Measuring No-Load Voltage, Transport Mode Not Active

Measuring No-Load Voltage, Transport Mode Not Active

Special tools, testers and auxiliary items required

• Hand-Held Multimeter (V.A.G 1526E)

It is not possible to check the battery using "Guided Fault Finding" during the following procedures because the vehicle has a battery monitoring control module (J367) but not a Data Bus On Board Diagnostic Interface (J533) :

• Audi A3 from MY 04 (8P)

• Audi TT from My 07 (8J)

• Audi R8 from MY 07 (42)

Battery test, refer to => [ Battery, Checking - Vehicles Without Battery Monitoring Control Module (J367) or Energy Management Control Module (J644) ] Battery, Checking - Vehicles Without Battery Monitoring Control Module (J367) or Energy Management Control Module (J644).

• The no-load voltage measurement should only be used to evaluate the battery condition if it is not possible to perform the battery test with the Vehicle Diagnostic Tester and if the transport mode is not activated in the battery monitoring control module (J367) or energy management control module (J644).

Procedure

- Always observe the following to ensure correct measurement:

• Battery remains installed in vehicle, battery ground (GND) strap must not be disconnected.

• Open the front lid or rear lid and lock the lid lock in the closed position so that the luggage compartment lamp is not switched on.

• Lock vehicle with central locking system.

• Battery must not be loaded by electrical consumers within the next 2 hours before measurement.

• Battery must not be charged within the next 12 hours before measurement.

• The battery temperature must be at least -10 °C (14 °F).

- Perform the prep work for the no-load voltage measurement.

After a waiting period of at least 2 hours:

- Connect the (V.A.G 1526E) between the battery terminal clamps or to the positive terminal "+" and ground terminal "-".

- Measure the voltage between the battery terminal clamps.

• Specified value: 12.5 volts or higher, the battery is OK.

- If the no-load voltage is under 12.5 volts, the battery must be recharged. Refer to=> [ Charging The Battery Using ] Charging the Battery Using (VAS 5903).

- After charging for 5 minutes, the current draw must be measured again. Refer to=> [ Current Draw Test ] Current Draw Test.

- If the battery no-load voltage is 11.6 volts or lower, the battery is exhaustively discharged. Refer to=> [ Exhaustively Discharged Battery ] Exhaustively Discharged Battery.