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Idle Control System Acura TSX I

Engine Control Systems 15 illustrations ~3444 words

Scheme 1

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

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Check under these DATA LIST parameter conditions with the HDS: ECT SENSOR ('04-05 models), ECT SENSOR 1 ('06-08 models) above 158°F (70°C) IAT SENSOR above 32°F (0°C) Vehicle speed is 0 mph (0 km/h) ST FUEL TRIM between 0.69 and 1.47 FSS is CLOSED
  5. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 6. NO -If the screen indicates PASSED, go to step 15 . If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 4 and recheck.
  6. Remove the intake air duct from the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
  7. Check for dirt, carbon, or damage in the throttle bore. Is there dirt, carbon, or damage in the throttle bore? YES -If there is dirt or carbon, clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system__throttle-body-cleaning) ). Also check for damage at the air cleaner element (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system) ), then go to step 9 . If there is damage in the throttle bore, go to step 8. NO -Check the A/C system or power steering system, then go to step 17 .
  8. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
  9. Reset the ECM/PCM with the HDS.
  10. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/i-2003-2008/remont/engine-control-systems/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  11. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  12. Check under these DATA LIST parameter conditions with the HDS: ECT SENSOR ('04-05 models), ECT SENSOR 1 ('06-08 models) above 158°F (70°C) IAT SENSOR above 32°F (0°C) Vehicle speed is 0 mph (0 km/h) ST FUEL TRIM between 0.69 and 1.47 FSS is CLOSED
  13. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0506 indicated? YES -Go to step 19 . NO -Go to step 14.
  14. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 13 , go to the indicated DTCs troubleshooting. NO -If the screen indicates FAILED, go to step 19 . If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 12 and recheck.
  15. Remove the intake air duct from the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
  16. Check for dirt, carbon, or damage in the throttle bore. Is there dirt, carbon, or damage in the throttle bore? YES -If there is dirt or carbon, clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system__throttle-body-cleaning) ). Also check for damage to the air cleaner element (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system) ), then go to step 9 . If there is damage in the throttle bore, go to step 8 . NO -Go to step 17.
  17. Recheck with different load conditions (turn on the headlights, blower motor, rear window defogger and/or A/C, change the gear position, etc.).
  18. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Intermittent failure, the system is OK at this time. NO -If the screen indicates FAILED, check the A/C system and/or power steering system, then go to step 1 and recheck. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 17 .
  19. 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) ).
  20. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  21. Check under these DATA LIST parameter conditions with the HDS: ECT SENSOR ('04-05 models), ECT SENSOR 1 ('06-08 models) above 156°F (70°C) IAT SENSOR above 32°F (0°C) Vehicle speed is 0 mph (0 km/h) ST FUEL TRIM between 0.69-1.47 FSS is CLOSED
  22. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0506 indicated? YES -Check for poor connections or loose terminals at the throttle body and the ECM/PCM. If the ECM/PCM was updated, 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 go to step 20 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 23.
  23. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM; '04-05 models (see «'04-05 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ), '06-08 model (see «'06-08 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ). If any other Temporary DTCs or DTCs were indicated in step 22 , go to the indicated DTCs troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the throttle body and the ECM/PCM. If the ECM/PCM was updated, 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 go to step 20 . If the ECM/PCM was substituted, go to step 1 . If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 20 .

