Engine Control Module: Testing and Inspection

ENGINE CONTROL MODULE VOLTAGE SUPPLY, CHECKING

Special Tools, Testers And Auxiliary Items
- VAG 1551/1552 scan tool with VAG 1551/3 adapter cable
- VAG 1598/18 test box
- Multimeter (Fluke 83 or equivalent)
- Connector test kit VW 1594
- Wiring diagram

Test Sequence
- Connect VAG 1551/1552 scan tool and select "Engine Electronics" address word 01. When doing this the ignition must be switched on. Refer to "On-Board Diagnostics II With VAG 1551". Testing and Inspection

Indicated on display

Rapid data transfer HELP
Select function XX

- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.

Indicated on display

Read Measuring Value Block HELP
Input display group number XXX

- Press buttons -0-, -0- and -2- for display group 002 and press -Q- button to confirm input.

Indicated on display (1-4 = Display fields)

Read Measuring Value Block 2 ->
1 2 3 4

- Check the battery voltage (display field 3).





- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.

Evaluating Display Group 002:

Checking Voltage Supply Terminal 30
- Switch ignition off.





- Connect VAG 1598/18 test box to ECM wiring harness. Connect multimeter using test leads from VW 1594 to measure voltage at sockets 1 and 54:

Specification: 12-14.5 volts

If the specification is not attained:
- Check wiring according to wiring diagram.

Checking Voltage Supply Terminal 15
- Switch ignition off.
- Connect VAG 1598/18 test box to ECM wiring harness.
- Switch ignition on.
- Connect multimeter using test leads from VW 1594 to measure voltage at sockets 1 and 23:

Specification: 12-14.5 volts

If the specification is not attained:
- Check wiring according to wiring diagram.