Required Special Tools:
- MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
- MB992745: V.C.I.-Lite main harness A
- MB992747: V.C.I.-Lite USB cable short
- MB992748: V.C.I.-Lite USB cable long
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
1. Before inspection, set the vehicle to the pre-inspection condition.
2. caution | To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III). |
Turn the ignition switch to the "LOCK" (OFF) position and then connect scan tool (M.U.T.-III) to the data link connector. (Refer to GROUP 13A - Multiport Fuel Injection (MFI) Diagnosis, Diagnostic Function
).
3. Set the timing light to the power supply line (terminal No. 3) of the ignition coil No. 1.note | The power supply line is looped and also longer than the other ones. |
4. Start the engine and run it at idle.
5. Check that the idle speed is approximately 650 r/min.
6. Select scan tool (M.U.T.-III) actuator test "item number 11".
7. Check that basic ignition timing is within the standard value.Standard value: 5° BTDC ± 3°
8. If the basic ignition timing is not within the standard value. (Refer to GROUP 13A - Multiport Fuel Injection (MFI) Diagnosis, Symptom Chart ).caution | If the actuator test is not canceled, the forced drive will continue for 27 minutes. Driving in this state could lead to engine failure. |
9. Cancel the setting mode of the scan tool (M.U.T.-III).
10. Check that the actual ignition timing is at the standard value.Standard value: Approximately 5° BTDC
note | The ignition timing fluctuates about ± 7°, even under normal operating condition. |
note | It is automatically further advanced by about 5° from 10° Before Top Dead Center at higher altitudes. |
note | Wait till approximately 1 minute passes after the engine started, and check the ignition timing when the engine stabilized. |
11. Remove the timing light.
12. caution | To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III). |
Turn the ignition switch to the "LOCK" (OFF) position and then disconnect the scan tool (M.U.T.-III).