General notes on ignition system

• This section deals specifically with ignition - related components. For the other components of the injection and ignition system, see  MULTIPORT FUEL INJECTION (MFI)  .
• For the electric components to work properly, a voltage of at least 11.5 V is required. 
• The battery must only be disconnected and connected with the ignition switched off, since the Engine Control Module (ECM) can otherwise be damaged. 
• The Engine Control Module (ECM) is equipped with an On Board Diagnostic (OBD) 
• Components marked with * are tested via On Board Diagnostic (OBD), see  DIAGNOSTIC MODE 3: CHECK DTC MEMORY 
• It is possible that the control module will recognize a malfunction and store a DTC during some tests. Therefore the following work steps must be performed in the mentioned sequence after ending all tests and repairs. 

• - -Check DTC memory, see  DIAGNOSTIC MODE 3: CHECK DTC MEMORY 
• - - Erase DTC memory, see  DIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA 
• - - For completion, generate readiness code, see  READINESS CODE, GENERATING  .

Parts of ignition, removing and installing:

• Vehicles with engine code AEB, see PARTS OF THE IGNITION, REMOVING AND INSTALLING (VEHICLES WITH ENGINE CODE AEB) 
• Vehicles with engine code ATW, AUG, AWM, see PARTS OF THE IGNITION, REMOVING AND INSTALLING (VEHICLES WITH ENGINE CODE ATW, AUG, AWM) .

Safety precautions, see SAFETY PRECAUTIONS .

Test data, spark plugs, see TEST DATA, SPARK PLUGS .