Note. Before you troubleshoot, record ail freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Monitor the OBD STATUS for DTC P0507 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 5. NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, recheck with different load conditions (turn on the headlights, blower motor, or A/C; change the gear position, etc.), then go to step 3 .
  5. Check for vacuum leaks at these parts: PCV valve PCV hose EVAP canister purge valve Throttle body Intake manifold Brake booster Brake booster hose Are there any leaks? YES -Repair or replace the faulty parts, then go to step 6. NO -Go to step 6.
  6. Turn the ignition switch ON (II).
  7. Reset the ECM/PCM with the HDS.
  8. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/i-2003-2008/remont/engine-control-systems/#idle-control-system__ecmpcm-idle-learn-procedure) ).
  9. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  10. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0507 indicated? YES -Go to step 12 . NO -Go to step 11.
  11. Monitor the OBD STATUS for DTC P0507 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 10 , go to the indicated DTCs troubleshooting. NO -If the screen indicates FAILED, go to step 12. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, recheck with different load conditions (turn on the headlights, blower motor, or A/C; change the gear position, etc.), then go to step 9 .
  12. 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) ).
  13. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  14. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0507 indicated? YES -Check for poor connections or loose terminals at the throttle body and the ECM/PCM. If the ECM/PCM was updated, 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 go to step 13 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 15.
  15. Monitor the OBD STATUS for DTC P0507 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM; '04-05 models (see «'04-05 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ), '06-08 models (see «'06-08 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ). If any other Temporary DTCs or DTCs were indicated in step 14 , go to the indicated DTCs troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the throttle body and the ECM/PCM. If the ECM/PCM was updated, 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 go to step 13 . If the ECM/PCM was substituted, go to step 1 . If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 13 .

Scheme 2

Scheme 2: A/C Signal Circuit Troubleshooting
Scheme 2: A/C Signal Circuit Troubleshooting
  1. Start the engine.
  2. Turn the blower switch on.
  3. Turn the A/C switch on.
  4. Check the A/C CLUTCH in the DATA LIST with the HDS. Is it ON? YES -Go to step 5. NO -Go to the A/C pressure switch circuit troubleshooting (see «A/C PRESSURE SWITCH AND THERMAL PROTECTER CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/automatic-hvac-system/#automatic-hvac-system) ).
  5. Check the A/C system. Does the A/C system operate? YES -The air conditioning system circuit is OK. NO -Go to step 6.
  6. Turn the ignition switch OFF.
  7. Turn the ignition switch ON (II).
  8. Activate the A/C CLUTCH in the INSPECTION MENU with the HDS. Is there a clicking noise from the A/C compressor clutch? YES -Do the A/C system test (see «A/C SYSTEM TEST»(/acura/tsx/i-2003-2008/remont/automatic-hvac-system/#automatic-hvac-system) ). NO -Go to step 9.
  9. Momentarily connect under-hood fuse/relay box 16P connector terminal No. 15 to body ground with a jumper wire several times. Is there a clicking noise from the A/C compressor clutch? YES -Repair open in the wire between the ECM/PCM (E18) and the A/C clutch relay. NO -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; '04-05 models (see «'04-05 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ), '06-08 models (see «'06-08 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ).

Scheme 3

Scheme 3: '04 model
Scheme 3: '04 model

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6
  1. Start the engine, and let it idle.
  2. Monitor the ALTERNATOR in the DATA LIST with the HDS.
  3. Check if the indicated percentage varies when the headlight switch is on. Does the percentage vary? YES -The alternator signal circuit is OK. NO -Go to step 4.
  4. Turn the headlight switch and ignition switch OFF.
  5. Disconnect the alternator 4P connector.
  6. Turn the ignition switch ON (II).
  7. Measure voltage between ECM/PCM connector terminals A9 and B13. Is there about 5 V? YES -Go to step 8. NO -Go to step 13 .
  8. Turn the ignition switch OFF.
  9. Jump the SCS line with the HDS.
  10. Disconnect ECM/PCM connector B (24P).
  11. Connect alternator 4P connector terminal No. 4 to body ground with a jumper wire.
  12. Check for continuity between body ground and ECM/PCM connector terminal B13. Is there continuity? YES -Test the alternator (see «ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/i-2003-2008/remont/charging-system/#charging-system) ). NO -Repair open in the wire between the ECM/PCM (B13) and the alternator.
  13. Turn the ignition switch OFF.
  14. Jump the SCS line with the HDS.
  15. Disconnect ECM/PCM connector B(24P).
  16. Check for continuity between body ground and ECM/PCM connector terminal B13. Is there continuity? YES -Repair short in the wire between the ECM/PCM (B13) and the alternator. NO -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) ).

