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Engine Cooling Fan Controls Acura TSX I

Cooling Fan 21 illustrations ~1545 words

Scheme 1

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

Symptom Troubleshooting Index

'04-05 models

SymptomDiagnostic procedureAlso check for
Engine overheatsCheck the coolant level. Check for 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 shrouds. 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 THERMOSTAT TEST ). Inspect the water pump (see WATER PUMP INSPECTION ). Check for plugged or deteriorated radiator hoses. Check for plugged heater core or hose(s). Check for a damaged cylinder head gasket.
The radiator fan does not run at allRadiator fan circuit troubleshooting (see RADIATOR FAN CIRCUIT TROUBLESHOOTING ).Cleanliness and tightness of all connectors
The radiator fan does not run for engine cooling, but it runs with the A/C onRadiator fan switch circuit troubleshooting (Open) (see RADIATOR FAN SWITCH 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 199°F (93°C)Radiator fan switch circuit troubleshooting (Short) (see RADIATOR FAN SWITCH CIRCUIT TROUBLESHOOTING (SHORT) ).Cleanliness and tightness of all connectors
The A/C condenser fan does not run at all (but the radiator fan runs with the A/C on)A/C condenser fan circuit troubleshooting (see A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING ).HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). Cleanliness and tightness of all connectors
Both the radiator fan and the A/C condenser fan do not run with the A/C on (but the A/C compressor runs with the A/C on)Radiator and A/C condenser fan common circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN COMMON CIRCUIT TROUBLESHOOTING ).HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). Cleanliness and tightness of all connectors

SYMPTOM TROUBLESHOOTING CHART - 04-05 MODELS

'06-08 models

SymptomDiagnostic procedureAlso check for
Engine overheatsCheck the coolant level. Check for coolant leakage (from gaskets, hoses, O-rings, etc.). Check for dirt, leaves, or insects oh radiator and A/C condenser. Check for deteriorated coolant. Check for damaged or deformed fan shrouds. 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 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.
The radiator fan does not run at allCheck for PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). Radiator fan circuit troubleshooting (see RADIATOR FAN CIRCUIT TROUBLESHOOTING ).Cleanliness and tightness of all connectors
Both the radiator fan and the A/C condenser fan run with the ignition switch ON (II), the A/C off, and the engine coolant temperature below 199°F (93°C)Remove the radiator fan relay, and test. If the relay is faulty, replace it. If the relay is OK, repair a short in the wire between radiator fan relay 4P socket terminal No. 4 and ECM/PCM connector terminal E12.Cleanliness and tightness of all connectors
The A/C condenser fan does not run at all (but the radiator fan runs with the A/C on)A/C condenser fan circuit troubleshooting (see A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING ).HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Cleanliness and tightness of all connectors
Both the radiator fan and the A/C condenser fan do not run with the A/C on (but the A/C compressor runs with the A/C on)Radiator and A/C condenser fan common circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN COMMON CIRCUIT TROUBLESHOOTING ).HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Cleanliness and tightness of all connectors
The A/C compressor clutch does not engage (but both the radiator fan and the A/C condenser fan run with the A/C on)A/C compressor clutch circuit troubleshooting (see A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING ).HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Cleanliness and tightness of all connectors

SYMPTOM TROUBLESHOOTING CHART - 06-08 MODELS

Scheme 2

Scheme 2: Circuit Diagram
Scheme 2: Circuit Diagram

'04-05 models

Note. Before beginning this troubleshooting procedure, refer to the SYMPTOM TROUBLESHOOTING INDEX .

