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Home >> Mazda >> 2021 >> 3 Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Fuel System (VIN M)) >> Fuel Injector Inspection >> Fuel Cut Control Inspection

Fuel Cut Control Inspection

WARNING: This page is about a different variant/trim than selected.
  1. Connect the M-MDS to the DLC-2.
  2. Warm up the engine and idle it.
  3. Load the vehicle on a chassis dynamometer or drive the vehicle on a road.
    WARNING:
    • When performing the procedure from Step 4 on the chassis dynamometer, be careful not to get parts such as tires or rollers caught in the rotating parts.
    • When performing the procedure from Step 4 on a road while driving, always observe the following to ensure safety.
      • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
      • While performing this step, always operate the vehicle in a safe and lawful manner.
  4. Verify the PCM PIDs [ENG_RPM] and [FUEL_PULSE_WD] using the PID/data monitor function. (See PID/DATA MONITOR INSPECTION .)
  5. Drive the vehicle while verifying the PID [ENG_RPM] and maintain the engine speed at 4, 000 rpm or more.
  6. When the accelerator pedal is released without depressing the brake pedal, verify that the PID [FUEL_PULSE_WD] indicates 0 ms until the PID [ENG_RPM] reaches approx. 1, 200 rpm and the PID [FUEL_PULSE_WD] indicates 2 to 5 ms when the PID [ENG_RPM] is approx. 1, 200 rpm or less.
    • If it cannot be verified, inspect the following items.
      • Under load/under no-load determination signal
      • Engine coolant temperature (ECT) sensor
      • Accelerator pedal position (APP) sensor
      • A/C request signal
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