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Servicing Motronic injection system
Exhaust warning lamp -K83 in dash panel insert
If the engine control unit detect faults which result in deterioration of exhaust emission values, these faults will be indicated by illumination of exhaust gas warning lamp.
After switching on the ignition the engine control unit switches on the EPC warning lamp. Shortly after starting the engine the exhaust warning lamp goes out if the engine control unit does not detect a fault which causes the exhaust emission values to deteriorate and if actuation of the lamp by the engine control unit is ok.
If faults which cause the exhaust emission values to deteriorate are detected when operating the engine the engine control unit switches on the exhaust warning lamp. (These faults are listed in the fault table). At the same time, an entry is made in the engine control unit fault memory.
When switched on, the exhaust gas warning lamp may flash or illuminate constantly. In any case, the fault memory must be interrogated .
Flashing:
A fault is present which under these driving conditions will cause damage to the catalytic converter (e.g. misfiring). In this case driving may only continue at reduced power.
Continuous:
A fault is present which causes deterioration of the exhaust emission. Interrogate fault memory for Motronic-control unit or automatic gearbox (if available).
If there is an engine running problem or a customer query and the exhaust warning lamp is not illuminated the fault memory must be interrogated. Faults which do not switch on the exhaust warning lamp immediately but only after recognising the fault after restarting the engine can also be stored.
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