Acura RL. Manual - part 742

Fig. 9: Checking Continuity Between RFC Unit Relay 4P Connector Terminal No. 4 And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between the RFC unit relay and the No. 34 RFC (50A) fuse. Also
replace the No. 34 RFC (50A) fuse, then go to step 52.

NO - Go to step 33.

33. Disconnect the RFC unit 1P connector.

34. Check for continuity between the RFC unit 1P connector terminal and body ground.

Fig. 10: Checking Continuity Between RFC Unit 1P Connector Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between the RFC unit relay (+B line) and the RFC unit. Also replace
the No. 34 RFC (50A) fuse, then go to step 52.

NO - Go to step 35.

35. Disconnect the RFC unit 2P connector (connected to radiator fan motor).

36. Check for continuity RFC unit 2P connector terminal No. 1 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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Fig. 11: Checking Continuity RFC Unit 2P Connector Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between the RFC unit and the radiator fan motor. Also replace the No.
34 RFC (50A) fuse, then go to step 52.

NO - Go to step 37.

37. Disconnect the RFC unit 2P connector (connected to condenser fan motor).

38. Check for continuity RFC unit 2P connector terminal No. 1 and body ground.

Fig. 12: Checking Continuity RFC Unit 2P Connector Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between the RFC unit and the condenser fan motor. Also replace the
No. 34 RFC (50A) fuse, then go to step 52.

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.

39. Turn the ignition switch OFF.

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

RFC unit relay (A).

2007 Acura RL

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

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

Page 8

Fig. 13: Identifying RFC Unit Relay
Courtesy of AMERICAN HONDA MOTOR CO., INC.

41. Check the RFC unit relay (see POWER RELAY TEST ).

Is the RFC relay OK?

YES - Go to step 42.

NO - Replace the RFC unit relay, then go to step 52.

42. Turn the ignition switch ON (II).

43. Measure voltage between RFC unit relay 4P connector terminal No. 4 and body ground.

Fig. 14: Measuring Voltage Between RFC Unit Relay 4P Connector Terminal No. 4 And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 44.

NO - Repair open in the wire between the RFC unit relay and the No. 34 RFC (50A) fuse, then go to
step 52.

44. Measure voltage between RFC unit relay 4P connector terminal No. 3 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 9

Fig. 15: Measuring Voltage Between RFC Unit Relay 4P Connector Terminal No. 3 And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 45.

NO - Repair open in the wire between the RFC unit relay and the No. 23 IGP (7.5A) fuse, then go to
step 52.

45. Connect RFC unit relay 4P connector terminal No. 2 and body ground with a jumper wire.

Fig. 16: Connecting RFC Unit Relay 4P Connector Terminal No. 2 And Body Ground With
Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

46. Check for continuity between the RFC unit 1P connector terminal 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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