Intake Air System — Acura TL IV рестайлинг (2011-2014)

Scheme 20

Scheme 20: Component Location Index

DTC P1077: IMT Valve Stuck in High RPM Position

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

Scheme 21

Scheme 21: DTC P1077: IMT Valve Stuck in High RPM Position

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Scheme 29

Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Clear the DTC with the HDS.
Do the IMT TEST in the INSPECTION MENU with the HDS. Is the result OK? YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the IMT actuator and the ECM/PCM. • NO - Go to step 4.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Disconnect the IMT actuator 5P connector.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Measure the voltage between IMT actuator 5P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 12 . NO - Go to step 8.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Check for continuity between IMT actuator 5P connector terminal No. 1 and ECM/PCM connector terminal C11. Is there continuity? YES - Go to step 36 . NO - Repair open in the wire between the ECM/PCM (C11) and the IMT actuator, then go to step 30 .
Measure the voltage between IMT actuator 5P connector terminal No. 3 and body ground. Is there about 5 V? YES - Go to step 17 . NO - Go to step 13.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between IMT actuator 5P connector terminal No. 3 and ECM/PCM connector terminal B19. Is there continuity? YES - Go to step 36 . NO - Repair open in the wire between the ECM/PCM (B19) and the IMT actuator, then go to step 30 .
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Check for continuity between IMT actuator 5P connector terminal No. 2 and ECM/PCM connector terminal C16. Is there continuity? YES - Go to step 21. NO - Repair open in the wire between the ECM/PCM (C16) and the IMT actuator, then go to step 30 .
Check for continuity between ECM/PCM connector terminal C48 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (C48) and the IMT actuator, then go to step 30 . NO - Go to step 22.
Check for continuity between ECM/PCM connector terminal C49 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (C49) and the IMT actuator, then go to step 30 . NO - Go to step 23.
Check for continuity between IMT actuator 5P connector terminal No. 5 and ECM/PCM connector terminal C48. Is there continuity? YES - Go to step 24. NO - Repair open in the wire between the ECM/PCM (C48) and the IMT actuator, then go to step 30 .
Check for continuity between IMT actuator 5P connector terminal No. 4 and ECM/PCM connector terminal C49. Is there continuity? YES - Go to step 25. NO - Repair open in the wire between the ECM/PCM (C49) and the IMT actuator, then go to step 30 .
Remove the «IMT actuator»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system) .
Move the IMT valve by hand. Does it move smoothly? YES - Go to step 27. NO - Remove the intake manifold upper cover (see step 5 under «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-manifold-and-exhaust-system) ), and repair the stuck valve. If needed, replace the intake manifold (see «REMOVAL»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-manifold-and-exhaust-system) ), then go to step 30 .
Substitute a known-good «IMT actuator»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system) .
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Do the IMT TEST in the INSPECTION MENU with the HDS. Is the result OK? YES - Replace the original «IMT actuator»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system) , then go to step 30. NO - Go to step 36 .
Reconnect all connectors.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P1077 indicated? YES - Check for poor connections or loose terminals at the IMT actuator and the ECM/PCM, then go to step 1 . NO - Go to step 35.
Monitor the OBD STATUS for DTC PI 077 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 34 , go to the indicated DTC's troubleshooting. • NO - If the screen indicates FAILED, check for poor connections or loose terminals at the IMT actuator and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
Reconnect ail connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
Start the engine, and let it idle without load (A/T in P or N, M/T in neutral) until the radiator fan comes on.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P1077 indicated? YES - Check for poor connections or loose terminals at the IMT actuator and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 38 . If the ECM/PCM was substituted, go to step 1 . NO - Go to step 40.
Monitor the OBD STATUS for DTC P1077 in the DTCs MENU with the HDS. Does the screen indicates PASSED? YES - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 39 , go to the indicated DTC's troubleshooting. • NO - If the screen indicated FAILED, check for poor connections or loose terminals at the IMT actuator and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 38 . If the ECM/PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P1078: IMT Valve Stuck in Low RPM Position

