Reading and Clearing Diagnostic Trouble Codes

Diagnostic Trouble Code (DTC) memory for Engine Control Module (ECU), checking and erasing

When the DTC memory is erased the engine control module loses some learned values. Therefore it can lead to engine running malfunctions, depending upon the vehicle mileage.
If this is the case:
^ Perform a longer road test until poor driving characteristics are eliminated.

Special tools and equipment
^ VAS 5051 Vehicle Diagnosis, Testing and Information System
^ Diagnostic cable VAS 5051/1 or VAS 5051/3

Work sequence
^ Connect Vehicle Diagnosis, Testing and Information System VAS 5051 as follows:





^ Install connector of diagnosis cable VAS 5051/1 or VAS 5051/3 to diagnosis connection.
^ Start engine and run at idling speed.
Only when engine does not start:
^ Switch ignition on.

Select operating mode:
^ Press button on screen for "Vehicle self-diagnosis".

Select vehicle system:
^ Press button "01-Engine electronics" on screen.
The control module identification, the engine control module coding as well as the chassis number and immobilizer identification number are shown on the screen.

Note: A print-out can be produced if required. Press the "Print" button.

^ Press (arrow) key.

Select diagnostic function:
^ Press button "02-Checking DTC memory" on screen.
^ "No fault detected" appears on screen if no faults are stored in engine control module.
^ If faults are stored in engine control module they will appear on screen listed one below another.
^ Press (arrow) button.
^ Press button "05-Erase DTC memory" on screen.
^ Press function 06-"End output".

Note: Generate the readiness code if an emissions test is to be performed after erasing the DTC memory, Refer to Engine Control Module, Description and Operation