Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Cut Control System Inspection
- 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:
- Depress the accelerator pedal and increase the RPM PID to 4, 000 rpm .
- 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 .)
- If not as specified, inspect the following:
| Item (definition) | Unit/Condition | Definition | Condition/Specification (Reference) |
|---|---|---|---|
| FUELPW | Sec | Fuel injection pulse width (fuel injector energization time) output to fuel injector |
|
| RPM | RPM | 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:
- Depress the accelerator pedal and increase the engine speed to 4, 000 rpm .
- 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
0PCM INSPECTION
SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
- If not as specified, inspect the following:
- ECT sensor No. 1 and related wiring harness (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION .)
- If not as specified, inspect the following:
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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