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

Scheme 30

Scheme 30: DTC P1078: IMT Valve Stuck in Low RPM Position

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Scheme 34

Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Clear the DTC with the HDS.
Do the IMT TEST in the INSPECTION MENU with the HDS. Is the result OK? YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the IMT actuator and the ECM/PCM. • NO - Go to step 4.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Disconnect the IMT actuator 5P connector.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Check the IMT VALVE SW in the DATA LIST with the HDS. Is CLOSE indicated? YES - Go to step 12 . NO - Go to step 8.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between ECM/PCM connector terminal B19 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B19) and the IMT actuator, then go to step 24 . NO - Go to step 31 .
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Check for continuity between ECM/PCM connector terminal C48 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (C48) and the IMT actuator, then go to step 24 . NO - Go to step 16.
Check for continuity between ECM/PCM connector terminal C49 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (C49) and the IMT actuator, then go to step 24 . NO - Go to step 17.
Check for continuity between IMT actuator 5P connector terminal No. 5 and ECM/PCM connector terminal C48. Is there continuity? YES - Go to step 18. NO - Repair open in the wire between the ECM/PCM (C48) and the IMT actuator, then go to step 24 .
Check for continuity between IMT actuator 5P connector terminal No. 4 and ECM/PCM connector terminal C49. Is there continuity? YES - Go to step 19. NO - Repair open in the wire between the ECM/PCM (C49) and the IMT actuator, then go to step 24 .
Remove the «IMT actuator»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system) .
Move the IMT valve by hand. Does it move smoothly? YES - Go to step 21. NO - Remove the intake manifold upper cover (see step 5 under «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-manifold-and-exhaust-system) ), and repair the stuck valve. If needed, replace the intake manifold (see «REMOVAL»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-manifold-and-exhaust-system) ), then go to step 24 .
Substitute a known-good «IMT actuator»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system) .
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Do the IMT TEST in the INSPECTION MENU with the HDS. Is the result OK? YES - Replace the original «IMT actuator»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system) , then go to step 24. NO - Go to step 32 .
Reconnect all connectors.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
Start the engine, and let it idle without load (A/T in P or N, M/T in neutral) until the radiator fan comes on.
Hold the engine speed at 4, 000 RPM for 3 seconds or more, then let it idle.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P1078 indicated? YES - Check for poor connections or loose terminals at the IMT actuator and the ECM/PCM, then go to step 1 . NO - Go to step 31.
Monitor the OBD STATUS for DTC P1078 in the DTCs MENU with the HDS. Does the screen indicates PASSED? YES - Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 30 , go to the indicated DTC's troubleshooting. • NO - If the screen indicates FAILED, check for poor connections or loose terminals at the IMT actuator and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 28 .
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
Start the engine, and let it idle without load (A/T in P or N, M/T in neutral) until the radiator fan comes on.
Hold the engine speed at 4, 000 RPM for 3 seconds or more, then let it idle.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P1078 indicated? YES - Check for poor connections or loose terminals at the IMT actuator and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 34 . If the ECM/PCM was substituted, go to step 1 . NO - Go to step 37.
Monitor the OBD STATUS for DTC P1078 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 (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 36 , go to the indicated DTC's troubleshooting. • NO - If the screen indicated FAILED, check for poor connections or loose terminals at the IMT actuator and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 34 . If the ECM/PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 34 .

Carbon Accumulation Check

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

Scheme 35

Scheme 35: Carbon Accumulation Check

Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Make sure the HDS communicates with the ECM/PCM. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
Start the engine. Hold the engine speed at 3, 000 RPM without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
Check the REL TP SENSOR in the DATA LIST with the HDS. The reading should be below 2.46 percent. If it is not, clean the «throttle body»(/acura/tl/iv-2011-2014/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 36

Scheme 36: Throttle Position Learning Check

Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Make sure the HDS communicates with the ECM/PCM. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
Select the INSPECTION MENU with the HDS.
Do the TP LEARNING CHECK in the ETCS TEST. If needed, clean the «throttle body»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-cleaning) .

