Intake Air System Acura TSX I

Scheme 1

Carbon Accumulation Check

Note. If the malfunction indicator lamp (MIL) has been reported on, check for diagnostic trouble codes (DTCs).

Scheme 2

1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch ON (II).
3. 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) ).
4. 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.
5. Check REL TP SENSOR in the DATA LIST with the HDS. The reading should be below 2.46 deg. If it is not, clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system__throttle-body-cleaning) ).

Throttle Position Learning Check

Note. If the malfunction indicator lamp (MIL) has been reported on, check for diagnostic trouble codes (DTCs).

Scheme 3

1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch ON (II).
3. 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) ).
4. Select the INSPECTION MENU with the HDS.
5. Do the TP POSITION CHECK in the ETCS TEST. If needed, clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system__throttle-body-cleaning) ).

Throttle Body Cleaning

Scheme 4

1. Check for damage to the air cleaner. If the air cleaner is damaged, replace it (see «AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system) ).
2. Remove the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
3. Clean off the carbon from the throttle valve and inside the throttle body with a paper towel soaked in throttle plate and induction cleaner. NOTE: Remove the throttle body to clean it. Be careful not to pinch your fingers. To avoid removing the molybdenum coating, do not clean the bearing area of the throttle shaft (A). Do not spray throttle plate and induction cleaner directly on the throttle body. Use Honda genuine throttle plate and induction cleaner.
4. Install the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
5. Reset the ECM/PCM with the HDS.
6. Turn the ignition switch ON (II), and wait 2 seconds.
7. 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) ).

Intake Air Bypass Control Thermal Valve Test

Special Tools Required

Vacuum pump/gauge, 0-30 in.Hg, Snap-on YA4000A or equivalent, commercially available

Scheme 5

1. Start the engine, and let it idle. NOTE: The engine coolant temperature must be below 131°F (55°C).
2. Remove the vacuum hose (A) from the intake air duct, and connect a vacuum pump/gauge, 0-30 in.Hg, to the hose.
3. Raise and lower the engine speed; the vacuum gauge reading should change as the engine speed changes. If the vacuum reading does not change, check for these problems: Misrouted, leaking, broken, or clogged intake air bypass control system vacuum lines. A cracked or damaged intake air bypass control thermal valve. Replace the valve if needed (see «INTAKE AIR BYPASS CONTROL THERMAL VALVE REPLACEMENT»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system) ).
4. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
5. Raise and lower the engine speed, and make sure the vacuum gauge reading does not change as the rpm changes. If there is a vacuum reading, check for these problems: Misrouted, leaking, broken, or clogged intake air bypass control system vacuum lines. A cracked or damaged intake air bypass control thermal valve. Replace the valve if needed (see «INTAKE AIR BYPASS CONTROL THERMAL VALVE REPLACEMENT»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system) ).

Scheme 6

1. Remove the bolts (A) and clamp (B).
2. Remove the air cleaner (C).
3. Install the parts in the reverse order of removal.

Scheme 7

1. Remove the air cleaner bolts (A) and the air cleaner housing cover (B).
2. Remove the air cleaner element (C) from the air cleaner housing (D).
3. Check the air cleaner element for damage or clogging. If it is damage or clogging, replace it. NOTE: Do not use compressed air to clean the air cleaner element.
4. Clean and remove any debris from inside the air cleaner housing.
5. Install the parts in the reverse order of removal.
6. Reset the maintenance minder, if needed (see «RESETTING THE MAINTENANCE INFORMATION DISPLAY»(/acura/tsx/i-2003-2008/remont/reset-procedures/#maintenance) ).

Scheme 8

1. Remove the front bumper (see «FRONT BUMPER REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/exterior-body-panels/#bumper-system) ).
2. Remove the intake air cover (A), then remove the intake air duct (B).
3. Remove the resonator (C).
4. Install the parts in the reverse order of removal.

