Radiator Fan High Speed Circuit Troubleshooting
Radiator Fan High Speed Circuit Troubleshooting
'10 model
1. Check the No. 3-8 (30 A) fuse in the under-hood fuse/relay box and No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box.
Are the fuses OK?
YES -
Reinstall the fuse(S), then go to step 2.
NO -
Replace the fuse(s) and recheck. If the fuse continues to blow, locate and repair the short in the circuit between the under-hood fuse/relay box and the relay circuit board, the under-hood fuse/relay box and the radiator fan motor, the driver's underdash fuse/relay box connector terminal F26 and the under-hood fuse/relay box connector terminal B10.�
2. Remove the radiator fan relay and disconnect and remove the relay circuit board from the under-hood fuse/relay box, and test it Testing and Inspection.
Is the relay and/or the relay circuit board OK?
YES -
Go to step 3.
NO -
Replace the radiator fan relay and/or the relay circuit board.�
3. Test the radiator fan motor Testing and Inspection.
Is the motor OK ?
YES -
Go to step 4.
NO -
Replace the radiator fan motor Radiator and A/C Condenser Fan, Motor, and Shroud Removal and Installation.
4. Measure the voltage between under-hood fuse/ relay box connector terminal B1 and body ground.
Is there battery voltage?
YES -
Go to step 5.
NO -
Replace the under-hood fuse/relay box.�
5. Turn the ignition switch to ON (II).
6. Measure the voltage between under-hood fuse/ relay box connector terminal B10 and body ground.
Is there battery voltage?
YES -
Go to step 7.
NO -
Repair open in the wire between driver's under-dash fuse/relay box connector terminal F26 and under-hood fuse/relay box connector terminal B10.�
7. Turn the ignition switch to LOCK (0).
8. Check for continuity between radiator fan motor 2P connector terminal No. 2 and under-hood fuse/relay box connector terminal C4.
Is there continuity?
YES -
Go to step 9.
NO -
Repair open in the wire between radiator fan motor 2P connector terminal No. 2 and under-hood fuse/relay box connector terminal No.4.�
9. Check for continuity between under-hood fuse/ relay box connector terminal C3 and radiator fan motor 2P connector terminal No. 1.
Is there continuity?
YES -
Go to step 10.
NO -
Repair open in the wire between the under-hood fuse/relay box connector terminal C3 and radiator fan motor 2Pconnector terminal No.2.�
10. Check for continuity between under-hood fuse/ relay box connector terminal C5 and body ground.
Is there continuity?
YES -
Go to step 11.
NO -
Repair open in the wire between under-hood fuse/relay box connector terminal C5 and body ground. If the wire is OK, check for a poor ground G301.�
11. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) Initial Inspection and Diagnostic Overview.
12. Turn the ignition switch to ON (II).
13. Make sure the HDS communicates with the vehicle and the engine control module (ECM)/powertrain control module (PCM). If it does not communicate, troubleshoot the DLC circuit Testing and Inspection.
14. Jump the SCS line with the HDS, then turn the ignition switch to LOCK (0).
NOTE: This step must be done to protect the ECM/PCM from damage.
15. Disconnect ECM/PCM connector A (49P).
16. Check for continuity between under-hood fuse/relay box connector terminal B8 and ECM/PCM connector terminal A5.
Is there continuity?
YES -
Go to step 17.
NO -
Repair open in the wire between ECM/PCM connector terminal A5 and under-hood fuse/relay box connector terminal B8.�
17. Check for continuity between under-hood fuse/relay box connector terminal B11 and ECM/PCM connector terminal A6.
Is there continuity?
YES -
Update the ECM/PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good ECM/PCM Initial Inspection and Diagnostic Overview, then recheck. If the symptom/indication goes away with a known good ECM/PCM, replace the original ECM/PCM Service and Repair.�
NO -
Repair open in the wire between ECM/PCM connector terminal A6 and under-hood fuse/relay box connector terminal B11.