Acura TSX / Honda Accord CL. Manual — part 580

1. Disconnect the IAT sensor connector (A).

Fig. 14: Removing Throttle Body

CAUTION: Do not insert your fingers into the installed throttle body when you turn

the ignition switch ON (II) or while the ignition switch is ON (II). If you do,
there will be serious injury to your fingers if the throttle valve is activated.

2004 Acura TSX

2004 ENGINE PERFORMANCE Intake Air System - TSX

2. Remove the intake air duct (B).

3. Disconnect the throttle body connector (C).

4. Disconnect the water bypass hoses (D), and plug the water bypass hoses.

5. Disconnect the vacuum hose (E).

6. Remove the harness clip (F) and the throttle body (G).

7. Install the parts in the reverse order of removal with a new gasket (H), then check these items:

z

Do the ECM/PCM idle learn procedure after the throttle body has been replaced (see ECM/PCM
IDLE LEARN PROCEDURE ).

z

Refill the radiator with engine coolant (see COOLANT REPLACEMENT ), and bleed air from
the cooling system with the heater valve open.

THROTTLE BODY DISASSEMBLY/REASSEMBLY

2004 Acura TSX

2004 ENGINE PERFORMANCE Intake Air System - TSX

Fig. 15: Exploded View Of Throttle Body Components

2004 Acura TSX

2004 ENGINE PERFORMANCE Intake Air System - TSX

2004 ENGINE PERFORMANCE

PCV System - TSX

DTC TROUBLESHOOTING

DTC P2279: INTAKE AIR SYSTEM LEAK DETECTED

1. Check for vacuum leaks at the following parts.

z

PCV valve

z

PCV hose

z

Purge (PCS) line

z

Throttle body

z

Brake booster hose

Are the parts OK?

YES: Go to step 2.

NO: Repair or replace the leaking part(s), then go to step 4 .

2. Start the engine. Hold the engine speed at 3,000 RPM with no load (in Park or neutral) until the radiator

fan comes on, then let it idle for 1 minute.

3. Monitor the OBD STATUS for DTC P2279 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES: Check the camshaft timing (see CAM CHAIN INSTALLATION ), then go to step 4.

NO: If the screen indicates PASSED, intermittent failure, system is OK at this time. If the
screen indicates NOT COMPLETED, go to step 2 and recheck.

4. Reset the ECM/PCM with the HDS.

5. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).

6. Start the engine. Hold the engine speed at 3,000 RPM with no load (in Park or neutral) until the radiator

fan comes on, then let it idle for 1 minute.

7. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES: If DTC P2279 is indicated, check for vacuum leaks at the PCV valve, the PCV hose, the
purge (PCS) line, the throttle body, or the brake booster hose, then go to step 4 . If any other
Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.

NO: Go to step 8.

8. Monitor the OBD STATUS for DTC P2279 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

NOTE:

If DTC P0443 is stored at the same time as DTC P2279, troubleshoot DTC P0443
first, then recheck for DTC P2279.

2004 Acura TSX

2004 ENGINE PERFORMANCE PCV System - TSX

2004 Acura TSX

2004 ENGINE PERFORMANCE PCV System - TSX