Inspecting Idle Speed

Start the engine and let it warm up until the cooling fan comes on. Ensure all accessories are off.
Connect a tachometer to the test tachometer connector. Connect power for tachometer to jump start terminal located in the engine compartment fuse/relay box. See Fig 1.
For engine idle speed, see ENGINE IDLE SPEED .
For adjustment procedures, see ON-VEHICLE ADJUSTMENTS -- NSX & NSX-T article.

Fig 1: Connecting Test Tachometer

Courtesy of AMERICAN HONDA MOTOR CO., INC.

ENGINE IDLE SPEED