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Fan Controls (4-cyl) Acura TSX II

Cooling Fan 10 illustrations ~742 words

Component Location Index

Fan Controls

Scheme 84

Scheme 84: Component Location Index
Scheme 84: 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: Radiator fan relay (see POWER RELAY TEST ) A/C condenser fan relay (see FIVE-TERMINAL TYPE ) Fan control relay (see FIVE-TERMINAL TYPE ) Check the radiator cap (see RADIATOR CAP TEST ). Check the thermostat (see THERMOSTAT 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 A/C 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 TROUBLESHOOTING CHART

Scheme 85

Scheme 85: Circuit Diagram
Scheme 85: Circuit Diagram

Scheme 86

Scheme 86: Radiator Fan High Speed Circuit Troubleshooting
Scheme 86: Radiator Fan High Speed Circuit Troubleshooting

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Scheme 90

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Scheme 92
Scheme 92
  1. Check the No. 3-6 (30 A) fuse in the under-hood fuse/relay box and No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box. Are the fuses OK? YES -Go to. 2. NO -Replace the fuse(s) and recheck. If the fuse(s) blow again, repair the short to ground on the No. 3-6 (30A) fuse and the No. 16 (7.5A) fuse circuit.
  2. Disconnect and remove the radiator fan relay and the relay circuit board from the under-hood fuse/relay box, then test the radiator fan relay (see «POWER RELAY TEST»(/acura/tsx/ii-2008-2014/remont/body-electrical/#relays-4-cyl__power-relay-test) ) and relay circuit board (see «FIVE-TERMINAL TYPE»(/acura/tsx/ii-2008-2014/remont/body-electrical/#relays-4-cyl__five-terminal-type) ). Are the radiator fan relay and the relay circuit board OK? YES -Go to step 3. NO -Replace the radiator fan relay and/or the relay circuit board.
  3. Test the radiator fan motor (see «FAN MOTOR TEST»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-4-cyl) ). Is the motor OK? YES -Go to step 4. 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-4-cyl) ).
  4. Measure the voltage between radiator fan relay 4P socket terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 5. NO -Replace the under-hood fuse/relay box.
  5. Turn the ignition switch to ON (II).
  6. Measure the voltage between under-hood fuse/relay box connector terminal B2 and body ground. Is there battery voltage? YES -Turn the ignition switch to LOCK (0), then go to step 7. 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 B2.
  7. Check for continuity between radiator fan relay 4P socket terminal No. 4 and under-hood fuse/relay box connector terminal B10. Is there continuity? YES -Go to step 8. NO -Replace the under-hood fuse/relay box.
  8. Disconnect the radiator fan motor 2P connector.
  9. 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 10. 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.
  10. Check for continuity between radiator fan motor 2P connector terminal No. 1 and under-hood fuse/relay box connector B11. Is there continuity? YES -Go to step 11. NO -Repair an open in the wire between radiator fan motor 2P connector terminal No. 1 and under-hood fuse/relay box connector B11.
  11. Check for continuity between under-hood fuse/relay box connector B1 and body ground. UNDER-HOOD FUSE/RELAY BOX CONNECTOR B (14P) Is there continuity? YES -Go to step 12. NO -Repair an open in the wire between under-hood fuse/relay box connector B1 and body ground. If the wire is OK, check for a poor ground at G301.
  12. Connect the HDS to the DLC (see step 2 on «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl) ).
  13. Turn the ignition switch to ON (II).
  14. Make sure the HDS communicates with the vehicle and the ECM/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-4-cyl__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 ECM/PCM from damage.
  16. Disconnect ECM/PCM connector A (49P)
  17. Check for continuity between radiator fan relay 4P socket terminal No. 3 and ECM/PCM connector terminal A5. Is there continuity? YES -Go to step 18. NO -Repair an open in the wire between under-hood fuse/relay box 4P socket terminal No. 3 and ECM/PCM connector terminal A5.
  18. Check for continuity between under-hood fuse/relay box connector D10 and ECM/PCM connector terminal A6.

Scheme 93

Scheme 93
Scheme 93

Is there continuity?

YES -Update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), or substitute a know-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck if the symptom/indicate goes away with a know goods ECM/PCM replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).

NO -repair an open in the wire between under-hood fuse/relay box connector D10 and ECM/PCM connector terminal A6.

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