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2004 Volvo XC70; Crank, no start

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AntiqueTurbo
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2004 Volvo XC70; Crank, no start

Post by AntiqueTurbo » Sat Feb 01, 2020 11:09 pm

Greetings people of MVS!

Long time listener, first time caller. I have an issue that I've been chasing and researching for about two months now. I read as much as I could to avoid posting, but I wanted to get your take on my situation.
A little background on me: I've worked on cars in an amateur setting for about 15 years, and I've worked on computers professionally (software development, hardware assembly, networking etc) for about the same amount of time. I've done everything on vehicles from brake pad changes to engine builds. Worth note, this is my first rodeo with Volvo.

TL;DR: My friend's son is driving his trusty 2004 Volvo XC70 AWD, when out of nowhere, in traffic, the vehicle shuts off and stops moving. He tries to get his XC70 to start, but alas, all it does is turn over. My friend has it towed to a mechanics shop (a self-professed Import Specialist) and the mechanic says that the ECM is kaput. I don't know what he used to diagnose this, but all I got out of him was "The scanner isn't able to read the ECU." I don't know if that means generic OBDII scanner or Vida DiCE, but that's what he said. I immediate fall in love with the car when I lay eyes on it and buy it from my friend for a reasonable price.

I get the vehicle home, and I immediate start researching all of the possibilities. Everyone says that these ECMs are near-bulletproof, and I'm prone to believe that. So, what have I tested?

+ Fuel Pressure is good
+ Fuel pump appears to prime appropriately
+ Made sure the ECM was seated properly (the mechanics left it in the front seat)
+ Used a jump pack to get the battery within an operating voltage
+ Checked the ECM fuses and relays (Mechanics left wiring diagrams indicating power to the ECM was good, but always worth double checking)

What have I done?
+ Ordered a Vida DiCE, slow shipping, but it's coming.
+ Read about many similar issues, although none matching my problem exactly from what I could find.
+ Attempted to hard reset the ECM, although I'm not sure it was effective.
+ Used the dash to check DTCs (There were many, TCM comes to mind; it said the ECM wasn't checked, but I assumed that was because the car wasn't started.)

If anyone has any other troubleshooting methods I could try before my DiCE gets here in some weeks, I would love to hear them; I want to see this Volvo on the road so badly.

In the event that the ECM is bad, what should my next action be? I've heard some kind of contradicting things regarding ECM cloning (IE that the ECM has to be able to communicate with the vehicle).

Thank you all for your time,

- AT

EDIT: Wanted to add some additional info here. SRS Warning is on. I'm not sure if that's recent or if it had been that way, but the vehicle wasn't in an accident. There is a symbol illuminated in the center of the dash; red exclamation point in a triangle.

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RickHaleParker
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Re: 2004 Volvo XC70; Crank, no start

Post by RickHaleParker » Sun Feb 02, 2020 2:33 am

Voltage alone is not enough. It need to be able to deliver enough power also. Make sure you have a battery in good condition. A poor condition battery could be the source of the many DTCs. Like any processor controlled hardware, voltage and signal quality is critical.

Inability to communicate with the ECM maybe a problem on the Controller Area Network Bus (CAN bus), shorts, opens power and ground to the control modules.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

AntiqueTurbo
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Re: 2004 Volvo XC70; Crank, no start

Post by AntiqueTurbo » Sun Feb 02, 2020 4:30 pm

Thank you for the reply! The battery is from November 2018. The terminals are clean, and appears in good shape. I’ll take it to get tested, just in case!

AntiqueTurbo
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Re: 2004 Volvo XC70; Crank, no start

Post by AntiqueTurbo » Mon Feb 03, 2020 11:51 pm

Update: Scanner is here, confirms there is no communication with the ECM. I’ve checked all the grounds that I know to check. Fuses are good.

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RickHaleParker
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Re: 2004 Volvo XC70; Crank, no start

Post by RickHaleParker » Tue Feb 04, 2020 3:33 am

AntiqueTurbo wrote:
Mon Feb 03, 2020 11:51 pm
Update: Scanner is here, confirms there is no communication with the ECM. I’ve checked all the grounds that I know to check. Fuses are good.
ECM only?
How about the CEM and TCM? With a automatic transmission,communication with the ECM is from the CEM via the TCM. A screen shot of Diagnostics \ Fault Trace \ Initial State would be helpful.
2020-02-04.png

X70 High Speed Can Bus.png
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Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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