A4 Quattro Wagon L4-1.8L Turbo (ATW) (2000)
Air Injection Control Valve: Customer Interest
Attachment Bulletin # 010206
Group: 01
Number: 02-06
Date: June 25, 2002
Subject:
Malfunction Indicator Lamp (MIL) ON, DTC P0411 Stored in DTC Memory
Model(s):
A4 1.8T
2000, 2001
(Eng. Codes ATW, AWM)
Condition
MIL is ON, Diagnostic Trouble Code (DTC)
P0411 "Secondary air system incorrect flow detected" is stored in DTC memory.
DTC P0411 may indicate a general fault in the Secondary air system.
Service
Suggested diagnostic procedure:
^
Vacuum line from Combination valve must be OK.
^
Supply line from Secondary air pump to Combination valve must be OK.
^
Relay for Secondary air pump checks as OK.
-
Check the Combination valve with a vacuum pump.
If valve does not open or will not hold vacuum:
-
Replace Combination valve (See Repair Manual, 1.8 Liter 4-Cyl 5V Turbo Engine Mechanical, Repair group 26 - Exhaust system, Emission controls
Secondary air system, Secondary air system, function/components).
If valve opens and holds vacuum:
-
Check intake side of Combination valve.