Test the solenoid using a handheld vacuum pump. Replace it to fix to problem. The valve should hold vacuum. Common problems, repair procedures and what to expect when tearing into one. The positive side is you've probably worked on these models for a long and know them well. Taking shop air with an external pressure regulator set to 5 psi is a good way to help find any small leaks. Test the solenoid using a handheld vacuum pump.
Remove power and ground to the solenoid. Check hoses and components of Secondary Air Injection System, for damage, loose fit and improper installation, check vacuum hoses for Secondary Air Injection System. A secondary air problem is not always caused by the secondary air system. With some vehicles, a slight engine hesitation upon acceleration may be noticed. Replace for a new one and retest. To test for carbon buildup: a.
It is either electric or turned by the drive belt. The enables both circuits simultaneously when Air system operations id desired. Thus, to test, one needs a data streaming tool during a cold startup. However, every common problem won't always have the same fix. Looks like this one needed some patience. The valve should hold a vacuum.
Common mistakes when diagnosing the P0411 code The most common mistake is made when unneccessary components are replaced within the air injection system - usually when parts are just clogged but have not actually failed. P0411 Secondary Air Injection System Incorrect Flow Detected, check the. P0411 is directly tied with an emissions control system. This is an actuator test. Movement of the diaphragm should be felt.
With the engine cold, start engine. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. Ensure fuse and secondary fuse secondary fuse is 40 amp and is located in fuse holder on top of battery are okay. Resistance should be a maximum of 1. Enter Address Word 01-Engine Management. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing. For a very long time I have had the infamous secondary air injection code thrown.
Specialized carbon cleaners are used to remove the carbon particles carefully. Part 06A 145 701N - Located just behind and to the left of the combination valve. The problem was found by actually disconnecting hose after hose and blowing smoke down them until we found the culprit. If voltage ground is present, but pump is still unable to run, then you may have a bad Air pump. Using scan tool, activate Secondary Air Pump Motor V101 in scan tool Output Diagnostic Test Mode Secondary Air Pump Relay activation mode. But after resetting the code, it would come back after about 30 miles.
I did not give up. Vehicle Application: 1998 Audi A4 Quattro 2. With a factory-compatible scan tool: a. If Combi-Valve opens when vacuum is applied, Combi-Valve is okay. In these cases, the parts most likely just need to be cleaned.
It shares a manifold vacuum source with the secondary air combination valve and under certain conditions prohibits the combination valve from opening. Secondary Air Pump Motor N101 wiring is okay, go to next step. If all previous tests pass, the issue could be a carbon buildup issue inside the cylinder head. This will set a P0411 secondary air incorrect flow code. I smoke tested the system. This causes the Check Engine Light to be set and displayed on the dashboard. Disconnect vacuum hose from Secondary Air Injection Valve N112 and disconnect pressure hose from secondary air pump motor, press buttons on pressure hose connector to disconnect pressure hose.