Fuel Cut Control System Inspection

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

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

If data monitor function of M-MDS is used:

Warm up the engine and idle it.
Connect the M-MDS to the DLC-2.
Select the RPM and the FUELPW PIDs. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5] .)
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 FUELPW PID is 0 msec , and 2-5 msec when the RPM PID drops below 1, 200 rpm.
  - If not as specified, inspect the following:
    - ECT sensor No. 1 and related wiring harness (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION .)

RELATED PIDS SPECIFICATION

Item (definition)	Unit/Condition	Definition	Condition/Specification (Reference)
FUELPW	Sec	Fuel injector duration	Idle (after warm up): Approx. 1.4 ms Racing (engine speed is 2, 000 rpm): Approx. 1.1 ms Racing (engine speed is 4, 000 rpm): Approx. 1.0 ms
RPM	RPM	Engine speed	Displays engine speed

If data monitor function of M-MDS is not used:

Warm up the engine and idle it.
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 constant B+ , and the wave appears when the engine speed drops below 1, 200 rpm. (See PCM INSPECTION .)
  - If not as specified, inspect the following:
    - ECT sensor No. 1 and related wiring harness (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION .)