) fuse in the under-dash fuse/relay box and the A/C compressor clutch relay.

13. Turn the ignition switch OFF.

14. Reinstall the A/C compressor clutch relay.

15. Jump the SCS line with the HDS.

NOTE: This step must be done to protect the powertrain control module (PCM) from damage.

16. Disconnect PCM connector A (44P).

17. Connect the PCM connector A (44P) terminal No. 14 to body ground with a jumper wire. '

18. Turn the ignition switch ON (II).

Does the A/C compressor click? YES-Check for loose wires or poor connections at PCM connector A (44P). If the connections are good, check the PCM grounds. If the grounds are good, substitute a known-good PCM, and recheck. If the symptom/indication goes away, replace the original PCM.

NO-Repair open in the wire between the A/C compressor clutch relay and the PCM.

19. Disconnect the jumper wire.

20. Disconnect the A/C compressor clutch 3P connector.

21. Check for continuity between the A/C compressor clutch relay 4P socket terminal No.2 and the A/C compressor clutch 3P connector terminal No.3.

Is there continuity? YES-Check the A/C compressor clutch clearance, and the compressor clutch field coil. Repair as needed.

NO-Repair open in the wire between the A/C compressor clutch relay and the A/C compressor clutch.

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