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Idle Control System: Overview Acura RL II facelift

Testing & Diagnostics 10 illustrations ~2155 words

Scheme 232

Scheme 232: Component Location Index
Scheme 232: Component Location Index

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. 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 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) VSS 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-348519-S42264851032009112400000) ). Also check for damage at the air cleaner element (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(ref-348519-S08777435662009112400000) ), 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»(ref-348519-S01599103842009112400000) ).
  9. Reset the PCM with the HDS.
  10. Do «PCM IDLE LEARN PROCEDURE»(ref-348529-S13364648212009112400000) .
  11. 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 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) VSS is 0 mph (0 km/h) ST FUEL TRIM between 0.73 and 1.47 FSS is CLOSED
  13. Check for Temporary DTCs or 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 Temporary DTCs or DTCs were indicated in step 13, go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check the A/C system and/or 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-348519-S42264851032009112400000) ). Also check for damage at the air cleaner element (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(ref-348519-S08777435662009112400000) ), 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, 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 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 GENERAL TROUBLESHOOTING INFORMATION .

  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. 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.
  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, change the 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).
  7. Reset the PCM with the HDS.
  8. Do «PCM IDLE LEARN PROCEDURE»(ref-348529-S13364648212009112400000) .
  9. 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.
  10. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0507 indicated? YES - Check for poor connections or loose terminals at the throttle body and the 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 Temporary DTCs or DTCs were indicated in step 10, go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the throttle body and the 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, blower motor, or A/C, change the gear position, etc.), then go to step 9 .

Scheme 233

Scheme 233: A/C Signal Circuit Troubleshooting
Scheme 233: A/C Signal Circuit Troubleshooting
  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 - Do the A/C pressure sensor circuit troubleshooting (see «DTC B2979 OR PRE SENSOR OPEN IS INDICATED: AN OPEN IN THE A/C PRESSURE SENSOR CIRCUIT»(ref-348520-S31587374522009112400000) ).
  5. Check the A/C system. 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).
  7. Turn the ignition switch to ON (II).
  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 «A/C SYSTEM TEST»(ref-348520-S22027111812009112400000) . NO - Go to step 9 .
  9. Momentarily connect PCM connector terminal E27 to body ground with a jumper wire several times. Is there a clicking noise from the A/C compressor clutch? YES - Update the PCM if it does not have the latest software (see «PCM UPDATE»(ref-348508-S21120732372009112400000) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-348507-S19166854742009112400000) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(ref-348508-S08692035992009112400000) ). NO - Check for poor connections or loose terminals at the A/C compressor clutch relay in the under-hood fuse/relay box and the PCM. If the connections are OK, check the A/C compressor clutch relay (see «POWER RELAY TEST»(ref-348527-S40346938242009112400000) ), repair open in the wire between the PCM (E27) and the A/C compressor clutch relay.

Scheme 234

Scheme 234: Alternator FR Signal Circuit Troubleshooting
Scheme 234: Alternator FR Signal Circuit Troubleshooting
  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).
  5. Jump the SCS line with the HDS.
  6. Disconnect the alternator 4P connector.
  7. Disconnect PCM connector A (3IP).
  8. Check for continuity between body ground and PCM connector terminal A12. Is there continuity? YES - Repair short in the wire between the PCM (A12) and the alternator. NO - Update the PCM if it does not have the latest software (see «PCM UPDATE»(ref-348508-S21120732372009112400000) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-348507-S19166854742009112400000) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(ref-348508-S08692035992009112400000) ).

Scheme 235

Scheme 235: PSP Switch Signal Circuit Troubleshooting
Scheme 235: PSP Switch Signal Circuit Troubleshooting

Scheme 236

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Scheme 238

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Scheme 238

Scheme 239

Scheme 239
Scheme 239
  1. Start the engine, and let it idle.
  2. Align the steering wheel straight ahead.
  3. Check the PSP SWITCH in the DATA LIST with the HDS. Does it indicate ON? YES - Go to step 4 . NO - Go to step 14 .
  4. Turn the steering wheel to the full lock position.
  5. Check the PSP SWITCH in the DATA LIST with the HDS. Does it change to OFF? YES - The PSP switch signal circuit is OK. NO - Go to step 6 .
  6. Turn the ignition switch to LOCK (0).
  7. Disconnect the PSP switch 2P connector.
  8. Start the engine.
  9. Check the PSP SWITCH in the DATA LIST with the HDS. Does it change to OFF? YES - Replace the PSP switch. NO - Go to step 10 .
  10. Turn the ignition switch to LOCK (0).
  11. Jump the SCS line with the HDS.
  12. Disconnect PCM connector E (31P).
  13. Check for continuity between PSP switch 2P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (E17) and the PSP switch. NO - Update the PCM if it does not have the latest software (see «PCM UPDATE»(ref-348508-S21120732372009112400000) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-348507-S19166854742009112400000) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(ref-348508-S08692035992009112400000) ).
  14. Turn the ignition switch to LOCK (0).
  15. Disconnect the PSP switch 2P connector.
  16. Connect PSP switch 2P connector terminals No. 1 and No. 2 with a jumper wire, then turn the ignition switch to ON (II).
  17. Check the PSP SWITCH in the DATA LIST with the HDS. Does it change to ON? YES - Replace the PSP switch. NO - Go to step 18 .
  18. Turn the ignition switch to LOCK (0).
  19. Remove the jumper wire from the PSP switch 2P connector.
  20. Jump the SCS line with the HDS.
  21. Disconnect PCM connector E (31P).
  22. Connect PSP switch 2P connector terminal No. 1 to body ground with a jumper wire.
  23. Check for continuity between body ground and PCM connector terminal E17. Is there continuity? YES - Go to step 24 . NO - Repair open in the wire between the PSP switch and the PCM (E17).
  24. Check for continuity between PSP switch 2P connector terminal No. 2 and body ground. Is there continuity? YES - Update the PCM if it does not have the latest software (see «PCM UPDATE»(ref-348508-S21120732372009112400000) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-348507-S19166854742009112400000) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(ref-348508-S08692035992009112400000) ). NO - Repair open in the wire between the PSP switch and G401.

Scheme 240

Scheme 240: Brake Pedal Position Switch Signal Circuit Troubleshooting
Scheme 240: Brake Pedal Position Switch Signal Circuit Troubleshooting

Scheme 241

Scheme 241
Scheme 241
  1. Turn the ignition switch to ON (II).
  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-348510-S03359604102009112400000) ).
  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).
  5. Jump the SCS line with the HDS.
  6. Disconnect the brake pedal position switch 4P connector.
  7. Disconnect PCM connector E (31P).
  8. Check for continuity between PCM connector terminal E8 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (E8) and the No. 13 HORN, STOP (15 A) fuse. Replace the No. 13 HORN, STOP (15 A) fuse. NO - Go to step 9 .
  9. Check for continuity between PCM connector terminal E8 and brake pedal position switch 4P connector terminal No. 2. Is there continuity? YES - Repair open in the wire between the brake pedal position switch and the No. 13 HORN, STOP (15 A) fuse. Inspect the brake pedal position switch (see «BRAKE PEDAL AND BRAKE PEDAL POSITION SWITCH ADJUSTMENT»(ref-348510-S03359604102009112400000) ). NO - Repair open in the wire between the PCM (E8) and the brake pedal position switch.

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