Scheme 3

Scheme 3: '04-05 models
Scheme 3: '04-05 models

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9
Scheme 9
  1. Check the No. 11 (20 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the under-dash fuse/relay box. Are the fuses OK? YES - Go to step 2. NO - Replace the f use(s) and recheck.
  2. Remove the radiator fan relay from the under-hood fuse/relay box, and test it (see «POWER RELAY TEST»(/acura/tsx/i-2003-2008/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 radiator fan relay 4P socket terminal No. 2 and body ground. Is there battery voltage? YES - Go to step 4. NO - Replace the under-hood fuse/relay box.
  4. Connect radiator fan relay 4P socket terminal No. 1 and No. 2 with a jumper wire. Does the radiator fan run? YES - Go to step 5. NO - Go to step 6 .
  5. Disconnect the jumper, and turn the ignition switch ON (II). Check for voltage between radiator fan relay 4P socket terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 9 . NO - Repair open in the wire between the under-hood fuse/relay box and under-dash fuse/relay box.
  6. Disconnect the radiator fan motor 2P connector.
  7. Check for continuity between radiator fan relay 4P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 2. Is there continuity? YES - Go to step 8. NO - Repair open in the wire between the under-hood fuse/relay box and radiator fan motor 2P connector terminal No. 2.
  8. Check for continuity between radiator fan motor 2P connector terminal No. 1 and body ground. Is there continuity? YES - Replace the radiator fan motor (see «RADIATOR AND FAN REPLACEMENT»(/acura/tsx/i-2003-2008/remont/cooling-system-mechanical/#cooling-system) ). NO -Repair open in the wire between radiator fan motor 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.
  9. Reinstall the radiator fan relay.
  10. Disconnect the radiator fan switch 2P connector.
  11. Connect radiator fan switch 2P connector terminal No. 1 and No. 2 with a jumper wire. Does the radiator fan run? YES - Replace the radiator fan switch (see «RADIATOR FAN SWITCH REPLACEMENT»(/acura/tsx/i-2003-2008/remont/cooling-fan/#engine-cooling-fan-controls) ). NO - Go to step 12.
  12. Remove the jumper wire, and measure the voltage between radiator fan switch 2P connector terminal No. 2 and body ground. Is there battery voltage? YES - Repair open in the wire between radiator fan switch 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301. NO - Repair open in the wire between radiator fan switch 2P connector terminal No. 2 and the under-hood fuse/relay box.

'06-08 models

Note. Before beginning this troubleshooting procedure, refer to the SYMPTOM TROUBLESHOOTING INDEX .

Scheme 10

Scheme 10: '06-08 models
Scheme 10: '06-08 models

Scheme 11

Scheme 11
Scheme 11

Scheme 12

Scheme 12
Scheme 12

Scheme 13

Scheme 13
Scheme 13

Scheme 14

Scheme 14
Scheme 14

Scheme 15

Scheme 15
Scheme 15
  1. Check for the PGM-FI DTCs (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/i-2003-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
  2. Check the No. 11 (20 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the under-dash fuse/relay box. Are the fuses OK? YES - Go to step 3. NO - Replace the fuse(s) and recheck.
  3. Remove the radiator fan relay from the under-hood fuse/relay box, and test it (see «POWER RELAY TEST»(/acura/tsx/i-2003-2008/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES - Go to step 4. NO - Replace the radiator fan relay.
  4. Measure the voltage between radiator fan relay 4P socket terminal No. 2 and body ground. Is there battery voltage? YES - Go to step 5. NO - Replace the under-hood fuse/relay box.
  5. Connect radiator fan relay 4P socket terminal No. 1 and No. 2 with a jumper wire. Does the radiator fan run? YES - Go to step 6. NO - Go to step 7 .
  6. Disconnect the jumper, and turn the ignition switch ON (II). Check for voltage between radiator fan relay 4P socket terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 10 . NO - Repair open in the wire between the under-hood fuse/relay box and under-dash fuse/relay box.
  7. Disconnect the radiator fan motor 2P connector.
  8. Check for continuity between radiator fan relay 4P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 2. Is there continuity? YES - Go to step 9. NO - Repair open in the wire between the under-hood fuse/relay box and radiator fan motor 2P connector terminal No. 2.a
  9. Check for continuity between radiator fan motor 2P connector terminal No. 1 and body ground. Is there continuity? YES - Replace the radiator fan motor (see «RADIATOR AND FAN REPLACEMENT»(/acura/tsx/i-2003-2008/remont/cooling-system-mechanical/#cooling-system) ). NO - Repair open in the wire between radiator fan motor 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.
  10. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on «HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM)»(/acura/tsx/i-2003-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__how-to-use-the-hds-honda) ).
  11. Turn the ignition switch ON (II).
  12. '07-08 models: Make sure the HDS communicates with the vehicle and the engine control module (ECM)/power train control module (PCM). If it doesn't communicate, troubleshoot the DLC circuit (see «'07-08 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ).
  13. Jump the SCS line with the HDS, then turn the ignition switch OFF. NOTE: This step must be done to protect the ECM/PCM from damage.
  14. Disconnect ECM/PCM connector E (31P).
  15. Disconnect under-hood fuse/relay box connector E (16P).
  16. Check for continuity between ECM/PCM connector terminal E12 and under-hood fuse/relay box terminal E14. Is there continuity? YES - Circuit is OK. Update the ECM/PCM if it does not have the latest software (see «UPDATING THE ECM/PCM»(/acura/tsx/i-2003-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-ecmpcm) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/i-2003-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. if the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). NO - Repair open in the wire between the under-hood fuse/relay box and the ECM/PCM.

