Intake Air System Acura MDX II рестайлинг

Scheme 17

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 ).

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Scheme 26

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. 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 PCM. NO -Go to step 4.
4. Turn the ignition switch to LOCK (0).
5. Disconnect the IMT actuator 5P connector.
6. Turn the ignition switch to ON (II).
7. 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.
8. Turn the ignition switch to LOCK (0).
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector C (49P).
11. Check for continuity between IMT actuator 5P connector terminal No. 1 and PCM connector terminal C11. Is there continuity? YES -Go to step 36 . NO -Repair an open in the wire between the PCM (C11) and the IMT actuator, then go to step 30 .
12. 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.
13. Turn the ignition switch to LOCK (0).
14. Jump the SCS line with the HDS.
15. Disconnect PCM connector B (49P).
16. Check for continuity between IMT actuator 5P connector terminal No. 3 and PCM connector terminal B19. Is there continuity? YES -Go to step 36 . NO -Repair an open in the wire between the PCM (B19) and the IMT actuator, then go to step 30 .
17. Turn the ignition switch to LOCK (0).
18. Jump the SCS line with the HDS.
19. Disconnect PCM connector C (49P).
20. Check for continuity between IMT actuator 5P connector terminal No. 2 and PCM connector terminal C16. Is there continuity? YES -Go to step 21. NO -Repair an open in the wire between the PCM (C16) and the IMT actuator, then go to step 30 .
21. Check for continuity between PCM connector terminal C48 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C48) and the IMT actuator, then go to step 30 . NO -Go to step 22.
22. Check for continuity between PCM connector terminal C49 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C49) and the IMT actuator, then go to step 30 . NO -Go to step 23.
23. Check for continuity between IMT actuator 5P connector terminal No. 5 and PCM connector terminal C48. Is there continuity? YES -Go to step 24. NO -Repair an open in the wire between the PCM (C48) and the IMT actuator, then go to step 30 .
24. Check for continuity between IMT actuator 5P connector terminal No. 4 and PCM connector terminal C49. Is there continuity? YES -Go to step 25. NO -Repair an open in the wire between the PCM (C49) and the IMT actuator, then go to step 30 .
25. Remove the IMT actuator (see «IMT ACTUATOR REPLACEMENT»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-air-system) ).
26. Move the IMT valve by hand. Does it move smoothly? YES -Go to step 27. NO -Remove the engine cover (see step 6 under «ENGINE REMOVAL»(/acura/mdx/ii-2010-2013/remont/mechanical/#engine-assembly__engine-removal) ), and repair the stuck valve. If needed, replace the intake manifold (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ), then go to step 30 .
27. Substitute a known-good IMT actuator (see «IMT ACTUATOR REPLACEMENT»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-air-system) ).
28. Turn the ignition switch to ON (II).
29. Do the IMT TEST in the INSPECTION MENU with the HDS. Is the result-OK? YES -Replace the original IMT actuator, then go to step 30. NO -Go to step 36 .
30. Reconnect all connectors.
31. Turn the ignition switch to ON (II).
32. Reset the PCM with the HDS.
33. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
34. 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 PCM, then go to step 1 . NO -Go to step 35.
35. Monitor the OBD STATUS for DTC P1077 in the DTCs MENU with the HDS. Does the HDS 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»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-air-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the IMT actuator and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
36. Reconnect all connectors.
37. Update the PCM if it does not have the latest software (see «KNOCK SENSOR REPLACEMENT»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#pgm-fi-system) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
38. Start the engine, and let it idle without load (in P or N) until the radiator fan comes on.
39. 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 PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 38 . If the PCM was substituted, go to step 1 . NO -Go to step 40.
40. Monitor the OBD STATUS for DTC P1077 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 39 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-air-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the IMT actuator and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 38 . If the PCM was substituted, go to step 1 . If the HDS 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 ).

