Audi Workshop Service and Repair Manuals

• ‒ Read measured value block, display group 07, cold engine, idling

• ‒ Check display in display zone 4 (coolant temperature).

• Specified value: The temperature reading should increase at a uniform rate.

If there is a fault the fuel temperature will be displayed as a substitute value.

If an implausible value is displayed in display zone 4, or if the fuel temperature is displayed as a substitute value:

• ‒ Switch ignition off.
• ‒ → Unplug the connector from the sensor => Fitting locations overview, Page 23-4.
• ‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit; do not connect the engine control unit => Page 23-32.

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

• ‒ Rectify any open/short circuit as necessary.

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

If no wiring fault is detected:

• ‒ Replace coolant temperature sender (G62).