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 MANUALSMAZDA2013MX-5 MIATA GRAND TOURING, AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM LF 2.0L]ENGINE CONTROL SYSTEM OPERATION INSPECTION [LF]FUEL CUT CONTROL SYSTEM INSPECTION

2013 Mazda MX-5 Miata Grand Touring, Automatic Trans

Fuel Cut Control System Inspection

2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION Fuel Cut Control System Inspection

NOTE:

This inspection has to perform after the Fuel Injector Operation Inspection.

If simulation function of M-MDS is used:

Warm up the engine and idle it.
Connect the M-MDS to the DLC-2.
Select the RPM and FUELPW1 PIDs.
Monitor the both PIDs while performing the following steps.
1. Depress the accelerator pedal and increase the RPM PID to 4, 000 rpm.
2. Quickly release the accelerator pedal (brake pedal is not depressed) and verify that the FUELPW1 PID is 0 ms, and 2-5 ms when the RPM PID drops below 1, 200 rpm.
  - If not as specified, inspect the following:
    - ECT sensor and related harness (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [LF] ).
    - Neutral switch and related harness (See NEUTRAL SWITCH INSPECTION [LF] ).
    - CPP and related harness (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [LF] ).

If simulation function of M-MDS is not used:

Warm up the engine and idle it.
Measure the fuel injector control signal wave profile using the oscilloscope while performing the following steps.
1. Depress the accelerator pedal and increase the engine speed to 4, 000 rpm.
2. Quickly release the accelerator pedal (brake pedal is not depressed) and verify that the wave profile constant B+, and appears wave, when the engine speed drops below 2, 200 rpm. (See PCM INSPECTION [LF] ).
  - If not as specified, inspect the following:
    - ECT sensor and related harness (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [LF] ).
    - Neutral switch and related harness (See NEUTRAL SWITCH INSPECTION [LF] ).
    - CPP and related harness (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [LF] ).
    - TR switch and related wiring harness (AT) (See TRANSMISSION RANGE (TR) SWITCH INSPECTION [SJ6A-EL] ).

RENDER: 1.0x

NO RELATED

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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.