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Fan Controls (v6) Acura TSX II

Cooling Fan 9 illustrations ~788 words

Scheme 33

Scheme 33: Component Location Index
Scheme 33: 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 damaged or deformed fan shrouds. Check the fan motors for proper direction of operation (blowing air 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 plugged or deteriorated radiator hoses. Check for plugged heater core or hoses. Check for a damaged cylinder head gasket.Proper radiator and condenser fan control and operation
The radiator fan does not run at high speedRadiator fan high speed circuit troubleshooting (see RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING ).Cleanliness and tightness of all connectors
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 ).Cleanliness and tightness of all connectors
The A/C condenser fan does not run at high speedA/C condenser fan high speed circuit troubleshooting (see A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING ).Cleanliness and tightness of all connectors

SYMPTOM CHART

Scheme 34

Scheme 34: Circuit Diagram
Scheme 34: Circuit Diagram

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Scheme 35: Radiator Fan High Speed Circuit Troubleshooting
Scheme 35: Radiator Fan High Speed Circuit Troubleshooting

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  1. Check the No. 3-6 (30 A) fuse, the No. 14 (15 A) fuse, and the No. 21 (7.5 A) fuse in the under-hood fuse/relay box, and the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box. Are the fuses OK? YES -Reinstall the fuses, 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. 3-6 (30 A) fuse, the No. 14 (15 A) fuse, the No. 21 (7.5 A) fuse, and the No. 16 (7.5 A) fuse circuit.
  2. Disconnect and remove the relay circuit board from the under-hood fuse/relay box, and test it (see «FIVE-TERMINAL TYPE»(/acura/tsx/ii-2008-2014/remont/body-electrical/#relays-v6__five-terminal-type) ). Is the relay circuit board OK? YES -Go to step 3 . NO -Replace the relay circuit board.
  3. Measure the voltage between under-hood fuse/relay box connector terminal C1 and body ground. UNDER-HOOD FUSE/RELAY BOX CONNECTOR C (5P) Is there battery voltage? YES -Go to step 4 . NO -Replace the under-hood fuse/relay box.
  4. Connect under-hood fuse/relay box connector terminals C1 and B2 with a jumper wire. UNDER-HOOD FUSE/RELAY BOX CONNECTOR C (5P) Wire side of female terminals UNDER-HOOD FUSE/RELAY BOX CONNECTOR B (14P) Wire side of female terminals Does the radiator fan run at high speed? YES -Remove the jumper wire, then go to step 8 . NO -Remove the jumper wire, then go to step 5 .
  5. Disconnect the radiator fan motor 2P connector, then test the fan motor (see «FAN MOTOR TEST»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-v6) ). 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/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-v6) ).
  6. Check for continuity between radiator fan motor 2P connector terminal No. 1 and body ground. RADIATOR FAN MOTOR 2P CONNECTOR 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.
  7. Check for continuity between under-hood fuse/relay box connector terminal B2 and radiator fan motor 2P connector terminal No. 2. RADIATOR FAN MOTOR 2P CONNECTOR Wire side of female terminals UNDER-HOOD FUSE/RELAY BOX CONNECTOR B (HP) Wire side of female terminals Is there continuity? YES -Check for poor connections or loose terminals at the under-hood fuse/relay box and the radiator fan motor, the radiator fan motor and body ground G301. NO -Repair an open in the wire between under-hood fuse/relay box connector terminal B2 and radiator fan motor 2P connector terminal No. 2.
  8. Turn the ignition switch to ON (II).
  9. Measure the voltage between under-hood fuse/relay box connector terminal B3 and body ground. UNDER-HOOD FUSE/RELAY BOX CONNECTOR B (14P) Is there battery voltage? YES -Go to step 10 . NO -Repair an open in the wire between driver's under-dash fuse/relay box connector terminal F26 and under-hood fuse/relay box connector terminal B3.
  10. Measure the voltage between under-hood fuse/relay box connector terminal B7 and body ground. UNDER-HOOD FUSE/RELAY BOX CONNECTOR B (14P) Is there battery voltage? YES -Go to step 11 . NO -Check the PGM-FI subrelay (see «POWER RELAY TEST»(/acura/tsx/ii-2008-2014/remont/body-electrical/#relays-v6__power-relay-test) ). If the relay is OK, replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-hood-fuserelay-box-v6__removal-and-installation) ).
  11. Turn the ignition switch to LOCK (0).
  12. Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-v6) ).
  13. Turn the ignition switch to ON (II).
  14. 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-v6__dlc-circuit-troubleshooting) ).
  15. 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.
  16. Disconnect PCM connector A (49P).
  17. Check for continuity between PCM connector terminal A5 and under-hood fuse/relay box connector terminal B11. UNDER-HOOD FUSE/RELAY BOX CONNECTOR B (14P) Wire side of female terminals Is there continuity? YES -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-v6__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-v6__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-v6__pcm-replacement) ). NO -Repair an open in the wire between under-hood fuse/relay box connector B11 and PCM connector terminal A5.

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