Note. Before beginning this troubleshooting procedure, refer to the SYMPTOM TROUBLESHOOTING INDEX .

Scheme 16

Scheme 16: '04-05 models
Scheme 16: '04-05 models

Scheme 17

Scheme 17
Scheme 17
  1. Disconnect the radiator fan switch 2P connector.
  2. Turn the ignition switch ON (II).
  3. Measure voltage between radiator fan switch 2P connector terminal No. 2 and body ground. Is there battery voltage? YES - Go to step 4. NO - Repair open in the wire between radiator fan switch 2P connector terminal No. 2 and under-hood fuse/relay box.
  4. Turn the ignition switch OFF, and check for continuity between radiator fan switch 2P connector terminal No. 1 and body ground. Is there continuity? YES - Replace the radiator fan switch (see «RADIATOR FAN SWITCH REPLACEMENT»(/acura/tsx/i-2003-2008/remont/cooling-fan/#engine-cooling-fan-controls) ). NO - Repair open in the wire between radiator fan switch 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.

Note. Before beginning this troubleshooting procedure, refer to the SYMPTOM TROUBLESHOOTING INDEX .

Scheme 18

Scheme 18: '04-05 models
Scheme 18: '04-05 models
  1. Remove the radiator fan relay from the under-hood fuse/relay box, and test it (see «POWER RELAY TEST»(/acura/tsx/i-2003-2008/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES - Go to step 2. NO - Replace the radiator fan relay.
  2. Remove the radiator fan switch, and test it (see «RADIATOR FAN SWITCH TEST»(/acura/tsx/i-2003-2008/remont/cooling-fan/#engine-cooling-fan-controls) ). Is the radiator fan switch OK? YES - Go to step 3. NO - Replace the radiator fan switch (see «RADIATOR FAN SWITCH REPLACEMENT»(/acura/tsx/i-2003-2008/remont/cooling-fan/#engine-cooling-fan-controls) ).
  3. Disconnect the under-hood fuse relay box 20P connector.
  4. Check for continuity between radiator fan switch 2P connector terminal No. 2 and body ground. Is there continuity? YES - Repair short in the wire between radiator fan switch 2P connector terminal No. 2 and under-hood fuse/relay box. NO - Replace the under-hood fuse/relay box.

Note. Bleed air from the cooling system after installing the radiator fan switch (see COOLANT REPLACEMENT ).

Scheme 19

Scheme 19: '04-05 models
Scheme 19: '04-05 models

Scheme 20

Scheme 20
Scheme 20
  1. Remove the radiator fan switch from the radiator (see «RADIATOR FAN SWITCH REPLACEMENT»(/acura/tsx/i-2003-2008/remont/cooling-fan/#engine-cooling-fan-controls) ).
  2. Suspend the radiator fan switch (A) in a container of water as shown.
  3. Heat the water, and check the temperature with a thermometer. Do not let the thermometer (B) touch the bottom of the hot container.
  4. Measure the continuity between terminal No. 1 and terminal No. 2 according to (Scheme 20).

Scheme 21

Scheme 21: '04-05 models
Scheme 21: '04-05 models
  1. Drain the engine coolant (see «COOLANT REPLACEMENT»(/acura/tsx/i-2003-2008/remont/cooling-system-mechanical/#cooling-system) ).
  2. Remove the splash shield (see step 26 on «TRANSMISSION REMOVAL»(/acura/tsx/i-2003-2008/remont/manual-trans/#manual-transmission__transmission-removal) ).
  3. Disconnect the radiator fan switch connector (A), then remove the radiator fan switch (B).
  4. Install the radiator fan switch with a new O-ring (C).
  5. Refill the radiator with engine coolant, and bleed air from the cooling system with the heater valve open (see «COOLANT REPLACEMENT»(/acura/tsx/i-2003-2008/remont/cooling-system-mechanical/#cooling-system) ).