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Home >> Mazda >> 2005 >> 3 i, Automatic >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Fuel System >> Fuel Injector Inspection >> Fuel Cut Control Inspection
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Fuel Cut Control Inspection

  1. Connect the WDS or equivalent to the DLC-2.
    Fig 1: Identifying DLC-2 Connector
    G03635865Courtesy of MAZDA MOTORS CORP.
  2. Warm up the engine and idle it.
  3. Turn off all the electrical loads and the A/C switch.
  4. Using "RPM" of the PID/data monitor function, verify the engine speed.
  5. Using a soundscope or screwdriver, verify the operation sound of the fuel injector at all cylinders.
    1. Open the throttle valve and increase the engine speed to 4,000 rpm. 
    2. Close the throttle valve instantaneously and verify that the fuel injector operation sound stops until the engine speed decreases to approx. 2,200 rpm  and the sound is heard when the engine speed is approx. 2,200 rpm  or less.
      • If the sound does not stop at all cylinders, inspect the following:
        • PCM input signal circuit (sensor, wiring harness)
          • Throttle opening signal (throttle position sensor)
      • If the sound does not stop at specific cylinders, inspect the following:
        • Corresponding fuel injector and related wiring harnesses and connectors
      • If the operation sound stops at all cylinders but the engine speed at which the operation sound recovers is not within the specification, inspect the following:
        • PCM input signal circuit (sensor, wiring harness)
          • Load/no load detection signal (neutral/clutch switch (MTX), transaxle range switch (ATX))
          • Water temperature signal (water temperature sensor)
  6. Place the vehicle on a chassis dynamometer.
  7. Inspect the following using the WDS or equivalent.
    1. Verify the injector actuation time using the PID/data monitor function.
    2. Depress the accelerator pedal and increase the engine speed to 4,000 rpm.  (Loaded range)
    3. With the accelerator pedal released (without depressing the brake pedal), verify that the injector actuation time of 0 ms  is indicated until the engine speed decreases to approx. 2,200 rpm  and then the actuation time 2-5 ms  is indicated when the engine speed decreases to approx. 870 rpm or less  (MTX) or 820 or less  (ATX).
      • If it cannot be verified, inspect the PCM input signal circuit.
        • Load/no load detection signal (neutral/clutch switch (MTX), transaxle range switch (ATX))
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