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Acura RL. Manual - part 741

13. Check the radiator fan and the condenser fan operation.

Do both fans keep running?

YES - Go to step 25.

NO - Go to step 14.

14. Turn the ignition switch OFF.

15. Check the No. 23 IGP (7.5A) fuse in the driver's under-dash fuse/relay box.

Is the fuse blown?

YES - Repair short in the wire the RFC unit relay and the No. 23 IGP (7.5A) fuse. Also replace the
No. 23 IGP (7.5A) fuse, then go to step 52.

NO - Go to step 16.

16. Check the No. 34 RFC (50A) fuse in the battery terminal fuse box.

Is the fuse blown?

YES - Go to step 31.

NO - Go to step 17.

17. Disconnect the RFC unit IP connector.

18. Turn the ignition switch ON (II), and wait 3 minutes or more.

19. Measure voltage between the RFC unit IP connector terminal and body ground.

Fig. 2: Measuring Voltage Between RFC Unit IP Connector Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 20.

NO - Go to step 39.

2007 Acura RL

2005-08 ENGINE PERFORMANCE Radiator Fan Control (RFC) System - RL

Friday, June 05, 2009 2:37:42 PM

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20. Turn the ignition switch OFF.

21. Check for continuity between PCM connector terminal E6 and body ground.

Fig. 3: Checking Continuity Between PCM Connector Terminal E6 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 22.

NO - Substitute a known-good RFC unit (see A/C CONDENSER FAN CIRCUIT
TROUBLESHOOTING (SHORT) ), then go to step 52 and recheck. If DTC P0480 is not indicated,
replace the original RFC unit (see A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING
(SHORT) ), then go to step 52.

22. Jump the SCS line with the HDS.

23. Disconnect PCM connector E (31P).

24. Check for continuity between PCM connector terminal E6 and body ground.

Fig. 4: Checking Continuity Between PCM Connector Terminal E6 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between the PCM (E6) and the RFC unit, then go to step 52.

NO - Go to step 58.

25. Measure voltage between PCM connector terminal E6 and body ground.

2007 Acura RL

2005-08 ENGINE PERFORMANCE Radiator Fan Control (RFC) System - RL

Friday, June 05, 2009 2:37:42 PM

Page 4

Fig. 5: Measuring Voltage Between PCM Connector Terminal E6 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES - Go to step 58.

NO - Go to step 26.

26. Jump the SCS line with the HDS.

27. Disconnect PCM connector E (31P).

28. Disconnect the RFC unit 3P connector.

29. Connect RFC unit 3P connector terminal No. 1 and body ground with a jumper wire.

Fig. 6: Connecting RFC Unit 3P Connector Terminal No. 1 And Body Ground With Jumper
Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

30. Check for continuity between PCM connector terminal E6 and body ground.

2007 Acura RL

2005-08 ENGINE PERFORMANCE Radiator Fan Control (RFC) System - RL

Friday, June 05, 2009 2:37:42 PM

Page 5

Fig. 7: Checking Continuity Between PCM Connector Terminal E6 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Substitute a known-good RFC unit (see A/C CONDENSER FAN CIRCUIT
TROUBLESHOOTING (SHORT) ), then go to step 52 and recheck. If DTC P0480 is not indicated,
replace the original RFC unit (see A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING
(SHORT) ), then go to step 52.

NO - Repair open in the wire between the PCM (E6) and the RFC unit, then go to step 52.

31. Remove the air cleaner (see AIR CLEANER REMOVAL/INSTALLATION ), and remove the

RFC unit relay (A).

Fig. 8: Identifying RFC Unit Relay
Courtesy of AMERICAN HONDA MOTOR CO., INC.

32. Check for continuity between RFC unit relay 4P connector terminal No. 4 and body ground.

2007 Acura RL

2005-08 ENGINE PERFORMANCE Radiator Fan Control (RFC) System - RL

Friday, June 05, 2009 2:37:42 PM

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