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Mystery secondary ECU in Volvo V70 T5 2000

Posted By Volvoboing Wednesday, August 26, 2015 11:34:46 PM
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Volvoboing
 Posted Wednesday, August 26, 2015 11:34:46 PM
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Can anyone shed any light on the apparent existence of a secondary ECU (ie not the one next to the Auto Transmission CU t front RHS of engine compartment) which was found to be sending bad data to the CAN Bus after BBAReman found the main ECU units arriving for testing had no faults some years ago?

Have found the notes on my phone conversation with BBAReman a few weeks ago.


Was told their notes on the part number of the V70 ECU say the following:

"Main ECU units sent in had no faults, but it was discovered there was a second(ary) ECU on the cars sending bad data to the CAN BUS.....see thread on forum for details"

If we cannot access the thread referred to there, has anyone any idea what (and where) this other ECU might be?

Here is the fault description for anyone who thinks they might remember, or have any ideas (originally posted in error under 'General Chat - appols to those who have already noticed this there...Many Thanks


"This is a Year: 2000 , 2.3L , Volvo V70 T5

Part No: 0261206828

Apparently (per phone call) your system has a note saying a number of these units came in with this fault description or similar, and no fault found - however there was a secondary ECU (or something) somewhere on the car that was to blame. Would someone mind looking for the old thread (suggested may have been archived as I cannot finf using the search facility) or just recalling the details? We don't particularly want to scrap this car...

Fault as follows:

STC (anti-skid) dash warning light flashed a few times intermittently while driving at steady speed on straight road for a couple of days. Car then parked overnight. On attempting to start there was 'NO CRANK' and 'NO START' accompanied by message "BRAKE FAILURE, STOP SAFELY" and message "SRS-AIRBAG SERVICE REQUIRED URGENT" in dash display. A message "ALARM SERVICE REQUIRED" also appeared once or twice. Car battery boosted via jump leads (just in case was battery) and many attempted starts made. On one occasion started did crank but engine did not fire at all - while cranking the 'engine emissions' light was illuminated. All other attempts to start were: 'no crank, no start' and the "SRS-AIRBAG SERVICE REQUIRED URGENT" message remaining as only message displayed. Two mechanics checked car out & there seems to be no instruction going to starter motor from ECU, starter will crank if ECU bypassed, relays work, different ignition key tried etc. FAULT CODE: "720a - Communications fault with immobilizer control" unit recorded.

Fault Codes: 720A-Communications fault with immobilizer control unit

K And R
 Posted Thursday, August 27, 2015 5:08:39 AM
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" 720A-Communications fault with immobilizer control unit"


720a has four different discription,s all are immo codes but none with the exact wording as above, so post FULL info i asked for in your other thread or we are going nowhere.


Kev.

"If you dont KNOW how it works, don,t try to test or fix it"
columbo
 Posted Thursday, August 27, 2015 8:35:03 AM
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The volvo dash cluster is a known problem causing all your faults, my friends old car had to have the dash wacked with a fist and then it would boot into action.

if you look into volvo dash repair there is lots of info.

your immo might be built into the dash or if its slightly older its in behind the fusebox, check the plug and also the pick up on the key barrel.

good luck




oh and one more thing.............give it a wash.
Volvoboing
 Posted Thursday, August 27, 2015 9:03:07 AM
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Thanks for the help Kev, unfortunately the car was towed back to the owner from the garage that did the work and that description of the fault code was all that could be extracted from the mechanic's notes. The owner is not in a position to get more details.
Timbo
 Posted Monday, August 31, 2015 4:17:22 AM
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Firstly which flavour of 2000 V70 are we talking since both could be bought new in that year? P1 or P2 ?

Vastly different wiring systems,


On a knife edge !
Volvoboing
 Posted Monday, August 31, 2015 8:02:31 AM
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Timbo its a P2.

Any help regarding what and where there might be something that might have been described as:


....."2nd ECU sending bad data on to CAN bus".....(per BBAReman note)


...would be much appreciated, as would any other helpful info.



K And R
 Posted Monday, August 31, 2015 9:20:09 AM
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Timbo

No T5 on P1.

Volvoboing.

Untill you get the results of a global scan with a good scanner (and there are not many that can do a good job ! on volvo's ) you are pi**ing in the wind.

Then you will need some-one with a "scope" to check the CAN-BUS (if that's what the global scan points too).

Swapping a mystery ECU will be playing "PARTS DARTS" with-out proving it,s faulty.

Kev.


"If you dont KNOW how it works, don,t try to test or fix it"
Timbo
 Posted Wednesday, September 02, 2015 12:29:42 PM
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K&R - no T5 P1 ? wtf are you on?!

1992 850 series, 93 was the first T5 in the estate. The saloon t5 followed 6 months later. and T5-R, R, etc....

1997 through to 2000 x70's are all P1's. (no can bus)

2000 - 2004 V70, S60, XC90 are all P2 cars. ( all can bus)

After that they tend to split into P2.5 and P3 cars depending on model and year. (dual can bus )

The New XC90 and others to soon follow are the SPA platform.


Read up on your Volvo's!


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Wednesday, September 02, 2015 12:39:44 PM by Timbo
K And R
 Posted Thursday, September 03, 2015 6:49:54 AM
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Timbo

"Read up on your Volvo's!"


I did, i checked on vadis.


Kev.

"If you dont KNOW how it works, don,t try to test or fix it"

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