Volkswagen Jetta Secondary Air Injection Diagnosis Part 10 (DIY Diagnosis on Car)

Again, in this video, I will demonstrate how to troubleshoot the remaining components of the air injection system. First, I explain two methods of starting up the air pump. I will be using a fused jumper lead, a jumper and a test light method. Discussion is given about the short-comings of using a test light to energize devices. Also, I show the correct method of checking a relay contact which may be contrary to what you may have seen or learned. Then I show a method of how to confirm the combi valve is opening and closing without taking it off the car. Amperage checks are made on the air pump in a loaded and unloaded condition. Along with the amperage checks, I demonstrate the proper method of putting the clamp around the wire to ensure that you have the correct polarity shown even before you put the clamp on the wire. Also, to help improve your diagnostics skills, I've included some links below where two fella You Tubers are using test lights.

This is a two part series where Will Robinson of Robinson Auto is using a test light to help troubleshoot a Daytime Running Lights. The first part is located here:
   • Daytime running light circuit trouble...  

The second part is located here:
   • Part-2 Daytime running light circuit ...  

And Dave from his channel of Spelunkerd shows that test lights are not created equal. This video is located here:
   • Not all test lights are created equal  

Enjoy the video everyone, and be sure to leave your comments or questions if you have any.