Audi Workshop Service and Repair Manuals

Special tools,
testers and equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598 A
• ◆ V.A.G 1598/11

Fitting location => Fitting locations overview, Page 24-6

Note:

Checking operation=> Reading measured value block display group 001, Page 01-100.

Checking internal resistance

• ‒ Unplug connector on coolant temperature sender.
• ‒ → Connect multimeter to contacts 1 and 3 of sender to measure resistance.

Scale A shows resistance values for temperature range 0...50 °C and scale B the values for temperature range 50...100 °C.

→ Examples:

• ◆ 30 °C corresponds to a resistance of 1500...2000 ω
• ◆ 80 °C corresponds to a resistance of 275...375 ω

If the specifications are not obtained:

• ‒ Renew coolant temperature sensor.

Checking wiring

• ‒ → With the ignition switched off, use adapter V.A.G 1598/11 to connect test box V.A.G 1598 A to connector C only of engine control unit (control unit remains disconnected) .

• ‒ → Check for open circuit and short to earth/positive or earth in the following wiring connections:

• ‒ Rectify short circuit or open circuit if necessary.

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

• ‒ If the wiring is OK, fit a new engine control unit => Page 24-20.