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Home >> Mazda >> 2007 >> CX-7 Sport, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting (Engine - L3 With TC) >> Engine Control System Operation Inspection >> Fuel Cut Control System Inspection

Fuel Cut Control System Inspection

NOTE:
  • This inspection has to be performed after the Fuel Injector Operation Inspection.

If simulation function of M-MDS is used: 

  1. Warm up the engine and idle it.
  2. Connect the M-MDS to the DLC-2.
  3. Select the RPM and the FUELPW1 PIDs.
  4. Monitor 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 msec.  , and 2-5 msec  . when the RPM PID drops below 1,200 rpm  .

If simulation function of M-MDS is not used: 

  1. Warm up the engine and idle it.
  2. 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 constantB+  , and the wave appears when the engine speed drops below 1,200 rpm  .

      (See PCM INSPECTION ).

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