Motronic Engine Control Module Power Supply Relay -J271-, CHECKING: Function

The following procedure is used to diagnose the Motronic Engine Control Module Power Supply Relay -J271- and the Engine Control Module -J623- power supply voltage that is provided by the Motronic Engine Control Module Power Supply Relay -J271-.

Special tools and workshop equipment required 

• Multimeter.
• Wiring Diagram.
• Scan Tool.