Scheme 9

Scheme 10

1. Remove the throttle cable cover (A).
2. Check cable free play at the throttle linkage. Cable free play (A) should be 0.59-0.71 in. (15-18 mm).
3. If the free play is not within spec (0.59-0.71 in., 15-18 mm), loosen the locknut (B), turn the adjusting nut (C) until the deflection is as specified, then retighten the locknut.
4. With the cable properly adjusted, check the throttle link to be sure it opens fully when you push the accelerator pedal to the floor. Also check the throttle link to be sure it returns whenever you release the accelerator pedal.

Scheme 11

Scheme 12

Scheme 13

1. Remove the throttle cable cover (see «THROTTLE CABLE ADJUSTMENT»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system) ).
2. Fully open the throttle link, then remove the throttle cable (A) from the throttle link (B).
3. Remove the cable housing (C) from the cable bracket (D).
4. Remove the throttle cable (A) from the accelerator pedal (B).
5. Install the parts in the reverse order of removal.
6. Hold the cable, removing all slack from it.
7. Set the cable on the bracket (A). Turn the adjusting nut (B) so that its free play is 0 mm.
8. Position the adjusting nut on the other side of the bracket, then tighten the locknut (C).
9. Check the throttle cable free play (see «THROTTLE CABLE ADJUSTMENT»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system) ).
10. With the cable properly adjusted, check the throttle link to be sure it opens fully when you push the accelerator pedal to the floor. Also check the throttle link to be sure it returns whenever you release the accelerator pedal.

Scheme 14

Scheme 15

1. Remove the engine cover; '04-05 models (see «REMOVAL ('04-05 MODELS)»(/acura/tsx/i-2003-2008/remont/exhaust/#intake-manifold-and-exhaust-system) ), '06-08 models (see «REMOVAL ('06-08 MODELS)»(/acura/tsx/i-2003-2008/remont/exhaust/#intake-manifold-and-exhaust-system) ).
2. Remove the throttle cable bracket.
3. Disconnect the hoses (A). '04-05 models '06-08 models
4. Remove the intake air bypass control thermal valve (B).
5. Install the parts in the reverse order of removal. NOTE: Position the valve angle as shown. '06-08 models: Make sure the center of clamp (C) and the lever end of clamp (D) are the position within the range shown.

Throttle Body Removal/Installation

Note. If you are replacing the throttle body, begin from step 1 . If you are removing the throttle body, skip step 1 to 3 , and begin from step 4 .

Scheme 16

1. Connect the HDS while the engine is stopped.
2. Select the INSPECTION MENU with the HDS.
3. Do the TP POSITION CHECK in the ETCS TEST.
4. Turn the ignition switch OFF.
5. Disconnect the IAT sensor 2P connector (A), and remove the intake air duct (B).
6. Disconnect the throttle body 6P connector (C).
7. Disconnect the water bypass hoses (D), and plug them.
8. Disconnect the vacuum hose (E).
9. Remove the harness clip (F) and the throttle body (G).
10. Install the parts in the reverse order of removal with a new gasket (H), then do this: 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) ). Refill the radiator with engine coolant; '04-05 models (see «'04-05 MODELS»(/acura/tsx/i-2003-2008/remont/cooling-system-mechanical/#cooling-system) ), '06-08 models (see «'06-08 MODELS»(/acura/tsx/i-2003-2008/remont/cooling-system-mechanical/#cooling-system) ).

Scheme 17

Scheme 18

1. Remove the throttle cable from the accelerator pedal (see «THROTTLE CABLE REMOVAL/INSTALLATION»(/acura/tsx/i-2003-2008/remont/mechanical/#intake-air-system) ).
2. Remove the accelerator pedal bracket (A).
3. Install the parts in the reverse order of removal.

See also:
• '04-06 MODELS
• ECM/PCM IDLE LEARN PROCEDURE
• RESETTING THE MAINTENANCE INFORMATION DISPLAY
• FRONT BUMPER REMOVAL/INSTALLATION
• REMOVAL ('04-05 MODELS)
• '04-05 MODELS
• THROTTLE BODY CLEANING
• AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT
• THROTTLE BODY REMOVAL/INSTALLATION