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Cooling Fan Controls Acura RL II

Cooling Fan 9 illustrations ~653 words

Scheme 1

Scheme 1: Component Location Index
Scheme 1: Component Location Index

Symptom Troubleshooting Index

SymptomDiagnostic ProcedureAlso check for
Engine overheatsCheck the coolant level. Check for the coolant leakage (from gaskets, hoses, O-rings, etc.). Check for dirt, leaves, or insects on radiator and condenser. Check for deteriorated coolant. Check for damaged or deformed fan shroud. Inspect the fan motors (see FAN MOTOR TEST ) or fan relay (see POWER RELAY TEST ). Check the radiator cap (see RADIATOR CAP TEST ). Check the thermostat (see FAN MOTOR TEST ). Inspect the water pump (see WATER PUMP INSPECTION ). Check for plugged deteriorated radiator hoses. Check for plugged heater core or hose(s). Check for a damaged cylinder head gasket.
Both the radiator fan and the A/C condenser fan do not run when the engine coolant temperature is above 207°F (97 °C)Check for PGM-FI DTCs. Radiator fan and A/C condenser fan circuit troubleshooting (see RADIATOR FAN AND A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING ).Cleanliness and tightness of all connectors
The A/C condenser runs, but the radiator fan does not run at allCheck for PGM-FI DTCs. Radiator fan circuit troubleshooting (open) (see RADIATOR FAN AND A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING ).Cleanliness and tightness of all connectors
The radiator fan runs, but the A/C condenser fan does not run at allCheck for PGM-FI DTCs. A/C condenser fan circuit troubleshooting (open) (see A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING (OPEN) ).Cleanliness and tightness of all connectors
The radiator fan runs with the ignition switch ON (II), the A/C off, and the engine coolant temperature below 201 °F (94 °C)Check for PGM-FI DTCs. Radiator fan circuit troubleshooting (Short) (see A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING (OPEN) ).Cleanliness and tightness of all connectors
The A/C condenser fan runs with the ignition switch ON (II), the A/C off, and the engine coolant temperature below 201 °F (94 °C)Check for PGM-FI DTCs. A/C condenser fan circuit troubleshooting (Short) (see A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING (SHORT) ).Cleanliness and tightness of all connectors

SYMPTOM TROUBLESHOOTING INDEX

Scheme 2

Scheme 2: Circuit Diagram
Scheme 2: Circuit Diagram

Scheme 3

Scheme 3: Radiator Fan and A/C Condenser Fan Circuit Troubleshooting
Scheme 3: Radiator Fan and A/C Condenser Fan Circuit Troubleshooting
  1. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 under «HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM)»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  2. Turn the ignition switch ON (II), and select the PGM-FI, INSPECTION, and then RADIATOR FAN on the HDS. Does the radiator fan and the A/C condenser fan run? YES - Fan circuit is OK. NO - Go to step 3.
  3. Turn the ignition switch OFF.
  4. Disconnect the radiator fan control (RFC) unit 3P connector.
  5. Check for continuity between RFC unit 3P connector terminal No. 2 and body ground, then terminal No. 3 and body ground. Is there continuity? YES - Replace the RFC unit (see «A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING (SHORT)»(/acura/rl/ii-2004-2008/remont/cooling-fan/#cooling-fan-controls__ac-condenser-fan-circuit-troubleshooting-short) ). NO - Check for an open in the wire between RFC unit 3P connector terminals No. 2, No. 3, and body ground. If the wire is OK, check for a poor ground at G301.

Scheme 4

Scheme 4: Radiator Fan Circuit Troubleshooting (Open)
Scheme 4: Radiator Fan Circuit Troubleshooting (Open)
  1. Test the radiator fan motor (see «FAN MOTOR TEST»(/acura/rl/ii-2004-2008/remont/cooling-system-mechanical/#cooling-system) ). Is the radiator fan motor OK? YES - Go to step 2. NO - Replace the radiator fan motor.
  2. Disconnect the radiator fan control (RFC) unit 3P connector.
  3. Check for continuity between RFC unit 3P connector terminal No. 2 and body ground. Is there continuity? YES - Replace the RFC unit (see «A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING (SHORT)»(/acura/rl/ii-2004-2008/remont/cooling-fan/#cooling-fan-controls__ac-condenser-fan-circuit-troubleshooting-short) ). NO - Check for an open in the wire between RFC unit 3P connector terminal No. 2 and body ground. If the wire is OK, check for a poor ground at G301.

Scheme 5

Scheme 5: A/C Condenser Fan Circuit Troubleshooting (Open)
Scheme 5: A/C Condenser Fan Circuit Troubleshooting (Open)
  1. Test the A/C condenser fan motor (see «FAN MOTOR TEST»(/acura/rl/ii-2004-2008/remont/cooling-system-mechanical/#cooling-system) ). Is the A/C condenser fan motor OK ? YES - Go to step 2. NO - Replace the A/C condenser fan motor.
  2. Disconnect the radiator fan control (RFC) unit 3P connector.
  3. Check for continuity between RFC unit 3P connector terminal No. 3 and body ground. Is there continuity? YES - Replace the RFC unit (see «A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING (SHORT)»(/acura/rl/ii-2004-2008/remont/cooling-fan/#cooling-fan-controls__ac-condenser-fan-circuit-troubleshooting-short) ). NO - Check for an open in the wire between RFC unit 3P connector terminal No. 3 and body ground. If the wire is OK, check for a poor ground at G301.

Radiator Fan Circuit Troubleshooting (Short)

Note. A short in the radiator fan circuit causes the fan to run constantly whenever the ignition switch is ON (II).

Scheme 6

Scheme 6: Radiator Fan Circuit Troubleshooting (Short)
Scheme 6: Radiator Fan Circuit Troubleshooting (Short)
  1. Disconnect the radiator fan motor 2P connector from the radiator fan control (RFC) unit.
  2. Check for continuity between radiator fan motor 2P connector terminal No. 2 and body ground. Is there continuity? YES - Repair short in the wire between radiator fan motor 2P connector terminal No. 2 and body ground. NO - Replace the RFC unit (see «A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING (SHORT)»(/acura/rl/ii-2004-2008/remont/cooling-fan/#cooling-fan-controls__ac-condenser-fan-circuit-troubleshooting-short) ).

A/C Condenser Fan Circuit Troubleshooting (Short)

Note. A short in the A/C condenser fan circuit causes the fan to run constantly whenever the ignition switch is ON (II).

Scheme 7

Scheme 7: A/C Condenser Fan Circuit Troubleshooting (Short)
Scheme 7: A/C Condenser Fan Circuit Troubleshooting (Short)
  1. Disconnect the A/C condenser fan motor 2P connector from the radiator fan control (RFC) unit.
  2. Check for continuity between A/C condenser fan motor 2P connector terminal No. 2 and body ground. Is there continuity? YES - Repair short in the wire between A/C condenser fan motor 2P connector terminal No. 2 and body ground. NO - Replace the RFC unit (see «A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING (SHORT)»(/acura/rl/ii-2004-2008/remont/cooling-fan/#cooling-fan-controls__ac-condenser-fan-circuit-troubleshooting-short) ).

Scheme 8

Scheme 8: RFC Unit Replacement
Scheme 8: RFC Unit Replacement

Scheme 9

Scheme 9
Scheme 9
  1. Remove the right upper fender trim (A), battery trim (B), left upper fender trim (C), then remove the upper grille cover (D).
  2. Disconnect the connectors from the radiator fan control (RFC) unit, then remove the RFC unit.
  3. Install the RFC unit in the reverse order of removal.

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