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Contents Section: Cooling Fan All sections

Fan Controls Acura MDX II рестайлинг

Cooling Fan 11 illustrations ~722 words

Scheme 23

Scheme 23: Component Location Index
Scheme 23: Component Location Index

Symptom Troubleshooting Index

SymptomDiagnostic ProcedureAlso check for
Engine overheatsCheck the coolant level. Check for any engine coolant leakage (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 shrouds. Check the fan motors are operating properly (air should be blowing toward the engine). Inspect the fan motors (see FAN MOTOR TEST ) or fan relays: A/C condenser 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 or deteriorated radiator hoses. Check for a 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 (see RADIATOR 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 fans 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 high speedA/C condenser fans 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

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Scheme 24: Circuit Diagram
Scheme 24: Circuit Diagram

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Scheme 25: Radiator Fan High Speed Circuit Troubleshooting
Scheme 25: Radiator Fan High Speed Circuit Troubleshooting

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  1. Check the No. 16 (30 A) fuse in the under-hood fuse/relay box and the No. 7 (7.5 A) fuse in the under-dash fuse/relay box. Are the fuse(s) OK? YES -Reinstall the fuse(s), then go to step 2. NO -Replace the fuse(s) and recheck. If the fuse(s) blow again, repair the short to ground on the No. 16 (30A) fuse and the No. 7 (7.5A) fuse circuit.
  2. Remove the radiator fan relay and the fan control relay from the under-hood fuse/relay box, and test it (see «POWER RELAY TEST»(/acura/mdx/ii-2010-2013/remont/body-electrical/#relays__power-relay-test) ). Are the relays OK? YES -Go to step 3. NO -Replace the radiator fan relay and/or fan control relay.
  3. Measure the voltage between radiator fan relay 4P socket terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 4. NO -Replace the under-hood fuse/relay box.
  4. Connect fan control relay 5P socket terminals No. 1 and No. 2 with a jumper wire.
  5. 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 -Remove the jumper wire, the go to step 10 . NO -Remove the jumper wire, the go to step 6.
  6. Test the radiator fan motor (see «FAN MOTOR TEST»(/acura/mdx/ii-2010-2013/remont/cooling-fan/#engine-cooling-system) ). Is the fan motor OK? YES -Go to step 7. NO -Replace the radiator fan motor (see «RADIATOR AND FAN REPLACEMENT»(/acura/mdx/ii-2010-2013/remont/cooling-fan/#engine-cooling-system__radiator-and-fan-replacement) ).
  7. Check for continuity between fan control relay 5P socket terminal No. 2 and body ground. Is there continuity? YES -Go to step 8. NO -Repair an open in the wire between fan control relay 5P socket terminal No. 2 and body ground.
  8. 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 -Go to step 9. 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.
  9. Check for continuity between fan control relay 5P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 1. Is there continuity? YES -Go to step 10. NO -Repair an open in the wire between fan control relay 5P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 1.
  10. Turn the ignition switch to ON (II).
  11. Measure the voltage between fan control relay 5P socket terminal No. 5 and body ground. Is there battery voltage? YES -Go to step 12. NO -Repair an open in the wire between the under dash fuse/relay box and the under hood fuse/relay box.
  12. Turn the ignition switch to LOCK (0).
  13. Connect the HDS to the DLC.
  14. Turn the ignition switch to ON (II).
  15. 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/mdx/ii-2010-2013/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
  16. 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.
  17. Disconnect PCM connector A (49P).
  18. Check for continuity between radiator fan relay 4P socket terminal No. 3 and PCM connector terminal A5. Is there continuity? YES -Go to step 19. NO -Repair an open the wire between radiator fan relay 4P socket terminal No. 3 and PCM connector terminal A5.
  19. Check for continuity between fan control relay 5P socket terminal No. 3 and PCM connector terminal A5. Is there continuity? YES -Update the PCM if it does not have the latest software (see «KNOCK SENSOR REPLACEMENT»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#pgm-fi-system) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2010-2013/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/mdx/ii-2010-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Repair an open in the wire between fan control relay 5P socket terminal No. 3 and PCM connector terminal A5.

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