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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. 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 PCM. NO -Go to step 4.
4. Turn the ignition switch to LOCK (0).
5. Disconnect the IMT actuator 5P connector.
6. Turn the ignition switch to ON (II).
7. 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.
8. Turn the ignition switch to LOCK (0).
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector B (49P).
11. Check for continuity between PCM connector terminal B19 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (B19) and the IMT actuator, then go to step 24 . NO -Go to step 32 .
12. Turn the ignition switch to LOCK(0).
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector C (49P).
15. Check for continuity between PCM connector terminal C48 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C48) and the IMT actuator, then go to step 24 . NO -Go to step 16.
16. Check for continuity between PCM connector terminal C49 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C49) and the IMT actuator, then go to step 24 . NO -Go to step 17.
17. Check for continuity between IMT actuator 5P connector terminal No. 5 and PCM connector terminal C48. Is there continuity? YES -Go to step 18. NO -Repair an open in the wire between the PCM (C48) and the IMT actuator, then go to step 24 .
18. Check for continuity between IMT actuator 5P connector terminal No. 4 and PCM connector terminal C49. Is there continuity? YES -Go to step 19. NO -Repair an open in the wire between the PCM (C49) and the IMT actuator, then go to step 24 .
19. Remove the IMT actuator (see «IMT ACTUATOR REPLACEMENT»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-air-system) ).
20. Move the IMT valve by hand. Does it move smoothly? YES -Go to step 21. NO -Remove the engine cover (see step 6 under «ENGINE REMOVAL»(/acura/mdx/ii-2010-2013/remont/mechanical/#engine-assembly__engine-removal) ), and repair the stuck valve. If needed, replace the intake manifold (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ), then go to step 24 .
21. Substitute a known-good IMT actuator (see «IMT ACTUATOR REPLACEMENT»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-air-system) ).
22. Turn the ignition switch to ON (II).
23. Do the IMT TEST in the INSPECTION MENU with the HDS. Is the result OK? YES -Replace the original IMT actuator (see «IMT ACTUATOR REPLACEMENT»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-air-system) ), then go to step 24. NO -Go to step 32 .
24. Reconnect all connectors.
25. Turn the ignition switch to ON (II).
26. Reset the PCM with the HDS.
27. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
28. Start the engine, and let it idle without load (in P or N) until the radiator fan comes on.
29. Hold the engine speed at 4, 050 rpm for 3 seconds or more, then let it idle.
30. 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 PCM, then go to step 1 . NO -Go to step 31.
31. Monitor the OBD STATUS for DTC PI 078 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 30 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-air-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the IMT actuator and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 28 .
32. Reconnect all connectors.
33. Update the PCM if it does not have the latest software (see «KNOCK SENSOR REPLACEMENT»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#pgm-fi-system) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
34. Start the engine, and let it idle without load (in P or N) until the radiator fan comes on.
35. Hold the engine speed at 4, 050 rpm for 3 seconds or more, then let it idle.
36. 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 PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 34 . If the PCM was substituted, go to step 1 . NO -Go to step 37.
37. Monitor the OBD STATUS for DTC P1078 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 36 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-air-system) . NO -If the HDS indicated FAILED, check for poor connections or loose terminals at the IMT actuator and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 34 . If the PCM was substituted, go to step 1 . If the HDS 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 32

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 to ON (II).
3. Make sure the HDS communicates with the PCM. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
4. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
5. Check the REL TP SENSOR in the DATA LIST with the HDS. The reading should be below 4.3 deg ('10-11 models) or 2.46 deg ('12 model). If it is not, clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-air-system__throttle-body-cleaning) ).

Throttle Body Cleaning

Scheme 33

1. Check for damage to the air cleaner. If the air cleaner is damaged, replace it (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-air-system) ).
2. Remove the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2010-2013/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 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.
4. Install the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
5. Reset the PCM with the HDS.
6. Turn the ignition switch to ON (II), and wait 2 seconds.
7. Do the PCM idle lean procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).

Scheme 34

1. Disconnect the MAF sensor/IAT sensor 5P connector (A).
2. Remove the bolts (B) and (C), then remove harness clamps (D).
3. Remove the air cleaner (E).
4. Install the parts in the reverse order of removal.

