audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

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Disconnect voltage supply relay -3-.

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Check the following wire connection for open circuit according to wiring diagram:

Relay carrier in E-box,

Harness connector at ignition

plenum chamber, position

coils Terminal

3 Terminal
8

1

Specified value: Wire resistance max 1.5 Ohms

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If necessary, repair wire connection.

If no malfunctions are found in wires:

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Check voltage supply of Motronic Engine Control Module (ECM) voltage supply relay -J271-

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Check activation of Motronic Engine Control Module (ECM) voltage supply relay -J271-

Checking voltage supply

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Connect multimeter for voltage measurement as follows.

Relay carrier in E-box,

Measure to

plenum chamber, position
3 Terminal
1

Engine Ground (GND)

2

Engine Ground (GND)

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Specified value: approx. battery voltage

If specified value is not obtained:

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Check wire connections for open circuit according to wiring diagram.

Specified value: Wire resistance max 1.5 Ohms

Checking activation

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