90 Quattro Sport V6-2.8L (AFC) (1995)
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Connect VAG 1527B voltage tester between relay socket terminals 2 and 4.
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LED must dimly light up.
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Initiate output DTM and actuate AIR pump relay -J299-. Refer to On-Board Diagnostics. See: Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures/Output Diagnostic Test Mode (DTM)
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LED must brighten up for approximately 10 seconds, then dim again.
If LED lights up brighter after actuation (actuation OK):
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Replace secondary air injection pump relay -J299-.
If LED lights up brightly the entire time or does not light at all:
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Check wiring to relay.
CHECKING WIRING TO RELAY
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Connect VAG 1598 test box to wiring harness using adapter cable VAG 1598/11. Refer to VAG 1598 Pin Out Box Connecting. See:
Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/Scan Tool Connecting and
Initial Checks/Connecting VAG 1598/31 Test Box
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The adapter harness for ECM is not connected.
If LED lights up continuously bright during relay actuation:
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Check wiring for short circuit to Ground (GND) between relay panel terminal 4 and VAG 1598 test box socket 6.
If LED does not light up during relay actuation:
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Check wiring for continuity between terminal 4 and VAG 1598 test box socket 6.
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If necessary, repair short circuit to GND or open circuit in wiring between relay panel terminal 4 and ECM connector C terminal 6.
If wiring is OK:
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Replace ECM.