Audi Workshop Service and Repair Manuals

Testing actuation of power output stages

• ‒ Pull the connectors off all four injectors.

Note:

It is important to ensure that no fuel is injected during the test, as this would damage the catalytic converter. Therefore, the connectors must be withdrawn from the injectors.

• ‒ Remove the 5-pin connector from the power output stage => Overview of installation locations - Page 24-4.

• ‒ → Connect the V.A.G 1527 diode test lamp to the following contacts on the connector:
• ‒ Operate the starter for a few seconds.

If the specified results are not obtained:

• ‒ Switch off ignition.
• ‒ Connect the V.A.G 1598/22 test box to the wiring harness for the engine control unit.
  =>Page 24-6.

The following wiring connections should be checked for open circuits and/or short to positive or negative.

• ‒ Rectify short circuit or open circuit if necessary.

If no fault is detected in the wiring:

• ‒ Connect the 5-pin connector to the power output stage.
• ‒ Pull the 4-pin connector off the power output stage.

• ‒ Connect the V.A.G 1527 diode test lamp to battery positive (+) and to one of the contacts on the 4-pin connector on the power output stage.
• ‒ Operate the starter for a few seconds.

• Diode test lamp should flash.

• ‒ Carry out the test with all 4 contacts on the power output stage.

• The diode test lamp should flash each time.

If the diode test lamp does not flash when testing one or more of the contacts:

• ‒ Renew power output stage.