Audi Workshop Service and Repair Manuals

Functional check on control lamp

• ‒ Switch the ignition on.
• ‒ The fault lamp for self-diagnosis (exhaust warning lamp) must illuminate.
• ‒ Start the engine.
• ‒ Shortly after starting the engine the exhaust warning lamp goes out if no exhaust emission relevant fault is stored in the fault memory.

Note:

The switch-on signal for the fault lamp is transfer via CAN bus to the dash panel insert by the engine control unit. Check the data exchange between engine control unit and other CAN-control units =>Page 24-171