Diagnostic Function

DIAGNOSTIC FUNCTION
ASC-ECU has the following functions for easier system checks.
^ DTC set (Refer to Diagnostic Trouble Code Descriptions).
^ Service data output (Refer to Scan Tool Testing and Procedures).
^ Actuator test (Refer to Scan Tool Testing and Procedures).
^ Freeze frame data output (Refer to Check of Freeze Frame Data).
All the above items can be diagnosed using scan tool.

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 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.)