Mitsubishi Outlander: Diagnostic Function

ON-BOARD DIAGNOSTICS

If the ASC-ECU detects any problem in the CAN communication line or the ECUs, which the ASC-ECU is communicating with, it stores a diagnostic trouble code. The DTCs have 73 items. The DTCs can be confirmed by connecting scan tool MB991958 (M.U.T.-III sub assembly.) The stored DTCs are not erased even after the ignition switch has been turned to the LOCK (OFF) position, or the battery has been disconnected. The DTCs can be erased by operating scan tool MB991958 (M.U.T.-III sub assembly.)

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

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 the special tool MB991824.

5. Connect special tool MB991910 to the data link connector.

6. Turn the power switch 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: Disconnect the scan tool MB991958 in the reverse order 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

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 set. Check the battery if scan tool MB991958 does not display.

1. Connect scan tool MB991958 to the data link connector.

2. Turn the ignition switch to the "ON" position.

3. Select "System Select".

4. Select "ABS/ASC/ASTC" from the system list, and select the "OK" button.

5. Select "Diagnostic Trouble Code". to read the DTC.

6. If a DTC is set, it is shown.

7. Choose "DTC erase" 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

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 "System Select".

4. Select "ABS/ASC/ASTC" from the system list, and select the "OK" button.

5. Select "Data List".

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

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 "System Select".

4. Select "ABS/ASC/ASTC" from the system list, and select the "OK" button.

5. Choose "Actuator Test" from "ABS" 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 being diagnosed.

• 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".

DIAGNOSTIC FUNCTION

ASC-ECU has the following functions for easier system checks. All the following items can be diagnosed using the scan tool.

• DTC set
• Service data output
• Actuator test
• Freeze frame data output

CHECK OF FREEZE FRAME DATA

The freeze frame data can be checked by using the scan tool.

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 each data from scan tool, the troubleshooting can be performed more efficiently.

The displayed items are as the table below.

Display item list

FAIL-SAFE FUNCTIONS

ASC-ECU constantly monitors the input and output signals. If an error is detected in the system, ASC-ECU sends a fail signal and the corresponding indicator light is illuminated or blinks. Various controls are processed depending on the cause of malfunction as shown below.

Illumination condition of warning light and display in case of failure

NOTE:

• *1: Turns on when two or more wheels are faulty.
• *2: Stays on until the vehicle speed reaches 6 mph (10 km/h) when the ignition switch is turned to ON next time.
• *3: This diagnostic trouble code is not set with the vehicle speed of 12 mph (20 km/h) or less.
• *4: FWD.
• *5: AWD.
• *6: Does not illuminate when there is no effect to the EBD function.
• *7: Does not illuminate when there is no effect to the ABS function.
• *8: Except vehicles with HSA.
• *9: Vehicles with HSA.

Under EBD, ABS, stability control, HSA and TCL control in case of failure

NOTE:

• *1: Prohibited when two or more wheels are faulty.
• *2: This diagnostic trouble code is not set with the vehicle speed of 12 mph (20 km/h) or less.
• *3: FWD.
• *4: AWD.
• *5: Not prohibited when the brake warning light is not illuminated.
• *6: Not prohibited when the ABS warning light is not illuminated.

DIAGNOSTIC TROUBLE CODE CHART

CAUTION During diagnosis, a DTC code associated with another system may be set when the ignition switch is turned on with connector(s) disconnected. On completion, confirm all systems for DTCs. If DTC code(s) are set, erase them all.

NOTE: *: When the diagnosis codes relating to the CAN communication error are output, make sure of the vehicle equipment. When the vehicle is not equipped with the system the ASC-ECU communicates to, the diagnosis code is always output. This is not abnormal.

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