Engine Control Module (ECM) power supply checking: Checking
- Connect VAG 1598/19 test box to Engine Control Module (ECM) harness connector. See VAG1598/19 TEST BOX, CONNECTING .
- 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.