Scheme 7

Scheme 7: '05-08 models
Scheme 7: '05-08 models
  1. Start the engine, and let it idle.
  2. Monitor the ALTERNATOR in the DATA LIST with the HDS.
  3. Check if the indicated percentage varies when the headlight switch is on. Does the percentage vary? YES -The alternator signal circuit is OK. NO -Go to step 4.
  4. Turn the headlight switch and ignition switch OFF.
  5. Jump the SCS line with the HDS.
  6. Disconnect the alternator 4P connector.
  7. Disconnect ECM/PCM connector B (24P).
  8. Check for continuity between body ground and ECM/PCM connector terminal B13. Is there continuity? YES -Repair short in the wire between the ECM/PCM (B13) and the alternator. NO -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; '05 model (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/i-2003-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) «'04-05 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ), '06-08 models (see «'06-08 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ).

PSP Switch Signal Circuit Troubleshooting

Note. Information marked with an asterisk (*) applies to '06-08 models.

Scheme 8

Scheme 8: PSP Switch Signal Circuit Troubleshooting
Scheme 8: PSP Switch Signal Circuit Troubleshooting

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10
Scheme 10

Scheme 11

Scheme 11
Scheme 11

Scheme 12

Scheme 12
Scheme 12
  1. Start the engine, and let it idle.
  2. Align the steering wheel straight ahead.
  3. Check the PSP SWITCH in the DATA LIST with the HDS. Does it indicate ON? YES -Go to step 4. NO -Go to step 14 .
  4. Turn the steering wheel to the full lock position.
  5. Check the PSP SWITCH in the DATA LIST with the HDS. Does it change to OFF? YES -The PSP switch signal circuit is OK. NO -Go to step 6.
  6. Turn the ignition switch OFF.
  7. Disconnect the PSP switch 2P connector.
  8. Start the engine.
  9. Check the PSP SWITCH in the DATA LIST with the HDS. Does it change to OFF? YES -Replace the PSP switch (see «POWER STEERING HOSE, LINE, AND PRESSURE SWITCH REPLACEMENT»(/acura/tsx/i-2003-2008/remont/manual-power-steering/#power-steering-system__power-steering-hose-line-and-pressure) ). NO -Go to step 10.
  10. Turn the ignition switch OFF.
  11. Jump the SCS line with the HDS.
  12. Disconnect ECM/PCM connector E (31P).
  13. Check for continuity between PSP switch 2P connector terminal No. 1 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/PCM (E16) and the PSP switch. NO -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; '04-05 models (see «'04-05 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ), '06-08 models (see «'06-08 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ).
  14. Turn the ignition switch OFF.
  15. Disconnect the PSP switch 2P connector.
  16. Connect PSP switch 2P connector terminals No. 1 and No. 2 with a jumper wire, then start the engine.
  17. Check the PSP SWITCH in the DATA LIST with the HDS. Does it change to ON? YES -Replace the PSP switch (see «POWER STEERING HOSE, LINE, AND PRESSURE SWITCH REPLACEMENT»(/acura/tsx/i-2003-2008/remont/manual-power-steering/#power-steering-system__power-steering-hose-line-and-pressure) ). NO -Go to step 18.
  18. Turn the ignition switch OFF.
  19. Remove the jumper wire from the PSP switch 2P connector.
  20. Jump the SCS line with the HDS.
  21. Disconnect ECM/PCM connector E (31P).
  22. Connect PSP switch 2P connector terminal No. 1 to body ground with a jumper wire.
  23. Check for continuity between body ground and ECM/PCM connector terminal E16. Is there continuity? YES -Go to step 24. NO -Repair open in the wire between the PSP switch and the ECM/PCM (E16).
  24. Check for continuity between PSP switch 2P connector terminal No. 2 and body ground. Is there continuity? YES -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; '04-05 models (see «'04-05 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ), '06-08 models (see «'06-08 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ). NO -Repair open in the wire between the PSP switch and G202.

