Control Module Power Supply, Checking

Control Module Voltage Supply, Checking

Test requirements:
- Fuse for Engine Control Module (ECM) OK
- Battery voltage at least 11 V
- Generator OK

- Connect test box VAG1598/31 to wiring harness for engine control module. Do not connect to the engine control module itself. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" Testing and Inspection
- Switch ignition on.


NOTE:
- The B+ voltage supply for the engine control module comes via terminal 3 (terminal 15) and terminal 62 (terminal 30).
- The Ground (GND) connection for the engine control module is via terminals 1 and 2.


- Connect hand-held multimeter VAG1526 (voltage measurement range) to the following contacts on the test box:

Contact Specification
3+2 approx. battery voltage
3+1 approx. battery voltage
62+2 approx. battery voltage

If the specifications are not obtained:
- Check wiring.