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Contents Section: Cooling Fan All sections

Fan Controls Acura RDX I рестайлинг

Cooling Fan 8 illustrations ~672 words

Scheme 50

Scheme 50: Component Location Index
Scheme 50: Component Location Index

Symptom Troubleshooting Index

SymptomDiagnostic ProcedureAlso check for
Engine overheatsCheck the coolant level. Check for any engine coolant leaks (from gaskets, hoses, O-rings, etc.). Check for dirt, leaves, or insects on the radiator and A/C condenser. Check for deteriorated coolant. Check for a damaged or deformed fan shroud. Check that the fan motors are operating properly (air should be blowing toward the engine). Inspect the fan motors (see FAN MOTOR TEST ) or fan relays (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 a plugged or deteriorated radiator hoses. Check for plugged heater core or hoses. Check for a damaged cylinder head gasket.Check the radiator and A/C condenser fan are operating properly.
The radiator fan does not run at high speedRadiator fan high speed circuit troubleshooting.Check the connectors are properly connected and the terminals are making good contact.
Both the radiator fan and the A/C condenser fan do not run at low speedRadiator and A/C condenser fan low speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING ).Check the connectors are properly connected and the terminals are making good contact.
The A/C condenser fan does not run at all high speedA/C condenser fan high speed circuit troubleshooting (see A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING ).Check the connectors are properly connected and the terminals are making good contact.

Scheme 51

Scheme 51: Circuit Diagram
Scheme 51: Circuit Diagram

Scheme 52

Scheme 52: Radiator Fan High Speed Circuit Troubleshooting
Scheme 52: Radiator Fan High Speed Circuit Troubleshooting

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Scheme 57
  1. Check the No. 6 (30 A) and the No. 15 (7.5 A) fuse in the under-hood fuse/relay box. Are the fuses OK? YES -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 PCM, the under-hood fuse/relay box and the radiator fan motor, the under-hood fuse/relay box and the A/C condenser fan motor, and the under-dash fuse/relay box connector terminal and the under-hood fuse/relay box.
  2. Remove the radiator fan relay from the under-hood fuse/relay box and test it (see «POWER RELAY TEST»(/acura/rdx/i-2009-2012/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES -Go to step 3. NO -Replace the radiator fan relay.
  3. Measure the voltage between the radiator fan relay 4P socket terminal No. 1 and the body ground. Is there battery voltage? YES -Go to step 4. NO -Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ).
  4. Connect radiator fan relay 4P socket terminals No. 1 and No. 2 with a jumper wire. Does the radiator fan run at high speed? YES -Go to step 8 . NO -Go to step 5.
  5. Disconnect the radiator fan motor 2P connector, then test the fan motor (see «FAN MOTOR TEST»(/acura/rdx/i-2009-2012/remont/cooling-fan/#engine-cooling-system) ). Is the fan motor OK? YES -Go to step 6. NO -Replace the radiator fan motor (see «FAN, FAN MOTOR, AND SHROUD REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/cooling-fan/#engine-cooling-system) ), then retest.
  6. Check for continuity between radiator fan motor 2P connector terminal No. 1 and body ground. Is there continuity? YES -Go to step 7. NO -Repair an open in the wire between radiator fan motor 2P connector terminal No. 1 and body ground (G201).
  7. Check for continuity between radiator fan relay 4P socket terminal No. 2 and radiator fan motor 2P connector terminal No. 2. Is there continuity? YES -Check for poor connections or loose terminals at the under-hood fuse/relay box and the radiator fan motor. If it is OK, replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ). NO -Repair an open in the wire between radiator fan relay 4P socket terminal No. 2 and radiator fan motor 2P connector terminal No. 2.
  8. Turn the ignition switch to ON (II).
  9. Measure the voltage between the radiator fan relay 4P socket terminal No. 4 and the body ground. Is there battery voltage? YES -Go to step 10. NO -Check the A/C diode B in the under-hood fuse/relay box. If the diode is OK, replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ).
  10. Turn the ignition switch to LOCK (0).
  11. Connect the HDS to the DLC (see «HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM)»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__how-to-use-the-hds-honda) ).
  12. Turn the ignition switch to ON (II).
  13. Make sure the HDS communicates with the vehicle and the PCM. If it does not communicate, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
  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 PCM from damage.
  15. Disconnect PCM connector A (44P).
  16. Check for continuity between PCM connector terminal A5 and radiator fan relay 4P socket terminal No. 3. Is there continuity? YES -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Repair an open in the wire between radiator fan relay 4P socket terminal No. 3 and PCM connector terminal A5.

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