Throttle Body Cleaning

CAUTION

Do not insert your fingers into the installed throttle body when you turn the ignition switch to ON (II)/press the engine start/stop button, or while the ignition switch is in ON (II)/vehicle in ON mode. If you do, you will seriously injure your fingers if the throttle valve is activated.

Scheme 37

Check for damage to the air cleaner element. If the «air cleaner element»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system) is damaged, replace it.
Remove the «throttle body»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) .
Clean off the carbon from the throttle valve and inside the throttle body with a paper towel soaked in throttle plate 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 cleaner directly on the throttle body. Use Acura genuine throttle plate cleaner.
Install the «throttle body»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) .
Reset the ECM/PCM with the HDS (see «HDS CLEAR COMMAND»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__hds-clear-command) ).
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode and wait 2 seconds.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).

Scheme 38

Scheme 38: Air Cleaner Removal/Installation

Do the battery removal procedure (see «BATTERY REMOVAL AND INSTALLATION»(/acura/tl/iv-2011-2014/remont/body-electrical/#battery) ).
Disconnect the MAF sensor/IAT sensor 5P connector (A).
Remove the harness clamps (B) and the bolt (C).
Loosen the band (D), then remove the air cleaner housing (E).
Install the parts in the reverse order of removal. NOTE: J37A4 engine: Before you torque the hose clamp screw (F), align the edge of the clamp (G) within the painted mark (H). J35Z6 engine: After you torque the hose clamp screw (I), make sure the clearance (J) is less than 0.04 in (1.0 mm).
Do the battery installation procedure (see «BATTERY REMOVAL AND INSTALLATION»(/acura/tl/iv-2011-2014/remont/body-electrical/#battery) ).

Scheme 39

Scheme 39: Air Cleaner Element Inspection/Replacement

Open the air cleaner housing cover (A).
Remove the air cleaner element (B) from the air cleaner housing (C).
Check the air cleaner element for damage or clogging. If it is damaged or clogged, replace it. NOTE: Do not use compressed air to clean the air cleaner element.
Clean and remove any debris from inside the air cleaner housing.
Install the parts in the reverse order of removal.

If you did not replace the air cleaner element, this procedure is complete.
If the Maintenance Minder required air cleaner element replacement, reset the Maintenance Minder (see «MAINTENANCE MINDER™»(/acura/tl/iv-2011-2014/remont/schedule/#maintenance) ).
If the idle speed fluctuates, do the idle speed inspection (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).

Scheme 40

Scheme 40: Intake Air Resonator Removal/Installation

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Scheme 44

Remove the splash separator (A).
Do the battery removal procedure (see «BATTERY REMOVAL AND INSTALLATION»(/acura/tl/iv-2011-2014/remont/body-electrical/#battery) ).
Remove the air cleaner (see ).
Remove the battery base (A). A/T M/T
Remove the intake air duct (A).
Remove the front bumper (see «FRONT BUMPER REMOVAL/INSTALLATION»(/acura/tl/iv-2011-2014/remont/exterior-body-panels/#bumpers__front-bumper-removalinstallation) ).
Remove the intake air resonator (A).
J37A4 engine: Remove the brake duct (B).
Install the parts in the reverse order of removal.
Do the battery installation procedure (see «BATTERY REMOVAL AND INSTALLATION»(/acura/tl/iv-2011-2014/remont/body-electrical/#battery) ).

Scheme 45

Scheme 45: IMT Actuator Replacement

Disconnect the IMT actuator 5P connector (A).
Remove the bolts (B) and the IMT actuator (C).
Install the parts in the reverse order of removal with a new O-ring (D).

Throttle Body Removal/Installation