A4 Sedan V6-2.8L (AFC) (1996)
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Switch ignition on.
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Connect VAG 15278 voltage tester between relay panel sockets 2 and 4.
NOTE: Voltage tester with low current draw will have a dim light.
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Use scan tool "Output Diagnostic Test Mode" function O3 to trigger Secondary Air Injection (AIR) pump relay -J299-.
Voltage tester LED must light up brightly for about 10 seconds when triggering the relay.
If the LED lights brightly after triggering (triggering OK):
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Replace secondary air injection pump relay -J299-.
If the LED lights up brightly or does not light up at all:
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Connect test box VAG 1598/19 to wiring harness.
If the voltage tester LED lights up constantly:
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Check wiring between relay panel socket 4, test box socket A18, and Ground (GND) connection.
If voltage tester does not light up at all:
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Check wiring for continuity between relay panel socket 4 and test box socket A18.
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If necessary eliminate ground connection or break in wiring.
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If there is no break in wiring, replace ECM.