Opinions on No Start diagnosis

Nolan Technician Bahamas Posted   Latest   Edited  

Just thought I would put this out there, yesterday I was called out to take a look at this no-starting VW turbo beetle convertible, the shop put a battery in it and I confirmed it was a no-start. When I turned the key to the on position I didn't see a check engine light so I did my visual inspection and checked all fuses in the hood and at the end of the dashboard. Then I think it was time to put the scan tool on it and do a health check I found no communication codes with the ABS and the PCM. So decided to try the easiest module to access first and seeing that they had their mechanic right there I asked if he could unplug the ABS module first he did but I still got no comms with the PCM. Now this narrows it down a bit, so l would think the only next place to go would be to the PCM so l asked again if the mechanic could access the PCM for me he did…and guess what we saw, it looked to me like muck all around the module and two ground wires looked like rats had been at them . I asked the shop owner if he knew was the car laid up for a while he said most likely. We plugged the ABS module back in and I scanned the car again and this time the ABS module had communications . Just wondering with everyone who read this story what could I have done to better my diagnostics, please I am looking for any and all inputs thanks so much for your time.

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Glenn Owner/Technician
Texas
Glenn
 

Hi Nolan, Did they repair the issue and have you confirm no other issues? It is important to confirm your findings. There is often other issues and a shop/customer is happy to claim it is warranty since you touched the vehicle. If they do not want you to go any further, have them sign a waiver releasing you from any liability.

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Nolan Technician
Bahamas
Nolan
 

That is good to know , and yes the shop does not want me to go any further with any more diagnostics. I will be sure to do that in the future thank you very much.

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Rod Diagnostician
California
Rod
 

Sounds like they gave you an incomplete story on vehicle history. When that happens there is nothing you did wrong .

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Matthew Owner/Technician
Oregon
Matthew
 

I think you did well. With limited information on the vehicle and not your customer so you don't have their information you showed up and completed the diagnosis without a bunch of extra steps. Easiest first. Unless there's a splice pack that's the best route to go. All to often we get stuck on most likely, and it didn't do anything but help your diagnosis unplugging another module.

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Eric Manager
Arizona
Eric
 

I don't think there is much you could have done different. Very common to have a module pull down communication circuits. What you did is what I would have done. Access easiest module and continue from there. Fortunately for you there were only two modules down. Have had 5-6 at a time and sometimes takes multiple hours to access. The next thing would be to repair any wires and then see if PCM…

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Nolan Technician
Bahamas
Nolan
 

Thank you for the reply, well we all are coming back online now that it seems our curfews are over. It's eighty degrees F a little windy the drinks are cold and the food is spicy always a good time.

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