Testing power output stage: Audi 2.0 (ABK, ADW)

ADW
Special tools, testers and auxiliary equipment required

Hand-held multimeter V.A.G 1526 or V.A.G 1526 A
Voltage tester V.A.G 1527 B
Adapter set V.A.G 1594 A
Test box V.A.G 1598/18

Test requirements:

Ignition coil OK; checking =>Page
28-17
.

Testing power supply

Unplug the connector from the power output stage and the main ignition wire from the ignition coil.
Set hand-held multimeter V.A.G 1526 to voltage measuring range (20 V direct current) and connect it as follows using test leads from V.A.G 1594 A.
Between contact 1 (positive) and engine earth
Between contact 1 (positive) and contact 3 (earth)

Switch the ignition on.
Specification: approx. battery voltage

If the specification is not obtained:

Eliminate open circuit or short circuit using the current flow diagram.

Testing actuation

Test requirements:

Hall sender OK, checking => Page
28-13
.

Remove fuse 17 (the fuel pump must not run when starting the engine otherwise the catalytic converter may be damaged).

Connect voltage tester V.A.G 1527 B between contact 2 (signal) and 3 (earth) of the connector using auxiliary wires from V.A.G 1594.
Operate starter.
The LED should flash.

If the LED does not flicker:

With the ignition switched off, connect test box V.A.G 1598/18 to connector for engine control unit => Page
24-16
.

Test for open circuit in the following wiring connections:

Connector / for -N70 / Contact · Test box / V.A.G 1598/18 / Socket
2 · 7

Rectify open circuit, if necessary
In addition, test the Hall sender => Page
28-13
.
If the wiring and Hall sender are OK, fit a new Digifant control unit => Page
24-18
.

Notes:

After replacing the Digifant control unit, it is necessary to adapt the control unit and throttle valve potentiometer to each other => Page
24-92
.
After replacing the Digifant control unit on vehicles fitted with an automatic gearbox, it is necessary to adapt the automatic gearbox control unit and the throttle valve potentiometer to each other => Page
24-93
.

If the LED flickers:

Switch off ignition.
Plug in the connector and the ignition wire at the ignition coil again.

Connect voltage tester V.A.G 1527 B to contacts 1 and 15 of the ignition transformer using auxiliary wires and terminals.

Warning
During the following test do not touch the terminals of the ignition transformer or test wires.
Operate starter.
The LEDs should flash.

If LED does not flash:

Fit a new ignition coil with output stage.