Idle Control System: Diagnosis Acura MDX II facelift

Idle Speed Inspection

Note. Before checking the idle speed, check these items: The malfunction indicator lamp (MIL) has not been reported on, and there are no DTCs. Ignition timing Spark plugs-Air cleaner PCV system Apply the parking brake and make sure the headlights are off.

Scheme 278

1. Disconnect the evaporative emission (EVAP) canister purge valve connector (see step 1 under «EVAP CANISTER PURGE VALVE REPLACEMENT»(ref-510475-S01066180852012102300000) ).
2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Turn the ignition switch to ON (II).
4. Make sure the HDS communicates with the PCM. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(ref-510432-S07908248052012102300000) ).
5. 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.
6. Check the idle speed without load conditions: headlights, blower fan, radiator fan, and A/C off. Idle speed should be: 710 ± 50 rpm (in P or N)
7. Let the engine idle for 1 minute with high electric load (the A/C switch on, the temperature set to max cool, the blower fan on high, and the headlights on high beam). Idle speed should be: 710 ± 50 rpm (in P or N) NOTE: If the idle speed is not within specification, do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(ref-510456-S37172493852012102300000) ). If the idle speed is still not within specification, go to symptom troubleshooting.
8. Reconnect the EVAP canister purge valve connector.