ENGINE TUNE-UP [WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)]

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Engine Tune-up Preparation

Note

•  If the accelerator pedal is depressed continuously for a specified time, the engine speed may decrease to the idle speed. This is due to the fuel cut control operation, which prevents overheating, and it does not indicate a malfunction. The engine speed returns to normal control when the accelerator pedal is released.

1.  Connect the M-MDS to the DLC-2.

2.  Shift the selector lever (ATX) or shift lever (MTX) to the following position:

•  MTX: Shift lever is in neutral position.

•  ATX: Selector lever is in P position or N position.

Note

•  The engine coolant temperature and oil temperature can be verified by M-MDS PID “ECT” and “OIL_TEMP”.

3.  Run the engine speed at a constant 2,500 to 3,000 rpm and warm up the engine (engine coolant temperature: 80 °C {176 °F} or more, oil temperature: 60 °C {140 °F} or more).

4.  Turn off all electrical loads with the engine idling.

5.  If the cooling fan is operating, wait until is stops.

Idle Speed Inspection

Note

•  The idle speed cannot be adjusted.

•  The M-MDS is required to verify the idle speed.

1.  Prepare for the engine tune-up. (See Engine Tune-up Preparation.)

2.  Verify that the idle speed (M-MDS PID: RPM) is within the specification using the PID/data monitor function of the M-MDS. (See PCM INSPECTION [WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)

•  If there is a malfunction, refer to “ENGINE SYMPTOM TROUBLESHOOTING”. (See SYMPTOM DIAGNOSTIC INDEX [WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)

Ignition Timing Inspection

Note

•  The ignition timing cannot be adjusted.

•  The M-MDS is required to verify the ignition timing.

1.  Prepare for the engine tune-up. (See Engine Tune-up Preparation.)

2.  Verify the ignition timing (M-MDS PID: SPARKADV) using the PID/data monitor function of the M-MDS. (See PCM INSPECTION [WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)

3.  Verify that ignition timing advances when the engine speed increases gradually.

•  If there is a malfunction, refer to “ENGINE SYMPTOM TROUBLESHOOTING”. (See SYMPTOM DIAGNOSTIC INDEX [WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)

Idle Mixture Inspection

1.  Verify that the idle speed and ignition timing are within the specification. (See Idle Speed Inspection.) (See Ignition Timing Inspection.)

2.  Insert an exhaust gas analyzer into the tailpipe.

3.  Verify that the CO and HC concentrations are within regulation.

•  If there is a malfunction, refer to “ENGINE SYMPTOM TROUBLESHOOTING”. (See SYMPTOM DIAGNOSTIC INDEX [WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)

―  If no malfunction is detected, replace the catalytic converter. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)

Idle-up Speed Control Inspection

Note

•  The idle speed cannot be adjusted.

•  The M-MDS is required to verify the idle speed.

1.  Prepare for the engine tune-up. (See Engine Tune-up Preparation.)

2.  Verify that the idle speed according to each load (M-MDS PID: RPM) is within the specification using the PID/data monitor function of the M-MDS (except idle speed decrease after applying load). (See PCM INSPECTION [WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)

•  If the engine speed is not within the specification when a specified load is applied, inspect the related input parts, wiring harnesses, and connectors.