Audi Workshop Service and Repair Manuals

The injection system is supplied with voltage via the diesel direct injection system relay -J322.

A prerequisite for making the main contacts at the relay -J322 is application of voltage via terminal 15 at the diesel direct injection system control unit. In other words, relay -J322 is only connected to earth (via diesel direct injection system control unit) when voltage is being applied to the control unit by way of terminal 15.

Test prerequisite:

• ● Battery voltage OK

Testing voltage supply, terminal 15

• ‒ → Pull diesel direct injection system relay -J322 out of relay frame 3 (auxiliary relay plate in E-box).
• ‒ Connect up test box
• ‒ Switch on ignition.
• ‒ Activate 20 V measuring range.
• ‒ Use hand-held multimeter V.A.G 1526 to measure voltage between following contacts:

• Desired value: approx. battery voltage

• Desired value: approx. battery voltage 1)

1) With engine code AFF and AFN, battery voltage must also be applied to relay frame 3, contact 1 with "Ignition off".

• ‒ If the desired values are not attained, check cable connections.

=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations binder

Testing earth actuation of diesel direct injection system relay -J322

Test prerequisite:

• ● Voltage supply, terminal 15 OK

• ‒ Remove cover of E-box.
• ‒ Switch on ignition.

• → Desired value: Diesel direct injection relay -J322 at relay position 3 must be energised.

Note:

Clicking of the relay is not easy to hear and can thus be best felt by touching the relay.

• ‒ If relay does not energise, switch off ignition.
• ‒ Connect up test box => Page 23-37
• ‒ Use auxiliary lead from V.A.G 1594 to connect following sockets of test box.

• ‒ Switch on ignition.

• Desired value: Diesel direct injection relay -J322 at relay position 3 must be energised.

• ‒ If relay is now energised, replace control unit for diesel direct injection system -J248 => Page 23-38.
• ‒ Switch off ignition if relay does not energise.
• ‒ Pull relay out of relay frame 3.

Check following cable connections for short circuit to positive/negative and breaks.

• ‒ If applicable, eliminate cable break/short circuit.
• ‒ If there is neither a cable break nor a short circuit, replace diesel direct injection system relay -J322.

Testing voltage supply, terminal 30

Test prerequisites:

• ● Voltage supply, terminal 15 OK
• ● Earth actuation of relay -J322 OK.

• ‒ Connect up test box => Page 23-37
• ‒ Use auxiliary lead from V.A.G 1594 to connect following sockets of test box.

• ‒ Activate 20 V measuring range.
• ‒ Connect hand-held multimeter V.A.G 1526 between following test box sockets.

• ‒ If desired values are not attained, check cable connections.

=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations binder

• ‒ If there is neither a cable break nor a short circuit, replace diesel direct injection system relay -J322.