A4 Cabriolet L4-2.0L Turbo (BWT) (2007)
![background image](/audi/a4_cabriolet/l4-2.0l_turbo_(bwt)/Page-1086001.png)
Engine Control Module: Testing and Inspection
Engine Control Module Voltage Supply, Checking
Engine Control Module Voltage Supply, Checking
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› wiring diagrams.
Test requirements
‹› Fuse Strip (S88) OK.
‹› Fuse (S102) OK.
‹› Motronic Engine Control Module (ECM) Power Supply Relay (J271) OK.
‹› The Ground (GND) connections at the engine and transmission OK.
‹› The battery voltage at least 12.5 V.
‹› The generator OK.
Test procedure
-
Perform a preliminary check to verify the customers complaint. Refer to => [ General Diagnosis ] See: Computers and Control Systems/Testing
and Inspection/Initial Inspection and Diagnostic Overview/General Diagnosis.
Start diagnosis
If the manufacturers test box is being used. Perform the following step.
-
Install the test box. Refer to Fuel Injection and Ignition Repair Information
If the manufacturers test box is not being used. Perform the following step.
-
Remove the Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Replacing ] See: Service and Repair.
Checking voltage supply
-
Using a Multimeter, check the following wiring connection for voltage.
Specified value: 12.5 V
If the specified value was not obtained:
-
Check the Engine Control Module (ECM) (J623) electrical harness connector terminal T94/65 to the Battery (A) (+) for an open circuit or short to
Ground (GND).
-
Check the electrical harness connectors for damage, corrosion, loose or broken terminals.
-
If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
Checking switched voltage supply
-
Switch the ignition on.