General notes on ignition system
WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
- Switch off the ignition before connecting or disconnecting the battery, otherwise the engine control module may be damaged.
- A voltage of at least 12.7 V is necessary for satisfactory functioning of the electrical components.
- During some of the tests, a malfunction may be recognized and stored by the control module. At the end of all tests and repairs, the DTC memory should be checked and, erased.
- If the engine starts and then stops after malfunction search, repair or tests on components, because the immobilizer is blocking the engine control module. The DTC memory must then be checked and, if necessary, the control module adapted.
WARNING:
- Safety precautions before disconnecting battery:
Refer to
- 27 BATTERY, STARTER, GENERATOR, CRUISE CONTROL
- 27 BATTERY, STARTER, GENERATOR, CRUISE CONTROL for ELECTRICAL EQUIPMENT, CABRIOLET
- Always switch ignition off before disconnecting or connecting battery. Failure to do so may damage a control module.