Mazda MX-3 silhouetteMX-3

FUEL-CUT CONTROL SYSTEM

F2-131prose procedure

Step 6 threshold differs: 1,200 rpm (MTX) vs 1,500 rpm (ATX).

Continued from F2-130

System Operation

  1. 1
    Connect a tachometer to the data link connector IG- terminal.
    Engine-bay view showing a TIMING LIGHT and TACHOMETER connected, with a leader to the DATA LINK CONNECTOR and its IG- terminal (inset).
  2. 2
    Connect the SSTs (Engine Signal Monitor and Adapter) to the ECM (Refer to page F2-141.)
    Hookup of the ECM to the Engine Signal Monitor and Adapter via the special service tools, with the battery. SSTs labelled: 49 T018 902, 49 9200 162A, 49 G018 906, 49 D088 008. ECM labelled at lower left.
  3. 3
    Warm-up the engine to normal operating temperature and run it at idle.
  4. 4
    Set the SST to terminal 3U to 3Z and make sure the green and red lights flash alternately.
    Engine Signal Monitor indicator detail: green LED on 0-8V range and red LED on 0-20V range shown illuminated, above an analog meter face graduated 0-20 V and 0-6.
  5. 5
    Increase the engine speed to 4,000 rpm; then suddenly release the throttle.
  6. 6
    Verify that the red indicator light illuminates while the engine speed is above approximately 1,200 rpm (MTX), 1,500 rpm (ATX) on deceleration.
    Engine Signal Monitor indicator detail: green LED on 0-8V range shown off and red LED on 0-20V range illuminated, above an analog meter face graduated 0-20 V and 0-6.
  7. 7
    Increase the engine speed and verify that the maximum rpm does not exceed specification.
    Specifications: Approx. 7,500 rpm
Maximum engine speed (fuel-cut)
Approx. 7,500rpm
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See also

page F2-141

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