Mazdaspeed6 L4-2.3L Turbo (2006)
Fuel Cut Control Unit: Testing and Inspection
Fuel Cut Control System Inspection
NOTE: This inspection has to be performed after the Fuel Injector Operation Inspection.
If simulation function of WDS or equivalent is used:
1. Warm up the engine and idle it.
2. Connect the WDS or equivalent 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.
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If not as specified, inspect the following.
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ECT sensor and related wiring harness
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Neutral switch and related wiring harness
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Clutch switch and related wiring harness
If simulation function of WDS or equivalent 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 tie 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 the wave appears when
the engine speed drops below 1,200 rpm.
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If not as specified, inspect the following.
-
ECT sensor and related wiring harness
-
Neutral switch and related wiring harness
-
Clutch switch and related wiring harness
