A4 Quattro Wagon L4-1.8L Turbo (ATW) (2000)
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The Secondary Air Injection (AIR) pump relay (in 3-socket relay carrier in the E-box, at left in plenum chamber, position 2) must trigger and
the Secondary Air Injection (AIR) pump motor 4101- must run in intervals
A - If relay does not trigger:
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Check voltage supply of Secondary Air
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Injection (AIR) relay.
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Checking activation of Secondary Air Injection (AIR) relay.
B - If relay triggers, but Secondary Air Injection (AIR) pump does not run:
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Check voltage supply for Secondary Air Injection (AIR) pump.
Checking voltage supply of Secondary Air Injection (AIR) pump relay
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Remove Secondary Air Injection (AIR) pump relay.
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Connect multimeter for voltage measurement as follows.
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Specified value: approximately battery voltage
If specified value is not obtained:
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Perform the following tests marked with dots: