Fuel Cut Control System Inspection

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 2.0, 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

Item (definition)	Unit/Condition	Definition	Condition/Specification (Reference)
FUELPW	Sec	Fuel injection pulse width (fuel injector energization time) output to fuel injector	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 .)