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Enes
Enes, VOLVO Master Technician
Category: Volvo
Satisfied Customers: 4903
Experience:  15+YEARS WITH VOLVO AS THE MASTER VOLVO MECHANIC&Ase
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I am diagnosing a problem with my 04 xc90. I bought it

Customer Question

I am diagnosing a problem with my 04 xc90. I bought it recently non running.. The car will turn over, but not start. I have fuel pressure at the rail, so not a fuel issue. Ive read that ecu failures are common and am thinking this is my problem. While attempting to pull OBD codes with a small reader, I kept getting a "no link" message on the reader. Then it would read.. Am I on the right path?
Submitted: 1 year ago.
Category: Volvo
Expert:  camerontech replied 1 year ago.

Hi there,

My name is ***** ***** I am a licenced diagnostic technician with over 20 years experience.

I will do my best to help you with your automotive problem. Please remember, I cannot see, hear or feel your vehicle which can make diagnosing very complicated and some vehicle require extensive diagnotics that require certain diagnostics computers that can not be done over a computer or phone.Please be patient as I am not online 24 hours a day, as I do work, but I do check my page every day.A positive rating is always appreciated for my time and knowledge to help you with your problem.

I think you are on the right track, both with the trans and possibly the transmission codes as well.

I have seen a couple of these have bad connection on the TCM (transmission control module), It stores a few codes and than will lock the ecm for a no start.

HAve a look at the tcm connector for loose and poor connection, also please let me know the codes that were stored.

If the tcm connection is clean and ok, than please let me know if we have

1. spark

2. fuel pressure psi

3. injector pulse

4. 12v at pin 16 of dlc connector

Hopefully its just a simple connection

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Customer: replied 1 year ago.
Thanks Cam.. I've not forgotten you. It's just with the weather(rain) and work, I've not been able to find the answers to your questions.. I hope to get to it soon..
Expert:  camerontech replied 1 year ago.

no prob, ill keep the feed open

Customer: replied 1 year ago.
Cam, thank you for your patience. My time to work on my car has been limited, and a few new concerns have arisen.
Firstly, I removed both the ECU and the TCU from their box on the front left fender. When I opened the ECU, I found moisture droplets on the board. But no signs of any arcing or scorching. No smell of cooked electronics. The TCU was also damp when I gently opened it as well.
My research told me that "conditioned" air was circulated from the cabin via a fan and duct to keep these components dry. This led me to lift the carpet in the passenger foot well(as best I could). Though the carpets are dry, I found that water, that I believe has leaked from the possibly clogged sunroof drains. I removed the stereo amp from under the seat and also found clean clear water, but only 1/16" deep.. My plan is to remove the front seats, being carefully of static and the airbags, and then removing the molded carpet to dry it completely..
My first question. Is it possible that my ECU, and/or my TCU, was "cooked" due to this moisture issue?
Second, I've been charging the battery, out of the car, and have found the battery is toast. So a new battery is coming. I've read that if the battery isn't up to its peak that this could cause issues, like failure to start. Is this true?
Third, the vehicle did not come with any keyless fobs, but only one key; though it seems to be a chipped key(plastic head). If my key were not properly coded to my car, would it still turn over? Could THIS be my issue for the car not starting?
My plan, as of now, is to replace the battery, reinstall the ECU & TCU, and put all the engine pieces back in place. I have a friend sending me a laptop with VADIS and a cord to try and get a more accurate reading of the vehicles diagnostics. And then work through the tasks you sent me before..
Thank you for your patience and time. I bought this vehicle as a "project" and feel that I CAN solve its issues. Having your assistance makes this feel even more true..
Cordially,
Sean
Expert:  camerontech replied 1 year ago.

the moisture in the computers can reek havok. as fir will you see anything or smell anthing? probably not.

Ive probably replaced a 1000 computers i think i have only ever seen 1 burnt board.

i would take their covers off, spray with brake parts cleaner (as it evaporates water) and leave it inside the house fir a day or two.

Its the wet connections that can be it too.

dont worry about the airbags going off. It takes alot to ignite one.

as long as the battery is over 11. volts it should have no problems. but a new battery always helps.

theft systems are usually fir the starter system itself. if there is a theft problem, it will usually flash. id have to look a bit further into this.

dry everythinng out, dry the contacts and we will go from there!

cam