Scheme 35

1. Open the air cleaner housing cover (A).
2. Remove the air cleaner element (B) from the air cleaner housing (C). NOTE: Be careful when removing the element, and do not turn upside down. Debris from the element may fall into the MAF sensor/IAT sensor.
3. 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.
4. Clean and remove any debris from inside the air cleaner housing.
5. 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/mdx/ii-2010-2013/remont/schedule/#maintenance) ). If the idle speed fluctuates, do the idle speed inspection procedure, (see «IDLE SPEED INSPECTION»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#idle-control-system__idle-speed-inspection) )

Scheme 36

Scheme 37

1. Remove the air cleaner (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/mdx/ii-2010-2013/remont/mechanical/#intake-air-system) ).
2. Do the battery terminal disconnection procedure (see «USING THE GR8 BATTERY DIAGNOSTIC STATION»(/acura/mdx/ii-2010-2013/remont/body-electrical/#battery) ).
3. Remove the battery (see «RECONNECTION»(/acura/mdx/ii-2010-2013/remont/body-electrical/#battery__reconnection) ).
4. Remove the front bumper (see «FRONT BUMPER REMOVAL/INSTALLATION»(/acura/mdx/ii-2010-2013/remont/exterior-body-panels/#bumpers__front-bumper-removalinstallation) ).
5. Remove the left side headlight (see «WITH HEADLIGHT LEVELING SYSTEM»(/acura/mdx/ii-2010-2013/remont/exterior-lights/#exterior-lights) ).
6. Remove the clips (A) and cover (B).
7. Remove the bolts (C), and resonator (D).
8. Remove the bolts (A) and the resonator chamber (B).
9. Install the parts in the reverse order of removal.
10. Do the battery terminal reconnection procedure (see «USING THE GR8 BATTERY DIAGNOSTIC STATION»(/acura/mdx/ii-2010-2013/remont/body-electrical/#battery) ).
11. Adjust the headlight to local requirements (see «HEADLIGHT ADJUSTMENT»(/acura/mdx/ii-2010-2013/remont/exterior-lights/#exterior-lights__headlight-adjustment) ).

Scheme 38

1. Remove the engine cover (see step 6 under «ENGINE REMOVAL»(/acura/mdx/ii-2010-2013/remont/mechanical/#engine-assembly__engine-removal) ).
2. Disconnect the IMT actuator 5P connector (A).
3. Remove the bolts (B) and the IMT actuator (C).
4. Install the parts in the reverse order of removal with a new O-ring (D).

Throttle Body Removal/Installation

Note. If you are replacing or cleaning the throttle body, begin at step 1. If you are removing the throttle body temporarily, begin at step 4 .

Scheme 39

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 to LOCK (0).
5. Disconnect the MAP sensor 3P connector (A).
6. Remove the intake air duct (B).
7. Disconnect the throttle body connector (C).
8. Disconnect and plug the water bypass hoses (D).
9. Remove the throttle body (E).
10. Install the parts in the reverse order of removal with a new gasket (F). NOTE: When tightening the screw of the hose band (G), align the edge of the hose clamp (H) with the painted mark (I). After the installation, refill the radiator with engine coolant (see «COOLANT CHECK»(/acura/mdx/ii-2010-2013/remont/cooling-fan/#engine-cooling-system) ).
11. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2010-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).

See also:
• GENERAL TROUBLESHOOTING INFORMATION
• ENGINE REMOVAL
• INTAKE MANIFOLD REMOVAL AND INSTALLATION
• PCM IDLE LEARN PROCEDURE
• KNOCK SENSOR REPLACEMENT
• SUBSTITUTING THE PCM
• PCM REPLACEMENT
• DLC CIRCUIT TROUBLESHOOTING
• MAINTENANCE MINDER™
• IDLE SPEED INSPECTION
• USING THE GR8 BATTERY DIAGNOSTIC STATION
• RECONNECTION
• FRONT BUMPER REMOVAL/INSTALLATION
• WITH HEADLIGHT LEVELING SYSTEM
• HEADLIGHT ADJUSTMENT
• COOLANT CHECK
• IMT ACTUATOR REPLACEMENT
• THROTTLE BODY CLEANING
• THROTTLE BODY REMOVAL/INSTALLATION