Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA20113 MAZDASPEED, 2.3 3REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 7 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 2.3L)FUEL SYSTEMFUEL CONTROLFUEL CUT CONTROL SYSTEM
2011 Mazda 3 Mazdaspeed, 2.3 3
Fuel Cut Control System
2011 Mazda 3 Mazdaspeed, 2.3 3SECTION Fuel Cut Control System
WARNING: This page is about a different car, the 1997 Mazda Millenia. 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 Data Link Connector (DLC) 2. DLC 2 is located under left side of instrument panel, right of steering column. 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 INJR and INJL. Scan tool will measure and display fuel injector pulse width. Increase engine speed to 4000 RPM, then quickly close throttle valve.
- Fuel injection pulse width should be zero milliseconds until engine speeds drops to about 1200 RPM, then pulse width should return to specification noted prior to increasing engine speed. If pulse width is as specified, A/C cutoff system is functioning properly.
- If pulse width is not as specified, measure voltage at ECM terminals 3Q (ECT sensor circuit), 3X (closed throttle position switch circuit), 4AH and 4AL (crankshaft position sensor circuit). See PIN VOLTAGE/PID VALUE CHARTS - 2.3L article. Repair as necessary.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.