WL-C Engine Control System
On-Board Diagnostic System
Features
• The OBD (On-Board Diagnostic) system has the following features:
– MIL
– Self test
– PID monitor
– Simulation test
Malfunction Indicator Lamp
• The MIL is located in the IC. It illuminates when emission related malfunction have been
detected by the OBD system. In this case a corresponding DTC is stored in the PCM.
The glow plug indicator light has no indication function for any detected malfunction as
on the B-series.
Self Test
• The self-test function allows reading out DTCs of the PCM. Therefore connect the M-
MDS to the DLC-2 of the vehicle and select the option ToolboxÆSelf TestÆModulesÆ
PCM ÆRetrieve CMDTCs.
• In addition the KOEO (Key On, Engine Off) self-test and the KOER (Key On, Engine
Running) self test can be performed. Therefore connect the M-MDS to the DLC-2 of the
vehicle and select the option ToolboxÆSelf TestÆModulesÆPCMÆKOEO/KOER On
Demand Self Test.
NOTE: The self-test function cannot be carried out by using DLC-1.
Service Training BT-50 01-51
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