Scheme 13

Scheme 13: Brake Pedal Position Switch Signal Circuit Troubleshooting
Scheme 13: Brake Pedal Position Switch Signal Circuit Troubleshooting

Scheme 14

Scheme 14
Scheme 14
  1. Turn the ignition switch ON (II).
  2. Check the BRAKE SWITCH in the DATA LIST with the HDS. Does it indicate OFF? YES -Go to step 3. NO -Inspect the brake pedal position switch (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/tsx/i-2003-2008/remont/mechanical-hydraulic/#conventional-brake-components) ).
  3. Press the brake pedal, and check the BRAKE SWITCH in the DATA LIST with the HDS. Does it change to ON? YES -The brake pedal position switch signal circuit (BKSW line) is OK. NO -Go to step 4.
  4. Turn the ignition switch OFF.
  5. Jump the SCS line with the HDS.
  6. Disconnect the brake pedal position switch 4P connector.
  7. Disconnect ECM/PCM connector E (31P).
  8. Check for continuity between ECM/PCM connector terminal E22 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/PCM (E22) and the No. 13 HORN, STOP (20 A) fuse. Replace the No. 13 HORN, STOP (20 A) fuse. NO -Go to step 9.
  9. Check for continuity between ECM/PCM connector terminal E22 and brake pedal position switch 4P connector terminal No. 2. Is there continuity? YES -Repair open in the wire between the brake pedal position switch and the No. 13 HORN, STOP (20 A) fuse. Inspect the brake pedal position switch (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(/acura/tsx/i-2003-2008/remont/mechanical-hydraulic/#conventional-brake-components) ). NO -Repair open in the wire between the ECM/PCM (E22) and the brake pedal position switch.

Idle Speed Inspection

Note. Before checking the idle speed, check these items: -The malfunction indicator lamp (MIL) has not been reported on. Ignition timing - Sparkplugs - Air cleaner PCV system Apply the parking brake, and make sure the headlights are off.

Scheme 15

Scheme 15: Idle Speed Inspection
Scheme 15: Idle Speed Inspection
  1. Disconnect the evaporative emission (EVAP) canister purge valve connector.
  2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
  3. Turn the ignition switch ON (II).
  4. Make sure the HDS communicates with the ECM/PCM. If it doesn't go to the DLC circuit troubleshooting; '04-06 models (see «'04-06 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ), '07-08 models (see «'07-08 MODELS»(/acura/tsx/i-2003-2008/remont/testing-diagnostics/#pgm-fi-system) ).
  5. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  6. Check the idle speed without load conditions: headlights, blower fan, radiator fan, and air conditioner off. Idle speed should be: '04-05 models IDLE SPEED REFERENCE - 04-05 MODELS M/T 750 ± 50 rpm A/T 800 ± 50 rpm (in Park or neutral) '06-08 models IDLE SPEED REFERENCE - 06-08 MODELS M/T 780 ± 50 rpm A/T 800 ± 50 rpm (in Park or neutral)
  7. Let the engine idle for 1 minute with high electric load (A/C switch on, temperature set to max cool, blower fan on High, rear window defogger on, and headlights on high beam). Idle speed should be: '04-05 models IDLE SPEED REFERENCE - 04-05 MODELS M/T 750 ± 50 rpm A/T 800 ± 50 rpm (in Park or neutral) '06-08 models IDLE SPEED REFERENCE - 06-08 MODELS M/T 780 ± 50 rpm A/T 800 ± 50 rpm (in Park or neutral) NOTE: If the idle speed is not within specification, do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/i-2003-2008/remont/engine-control-systems/#idle-control-system__ecmpcm-idle-learn-procedure) ). If the idle is still not within specification, go to the symptom troubleshooting.
  8. Reconnect the EVAP canister purge valve connector.

ECM/PCM Idle Learn Procedure

The idle learn procedure must be done so the ECM/PCM can learn the engine idle characteristics.

Do the idle learn procedure whenever you do any of these actions

  1. Replace the ECM/PCM.
  2. Reset the ECM/PCM.
  3. Update the ECM/PCM.
  4. Replace or clean the throttle body.

Note. Clearing the DTCs with the HDS does not require you to do the idle learn procedure.

Procedure

  1. Make sure all electrical items (A/C, audio, lights, etc.) are off.
  2. Reset the ECM/PCM with the HDS.
  3. Turn the ignition switch ON (II), and wait 2 seconds.
  4. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, or until the engine coolant temperature reaches 194°F (90°C).
  5. Let the engine idle for about 5 minutes with the throttle fully closed. NOTE: If the radiator fan comes on, do not include its running time in the 5 minutes.

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