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Hyundai connector issues

I had a good one a few weeks ago that I wanted to share. A Hyundai car was having ABS issues. The light was on and they couldn't communicate with the module. They checked for power and ground on the terminals to the module by back probing them and everything tested fine so they changed the module with a used one. The same problem was there. They sent it to the dealer and they said the used module was junk. The customer went and got another one and it did the same as the other two. The dealer told them they needed to buy a brand new one and it would be fixed. This is when I get the call to get involved. I test power and ground at the module and it is there. We unplugged all the sensors and checked wiring between the module and checked out fine. At this point I would have said bad module too. Then I remembered a problem I had with Hyundai O2 sensors. The plugs that mated together for the O2 sensor had pin grip issues. The pins in the plug didn't make a good connection. I asked the customer if the plug came with any of the used modules. One of them did. We took the plug and slid it onto the module and you could feel the difference between the plug from the cars wiring harness and the plug from the used unit. The used one was much tighter and slid on harder than the one wired to the vehicle. I advised the customer on how to splice the used connector into the vehicles harness. He called a few days later and said it worked. There are tools out there to test pin grip for most plugs and most people don't have them. If you are going to test electronics I strongly suggest buying a set. It could save you a lot of time and misdiagnosis.

7 Comments to Hyundai connector issues:

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Whale Watching in Cabo on Wednesday, March 20, 2019 3:10 PM
ABS issues are a mess. You should guide us the details while buying a used car. It will be helpful. thanks
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