General notes on ignition system

• Only the components which specifically relate to the ignition system are dealt with here. For the other components of the injection and ignition system. Refer to .Component locations, overview 
• The engine control module is equipped with On Board Diagnostic (OBD).
• Components marked with * are checked via the On Board Diagnostic (OBD). Refer to DTC memory of Engine Control Module (ECM), checking (scan tool function 02) and erasing (scan tool function 05)  .
• For trouble-free operation of the electrical components a voltage of at least 11.5 V is necessary.

• During some checks it is possible that the control module will recognize and store a trouble code. Therefore after completing all checks and repairs the Diagnostic Trouble Code (DTC) memory must be checked and, if necessary, erased. Refer to DTC memory of Engine Control Module (ECM), checking (scan tool function 02) and erasing (scan tool function 05)  .

Safety precautions. Refer to Safety precautions 

Test data, spark plugs. Refer to Test data, spark plugs