S40 (New) Engine 2.0D : Dodgy connections???

[glegalee]

Evening all,

I'm hoping to pick your collective minds please.

Last week my 2005 S40 weirded out on me 4 times in 2 days. I was driving along no problems then all of a sudden the dashboard shows me a message saying something like Brake System Failure stop safely. ABS light on, SRS light on and red (I think) exclamation light on. then a second or so later the dials all went to 0 even though I was traveling at 70mph, had a full tank of fuel, engine temp at mid range and engine was running at idle speed.

I always carry a basic code reader so i plugged it in and cleared the codes, turned off the car, waited about a minute then started the engine and drove to my destination 11 miles away.

Once there I turned off the car for about 10 mins then came to restart it. Upon starting the same error message was displayed and the dials were all at 0 even though the engine was idling, again deleted codes, restarted engine and drive home.

Next morning I went to the car and turned the key but was faced with a message saying immobiliser check manual, so I did, something about the chip in the key so I used the spare and all was fine.

Jumped on the motorway to travel to my destination, traveled about 20 miles and the same thing happened as the day before, this time though the codes could not clear and then the reader was unable to connect to the car so I called the tow truck.

I had the tow guy take me to a local diesel/electrical specialist as I just didn't have time to investigate myself.

They had the car for 2 days and could not get it to brake down at all. They scanned the codes and gave me a huge print out, they gave the car back without charge and told me they didn't have time to dedicate to looking into the fault.

I've since got a better diag computer and can accurately read Volvo codes rather than just generic ones so I plugged it in, deleted all codes except 3 and drove the car home absolutely fine, no issues.

Anyway many of the codes given are about failure to communicate with modules around the car, however I would put this down to maybe a connector on the ECM and/or CEM or even both. I removed them last year during a different brake down situation and cleaned all connections as I know they are poor quality on this age S40.


The 3 remaining codes are as follows:

ECM-0380 Glow Plug Relay. Faulty Signal - I've read about this fault on this forum in a different thread and apparently it's not really a problem. The car starts perfectly in all weathers and temperatures.

CEM-4F33 Battery Temperature Faulty Signal - Linked to the following code.

CEM-4C01 Outside Temperature Sensor. Signal Too High - This sensor is disconnected and therefore the ECM can not determine the battery temperature as the reference signal from the outside temp sensor is not available.

There are currently no other codes on the car which is why I'm thinking bad connection somewhere. It's obviously an intermittent fault, the worst kind of fault. Does anyone have any further ideas or things that I should be looking at please? Also I can not afford to buy VIDA DICE and whilst that is that is recommended, it's unfortunately not an option for me

Thanks for your time and knowledge.

Greg.