Checking For Voltage

Checking for voltage confirms that the circuit is uninterrupted between the voltage source and the test point. The example illustrates troubleshooting the high-speed circuit for the radiator cooling fan.

Voltage: If the test light or multimeter indicates voltage potential, then the circuit between the voltage source and terminal 1 of the fan connector is OK.

NO Voltage: Power is not reaching the fan connector. The fan is probably OK. Look for a fault somewhere between the voltage source and the fan connector.
Example: Check for voltage reaching terminal E87La of the fuse/relay panel

CAUTION: Direct contact with meter probes at the connector terminals can easily damage the small contacts, causing poor connections and risking future intermittent faults.

Audi Special Tools include adapters for making test connections safely and preventing connector damage. Tools and Equipment