Engine Control Module (ECM) Power Supply, Checking

Engine Control Module (ECM) Power Supply, Checking

Test conditions
- Fuse for fuel injectors OK (E-box in plenum)
- Motronic Engine Control Module (ECM) power supply relay -J271- OK.

Checking







- Connect VAG1598/19 test box to Engine Control Module (ECM) harness connector. Refer "Scan Tool Testing/Scan Tool Connecting and Initial Checks/VAG1598/19 Test Box, Connecting" Testing and Inspection
- Connect VAG1527B LED voltage tester between ECM/test box socket D9 (permanent B+) and, one after the other in sequence, test box sockets D11, E7, E11 and E12 (Ground connections).
LED must light up in each case.

If LED does not light:
- Check wiring and connections for open circuit and repair as necessary.
- Connect VAG1527B LED voltage tester between ECM/test box sockets E7 (Ground) and B3 (Ignition, +, terminal 15).
- Switch ignition on.
LED must light up.
- Switch ignition off.

If LED does not light:
- Check wiring and connections for open circuit and repair as necessary.