Fuel Cut Control System - Miata

WARNING: This page is about a different car, the 2001 Mazda Protege, 2001 Mazda Millenia, 2001 Mazda MX-5 Miata, 2001 Mazda MPV, and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

To check system operation, connect New Generation Star (49 T088 0A0) scan tool to DLC-2. DLC-2 is located under left side of instrument panel, behind fuse block cover. Ensure engine is at normal operating temperature. Allow engine to idle. Turn A/C switch off.
Using scan tool, access DIAGNOSTIC DATA LINK menu, and select PCM. Highlight and select PID/DATA MONITOR AND RECORD. Select RPM and INJ. Scan tool will measure and display fuel injector pulse width. Increase engine speed to 2500 RPM, then quickly close throttle valve.
Fuel injection pulse width should be zero milliseconds until engine speeds drops below 1000 RPM, then pulse width should be 2-5 milliseconds. If pulse width is as specified, Fuel cutoff system is functioning properly.