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I have a V70 Mk 1 and I have always been able to read codes…

Hello, I have a...

Hello, I have a V70 Mk 1 and I have always been able to read codes with an autel MD702 scanner all of a sudden it is unable to communicate with th ECU and an engine light is on

Mechanic's Assistant: Has your vehicle stalled? Has anyone run a diagnostic test to pull the trouble code?

I have been to a couple of independents and they were unable to fully communicate with the car but I am aware that it can be a difficult car because of its age

Mechanic's Assistant: What year is your V70?

1997

Mechanic's Assistant: Are you fixing your V70 yourself? What have you tried so far?

I have used the Autel scanner in the past to diagnose issues and turn service light off etc had to replace abs module which is commonplace on this vehicle

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Front cigarette lighter has failed but the fuse is okay - someone mentioned this may be relevant to the comms issue but I think its a red herring

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Answered in 4 hours by:
1/14/2018
sprinkles08
sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 24,068
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer! I apologize for the extended wait time you experienced, I've only just come online now and would like to assist you with your question.

If communication with the engine controller isn't possible using multiple known good scan tools there are several possible causes and it will require some electrical testing to determine exactly what is wrong.

It could be a connection issue at the data link connector.

It could be a bus communication issue. If there are no other warning lights on then the bus isn't down entirely, but there may be an open circuit between the data link connector and engine controller.

The problem may be an internal failure in the engine controller itself.

My goal is to give you the best experience possible! I hope I have earned a 5 star rating! Please remember to rate my service by selecting the 5 stars at the top of the screen before you leave today. If you need more assistance, please use the reply box and let me know.

sprinkles08
sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 24,068
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified
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