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Perform Engine Tune-Up

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 this does not indicate a malfunction. The engine control returns to normal when the accelerator pedal is released.

1.Connect the M-MDS to the DLC-2.

2.Verify that the selector lever is in the P or N position.

Note

• The engine coolant temperature and oil temperature can be verified by the M-MDS PIDs 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 running, wait until it stops running.

Idle speed verification

Note

• Idle speed cannot be adjusted.

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

1.Perform the preparations for the engine tune-up. (SeeEngine tune-up preparation)

2.Verify the idle speed (PID: ENG_RPM) using the M-MDS data monitor function.

• If there is a malfunction, refer to the symptom troubleshooting.

Ignition timing verification

Note

• The ignition timing cannot be adjusted.

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

1.Perform the preparations for the engine tune-up. (SeeEngine tune-up preparation)

2.Verify the ignition timing (PID: SPARK_ADV) using the M-MDS data monitor function.

3.Increase the engine speed gradually and verify that the ignition timing advances.

• If there is a malfunction, refer to the symptom troubleshooting.

Idle CO, HC concentration verification

1.Verify that the idle speed and ignition timing are within the standard.

2.Set up the CO, HC tester.

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

• If there is a malfunction, refer to the symptom troubleshooting.

― If there is no malfunction, replace the catalytic converter.

Idle increase control verification

Note

• Idle speed cannot be adjusted.

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

1.Perform the preparations for the engine tune-up. (SeeEngine tune-up preparation)

2.Verify the idle speed according to each load (PID: ENG_RPM) using the M-MDS data monitor function (except idle speed decrease after applying load).

• If there is any malfunction, inspect the related input parts, wiring harnesses, and connectors.