Idle Control System: Overview Acura TL IV facelift

Scheme 350

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

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. 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 for 20 seconds or more.
4. Check for these conditions in the DATA LIST with the HDS: ECT SENSOR 1 above 158°F (70°C) IAT SENSOR above 32°F (0°C) VEHICLE SPEED is 0 mph (0 km/h) ST FUEL TRIM between 0.73 and 1.47 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, keep idling 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»(ref-512345-S27602551462012103100000) ). Also check for damage to the air cleaner element (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(ref-512345-S32841768522012103100000) ), then go to step 9. If there is damage in the throttle bore, go to step 8. NO - Check the A/C system or the power steering system, then go to step 17.
8. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(ref-512345-S22857250882012103100000) ).
9. Reset the ECM/PCM with the HDS.
10. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-512362-S04299387872012103100000) ).
11. 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 for 20 seconds or more.
12. Check for these conditions in the DATA LIST with the HDS: ECT SENSOR 1 above 158°F (70°C) IAT SENSOR above 32°F (0°C) VEHICLE SPEED is 0 mph (0 km/h) ST FUEL TRIM between 0.73 and 1.47 FSS is CLOSED
13. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0506 indicated? YES - Go to step 1 and recheck. 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. If any other Pending or Confirmed DTCs were indicated in step 13, go to the indicated «DTC'S TROUBLESHOOTING»(ref-512362-S00287267862012103100000). NO - If the screen indicates FAILED, check the A/C system and/or the power steering system, then go to step 1. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 12.
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»(ref-512345-S27602551462012103100000) ). Also check for damage to the air cleaner element (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(ref-512345-S32841768522012103100000) ), 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, the rear window defogger and/or the A/C, change 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, the system is OK at this time. NO - If the screen indicates FAILED, check the A/C system and/or the power steering system, then go to step 1 . If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 12 .

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

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. 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.
4. Monitor the OBD STATUS for DTC P0507 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 5. NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. If the screen indicates EXECUTING, keep idling 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. Check for vacuum leaks at these parts: PCV valve PCV hose EVAP canister purge valve Throttle body Intake manifold Brake booster hose Brake booster Are there any leaks? YES - Repair or replace the leaking part(s), then go to step 6. NO - Go to step 6.
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
7. Reset the ECM/PCM with the HDS.
8. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-512362-S04299387872012103100000) ).
9. 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.
10. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0507 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then go to step 1 . NO - Go to step 11.
11. Monitor the OBD STATUS for DTC P0507 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 instep 10, go to the indicated «DTC'S TROUBLESHOOTING»(ref-512362-S00287267862012103100000). NO - If the screen indicates FAILED, check for poor connections or loose terminals at the throttle body and the ECM/PCM, then go to step 1. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, recheck with different load conditions (turn on the headlights, the blower motor, or the A/C; change the gear position, etc.), then go to step 9.

Scheme 351

1. Start the engine.
2. Turn the blower switch on.
3. Turn the A/C switch on.
4. Check the A/C CLUTCH in the DATA LIST with the HDS. Does it indicate ON? YES - Go to step 5. NO - Check the A/C system (see «A/C SERVICE TIPS AND PRECAUTIONS»(ref-512346-S08779950422012103100000) ).
5. Check the A/C system operation. Does the A/C system operate? YES - The air conditioning system circuit is OK. NO - Go to step 6.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
8. Activate the A/C CLUTCH in the INSPECTION MENU with the HDS. Is there a clicking noise from the A/C compressor clutch? YES - Do the A/C system test (see «A/C SYSTEM TEST»(ref-512346-S36006831932012103100000) ). NO - Go to step 9.
9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Jump the SCS line with the HDS.
11. Disconnect ECM/PCM connector A (49P).
12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
13. Momentarily connect ECM/PCM connector terminal A13 to body ground with a jumper wire several times. Is there a clicking noise from the A/C compressor clutch? YES - Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(ref-512332-S15795428962012103100000) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(ref-512356-S00793962012012103100000) ), then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(ref-512332-S08907075282012103100000) ). NO - Check for poor connections or loose terminals at the A/C clutch relay and the ECM/PCM. If the connections are OK, check the A/C clutch relay (see «POWER RELAY TEST»(/acura/tl/iv-facelift-2011-2014/remont/body-electrical/#relays__power-relay-test) ). If needed, repair open in the wire between the ECM/PCM (A13) and the A/C clutch relay, and check the other A/C system parts.

Scheme 352

1. Start the engine, and let it idle.
2. Monitor the ALTERNATOR in the DATA LIST with the HDS.
3. Check if the indicated percentage varies when the headlight switch is turned on. Does the percentage vary? YES - The alternator signal circuit is OK. NO - Go to step 4.
4. Turn the headlight switch off, and turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
5. Jump the SCS line with the HDS.
6. Disconnect the alternator 4P connector.
7. Disconnect ECM/PCM connector C (49P).
8. Check for continuity between ECM/PCM connector terminal C44 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (C44) and the alternator. NO - Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(ref-512332-S15795428962012103100000) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(ref-512356-S00793962012012103100000) ), then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(ref-512332-S08907075282012103100000) ).

Scheme 353

Scheme 354

Scheme 355

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check the BRAKE SWITCH in the DATA LIST with the HDS. Does it indicate OFF? YES - Go to step 3. NO - Inspect the brake pedal position switch (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(ref-512334-S10089819752012103100000) ).
3. Press the brake pedal, and check the BRAKE SWITCH in the DATA LIST with the HDS. Does it change to ON? YES - The brake pedal position switch signal circuit (BKSW line) is OK. NO - Go to step 4.
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
5. Jump the SCS line with the HDS.
6. Disconnect the brake pedal position switch 4P connector.
7. Disconnect ECM/PCM connector A (49P).
8. Check for continuity between ECM/PCM connector terminal A8 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (A8) and the brake pedal position switch. Also replace the No. 10 HORN/STOP (20 A) fuse in the under-hood fuse/relay box. NO - Go to step 9.
9. Connect brake pedal position switch 4P connector terminal No. 2 to body ground with a jumper wire.
10. Check for continuity between ECM/PCM connector terminal A8 and body ground. Is there continuity? YES - Repair open in the wire between the brake pedal position switch and the No. 10 HORN/STOP (20 A) fuse in the under-hood fuse/relay box. Also check the brake pedal position switch (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(ref-512334-S10089819752012103100000) ). NO - Repair open in the wire between the ECM/PCM (A8) and the brake pedal position switch.

See also:
• POWER RELAY TEST