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DIAGNOSTIC FUNCTION


HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)
Required Special Tools:
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)

    • MB991824: Vehicle 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)

caution To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1.Ensure that the ignition switch is at the "LOCK" (OFF) position.
2.Start up the personal computer.
3.Connect special tool MB991827 to special tool MB991824 and the personal computer.
4.Connect special tool MB991910 to special tool MB991824
5.Connect special tool MB991910 to the data link connector.
6.Turn the power switch of special tool MB991824 to the "ON" position.
note When the special tool MB991824 is energized, the special tool MB991824 indicator light will be illuminated in a green color.
7.Start the M.U.T.-III system on the personal computer.
note Disconnecting the scan tool special tool MB991824 is the reverse of the connecting sequence, making sure that the ignition switch is at the "LOCK" (OFF) position.

HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES
Required Special Tools:
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)

    • MB991824: Vehicle 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)

caution To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
note If the battery voltage is low, diagnostic trouble codes will not be output. Check the battery if scan tool MB991958 does not display.
1.Connect the scan tool MB991958 to the data link connector.
2.Turn the ignition switch to the "ON" position.
3.Select "System select" from the start-up screen.
4.Select "From 2006 MY" of "Model Year." When the "Vehicle Information" is displayed, check the contents.
5.Select "AUTO A/C" from "System List," and press the "OK" button.
note When the "Loading Option Setup" list is displayed, check the applicable item.
6.Select "Diagnostic Trouble Code."
7.If a DTC is set, it is shown.
8.Choose "Erase DTCs" to erase the DTC.

HOW TO READ DATA LIST
Required Special Tools:
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)

    • MB991824: Vehicle 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)

caution To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1.Connect the scan tool MB991958 to the data link connector.
2.Turn the ignition switch to the "ON" position.
3.Select "Interactive Diagnosis" from the start-up screen.
4.Select "System Select."
Select "AUTO A/C" from "System List," and press the "OK" button.
5.Select "Data List."
6.Choose an appropriate item and select the "OK" button.

HOW TO PERFORM ACTUATOR TEST
Required Special Tools:
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)

    • MB991824: Vehicle 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)

caution To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1.Connect the scan tool MB991958 to the data link connector.
2.Turn the ignition switch to the "ON" position.
3.Select "System Select."
4.Select "AUTO A/C" from "System List," and press the "OK" button.
5.Choose "Actuator Test" from "AUTO A/C" screen.
6.Choose an appropriate item and select the "OK" button.

HOW TO DIAGNOSE THE CAN BUS LINE
Required Special Tools:
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)

    • MB991824: Vehicle Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A

caution To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1.Connect scan tool MB991958 to the data link connector.
2.Turn the ignition switch to the "ON" position.
3.Select "CAN bus diagnosis" from the start-up screen.
4.When the vehicle information is displayed, confirm that it matches the vehicle whose CAN bus lines will be diagnosed.

  • If they match, go to step 8.
  • If not, go to step 5.
5.Select "view vehicle information" button.
6.When the vehicle information is displayed, confirm again that it matches the vehicle which is diagnosed CAN bus line.

  • If they match, go to step 8.
  • If not, go to step 5.
7.Press the "OK" button.
8.When the options are displayed, choose the options (mark the check) and then select "OK".

CHECK OF FREEZE FRAME DATA


The freeze frame data can be checked by using the scan tool (GROUP 00, How to Cope with Intermittent Malfunction ).
When detecting fault and storing the DTC, the ECU connected to CAN bus line obtains the data before the determination of the DTC and the data when the DTC is determined, and then stores the ECU status of that time. By analyzing the data from scan tool, the troubleshooting can be performed more efficiently. The displayed items are as shown in the table below.

Display item list
Item No.
 Item name
 Data item
 Unit
01
 Odometer
 Total driving distance after the diagnostic trouble code is generated
 km*
02
 Ignition cycle
 Number of times the ignition switch is turned "ON" or "LOCK (OFF)" after the past failure transition
 Number of counts is displayed.
04
 Current trouble accumulative time
 Cumulative time for current malfunction of diagnostic trouble code
 min
note
  • *: If a failure occurs to both the ABS-ECU and ETACS-ECU, 0000 km or FFFF km is displayed to the scan tool MB991958.