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Checking power supply

Connect multimeter as follows to measure voltage.

ECM POWER SUPPLY RELAY CIRCUIT TEST: POWER SUPPLY

Relay carrier in electronics box, plenum chamber, position 2 terminal	Measure to
1	Engine ground
2	Engine ground

Fig 1: Identifying Power Supply Relay Harness Connector Terminals

Courtesy of AUDI OF AMERICA, INC.

Specified value: approx. battery voltage

If specified value is not obtained:

Check wiring connections.