Allroad Quattro V8-4.2L (BAS) (2004)
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Connect test box V.A.G. 1598/31 to wiring harness connectors. Actual engine control module is not to be connected. Connect ground clip of test
box to ground (not shown in Fig.).
CAUTION: So as not to destroy electronic components, select required measuring range before connecting test leads and observe test conditions.
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Check for open circuit and short to ground/positive in the following wiring.
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Use wiring diagram to eliminate open circuit in wiring/short circuit.
If no fault is found:
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Replace secondary air injection (AIR) pump relay -J299-.
Checking power supply for secondary air injection (AIR) pump motor
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Unfasten quick-release fasteners -1- and -2- and detach front noise insulation. Leave rear noise insulation in position.
