DIAGNOSIS FUNCTION




  • DIAGNOSIS CODE
  • Data list output
  • Actuator test
  • Diagnosis deletion using M.U.T.-III
  • Freeze frame data
  • Status indication by diagnosis code
  • ECU information display
note If a diagnosis code is set, the "status indication by diagnosis code" informs users whether a mechanical problem currently exists (current trouble) or whether it existed before but normal operation has been restored (past trouble).

HOW TO READ DIAGNOSIS CODE
caution Before connecting or disconnecting the M.U.T.-III, turn the electric motor switch to the "LOCK" (OFF) position.


Connect the M.U.T.-III to the 16-pin diagnosis connector, and read the diagnosis code.
note
  • For details on how to use the M.U.T.-III, refer to the "M.U.T.-III operation manual."
  • For the vehicles with security alarm sensor, when the M.U.T.-III is connected, if the electric motor switch is turned to the "ON" position and the closed hood is opened, the security alarm siren sounds short. This short security alarm siren does not indicate malfunction. Therefore, ignore it and carry out diagnosis using M.U.T.-III.
  • If the electric motor switch is turned to the "ON" position with M.U.T.-III connected to the vehicle, headlamp automatic levelling warning is displayed on the multi-information display in the combination meter. This symptom occurs because the headlamp automatic levelling-ECU enters the diagnosis mode when the M.U.T.-III is connected to the diagnosis connector, and it does not indicate malfunction. Therefore, ignore the indicator display and carry out diagnosis using M.U.T.-III. (When the M.U.T.-III starts communication with the ECU, the indicator display disappears.)
1.Ensure that the electric motor switch is at the "LOCK" (OFF) position.
2.Start up the personal computer.
3.Connect special tool M.U.T.-III USB cable (MB991827) to V.C.I. (MB991824) and the personal computer.
4.Connect special tool M.U.T.-III main harness A (MB991910) to the V.C.I.
5.Connect the M.U.T.-III main harness A to the diagnosis connector of the vehicle.
6.Turn the V.C.I. electric motor switch to the "ON" position.
note When the V.C.I. is energized, the V.C.I. indicator lamp will be illuminated in a green colour.
7.Start the M.U.T.-III system on the personal computer and turn the electric motor switch to the "ON" position.
8.Read the diagnosis code.
note When storing the diagnosis code as reference information, the freeze frame data obtains the data when the diagnosis code is confirmed, and then stores the ECU status of that time. By analysing each data using M.U.T.-III, troubleshooting can be carried out efficiently.
9.Disconnecting the M.U.T.-III is the reverse of the connecting sequence, making sure that the electric motor switch is at the "LOCK" (OFF) position.

ERASING DIAGNOSIS CODE
caution Before connecting or disconnecting the M.U.T.-III, turn the electric motor switch to the "LOCK" (OFF) position.


Connect the M.U.T.-III to the diagnosis connector, and erase the diagnosis code. The procedure is the same as "How to Read Diagnosis Code ."