Engine - MIL ON/DTC P0411 Stored in Memory

Condition
Malfunction Indicator Lamp (MIL) ON DTC P0411 (16795) Stored in DTC Memory





01 07 11 Jan. 25, 2007, 2002045, supersedes Technical Bulletin Group 01 number 00-08 dated Dec. 19, 2000 due to inclusion in ElsaWeb.

Technical Background
MIL is ON with DTC P0411 (16795) "Secondary air system incorrect flow detected" stored in DTC memory.

May be caused by a faulty charge pressure bypass valve, since both the charge pressure bypass valve and the combi-valve for secondary air system share a common vacuum source.

If charge pressure bypass valve does not hold vacuum, there will not be enough vacuum during secondary air diagnosis to open the combi-valve, and the system stores DTC P0411 (16795) "Secondary air system incorrect flow detected" in DTC memory.

Production Solution
N/A

Service
Check charge pressure bypass valve as follows:

- Remove upper engine cover.





- Disconnect vacuum line at bypass valve (arrow).
- Connect hand vacuum pump (or equivalent) to bypass valve. See Required Parts and Tools.
- Operate vacuum pump to achieve at least 15 in. Hg (vacuum).

System should hold at least 15 in. Hg (vacuum).
If system holds at least 15 in. Hg (vacuum):
- Continue to diagnose DTC P0411 using Guided Fault-Finding.
If system does not hold at least 15 in. Hg (vacuum):
- Replace charge pressure bypass valve.
- Clear any stored DTCs.
- Install upper engine cover.

Warranty
Information only

Required Parts and Tools





No special parts required