Acura TSX / Honda Accord CL. Manual — part 571

2004 ENGINE PERFORMANCE

Idle Control System - TSX

COMPONENT LOCATION INDEX

Fig. 1: Locating Idle Control System Components

DTC TROUBLESHOOTING

DTC TROUBLESHOOTING INDEX

DTC P0506: IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED

DTC

Description

DTC P0506

Idle Control System RPM Lower Than Expected

DTC P0507

Idle Control System RPM Higher Than Expected

2004 Acura TSX

2004 ENGINE PERFORMANCE Idle Control System - TSX

2004 Acura TSX

2004 ENGINE PERFORMANCE Idle Control System - TSX

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 with no load (in Park or neutral) until the radiator

fan comes on, then let it idle.

4. Check the following data in the DATA LIST with the HDS.

z

Engine coolant temperature more than 70°C (156°F)

z

Intake air temperature more than 0°C (32°F)

z

Vehicle speed is 0 mph (0 km/h)

z

ST FUEL TRIM between 0.73 and 1.47

z

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, let the engine
idle 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.

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 ), and also
check for damage at the air cleaner element (see AIR CLEANER ELEMENT REPLACEMENT ),
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 ).

9. Reset the ECM/PCM with the HDS.

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

11. 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.

12. Check the following data in the DATA LIST with the HDS.

z

Engine coolant temperature more than 70°C (156°F)

z

Intake air temperature more than 0°C (32°F)

z

Vehicle speed is 0 mph (0 km/h)

z

ST FUEL TRIM between 0.73 and 1.47

z

FSS is CLOSED

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

2004 Acura TSX

2004 ENGINE PERFORMANCE Idle Control System - TSX

Are any Temporary DTCs or DTCs indicated?

YES -If DTC P0506 is indicated, go to step 1 and recheck. If any other temporary DTCs or DTCs are
indicated, go to the indicated DTC troubleshooting.

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.

NO -If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates EXECUTING, let
the engine idle 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.

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 ), and also
check for damage at the air cleaner element (see AIR CLEANER ELEMENT REPLACEMENT ),
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, changing 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, 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, let the engine idle until a result comes on. If the
screen indicates Out of CONDITION, go to step 17 and recheck.

DTC P0507: IDLE CONTROL SYSTEM RPM HIGHER THAN EXPECTED

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 with no load (in Park or neutral) until the radiator

fan comes on, then let it idle.

2004 Acura TSX

2004 ENGINE PERFORMANCE Idle Control System - TSX

4. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES -Check for vacuum leaks at the following parts, then go to step 5.

z

PCV valve

z

PCV hose

z

EVAP canister purge valve

z

Throttle body

z

Brake booster hose

NO -If the screen indicates PASSED, intermittent failure, system is OK at this time. If the screen
indicates EXECUTING, let the engine idle until a result comes on. If the screen indicates Out of
CONDITION, recheck with different load conditions (electrical, A/C, gear position, etc.) then, go to step
3.

5. Turn the ignition switch ON (II).

6. Reset the ECM/PCM with the HDS.

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

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

comes on, then let it idle.

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

Are any Temporary DTCs or DTCs indicated?

YES -If DTC P0507 is indicated, check for poor connections or loose terminals at the throttle body,
throttle actuator control module, and the ECM/PCM, then go to step 1. If any other Temporary DTCs or
DTCs are indicated, go to the indicated DTC troubleshooting.

NO -Go to step 10.

10. Monitor the OBD STATUS for DTC P0507 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES -Troubleshooting is complete.

NO -If the screen indicates FAILED, check for poor connections or loose terminals at the throttle body,
throttle actuator control module, and the ECM/PCM, then go to step 1. If the screen indicates
EXECUTING, let the engine idle until a result comes on. If the screen indicates Out of CONDITION,
recheck with different load conditions (electrical, A/C, gear position, etc.) then, go to step 8.

A/C SIGNAL CIRCUIT TROUBLESHOOTING

2004 Acura TSX

2004 ENGINE PERFORMANCE Idle Control System - TSX