General notes on ignition system

• This section deals specifically with ignition-related components. The other components of the injection and ignition system. Refer to General Notes on Fuel Injection  .
• 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.
• Engine Control Module (ECM) is equipped with On Board Diagnostic (OBD).

• Components marked with * are tested via On Board Diagnostic (OBD). Refer to 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. Refer to Diagnostic mode 3: Check DTC Memory 
• Erase DTC memory. Refer to Diagnostic mode 4: Reset/erase diagnostic data 
• Generate readiness code. Refer to Readiness code, generating 

Safety precautions. Refer to Safety precautions  .

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

Component locations of relays and fuses in protective housing (plenum chamber, left). Refer to Component locations of relays and fuses in protective housing (plenum chamber, left)