Diagnosis of module components

The components of the diagnostic module for tank leak tests are diagnosed through the DME. If a relevant fault occurs during engine operation, the corresponding fault will be entered in the fault memory for the DME. The following faults can thereby be diagnosed:

• Activation of electromagnetic changeover valve
• Activation of pump motor
• Module fault
• Activation of heating, diagnostic module for tank leak testing

The diagnostic program provides the option to initiate the system test through the DIS tester.