audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Not Available For Manufacturer's Scan Tool|Page 3990 > < Not Available For Manufacturer's Scan Tool|Page 3988
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If specified value is obtained:

Checking voltage supply

-

Connect e.g. V.A.G 1527 B voltage tester as follows:

Harness connector

Measure to

Terminal

2

Engine Ground (GND)

-

Switch ignition on.
-

LED must light up.

-

Switch ignition off.

If LED does not light up:

-

Check wire connection from terminal 2 of harness connector via fuse to Motronic Engine Control Module (ECM) Power Supply Relay -J271- for
open circuit according to wiring diagram:
-

Specified value: Wire resistance max 1.5 Ohms

-

If necessary, repair wire connection.

 
If voltage supply is OK:

Checking control wire

-

Connect test box to wiring harness of Engine Control Module (ECM); ECM is not connected. See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test
Box, Connecting For Wiring Testing

-

Check the following wire connections for open circuit according to wiring diagram:

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