Audi Workshop Service and Repair Manuals

Testing sender voltage readings

• ‒ Disconnect the 8-pin plug on the throttle valve control part.

• ‒ Switch on ignition.
• ‒ → Measure voltage between contacts 4 and 7 on the 8-pin plug using hand-held multimeter V.A.G 1526.

Specification: at least 4.8 V

If the value is as specified, reconnect the 8-pin plug.

• ‒ Start the engine.
• ‒ Read measure value block (function 08) and select Display Group 98 .

The values in display zones 1 and 2 should be between 0.5 and 4.9 V.

• ‒ If the values are not as specified, switch off the ignition.

• ‒ Connect test box V.A.G 1598/22 to the wiring harness for the engine control unit
  => Page 24-10.

• ‒ Disconnect the 8-pin plug on the throttle valve control part.
• ‒ → Test for open circuit between the test box and the 8-pin plug using multimeter V.A.G 1526.

• ‒ Use the multimeter to test the wires for short circuits with each other.

• ‒ Rectify any open circuits and remove any dirt from the contacts. Erase fault memory and perform basic setting of throttle valve control part => Page 24-54.
• ‒ If the value is still not as specified, check the throttle valve for dirt and stiffness. Clean if necessary.
• ‒ Repeat basic setting of throttle valve control part => Page 24-54.
• ‒ If it is not possible to start the basic setting or if the procedure cannot be successfully completed, fit a new throttle valve control part.
• ‒ Perform basic setting of throttle valve control part => Page 24-54.
• ‒ If it is not possible to start the basic setting or if the procedure cannot be successfully completed, fit a new engine control unit
  => Page 24-10.