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ECM-6300 and ECM-6B00 2000 V70R [BAD Battery to fusebox supply cable!] EPIC Troubleshooting Topic is solved

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1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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abscate
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Re: ECM-6300 and ECM-6B00 2000 V70R

Post by abscate »

I've never been totally stumped by a car before, this is a first.
Fixed that quote for you. Congratulations.

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Please do the honor of either checking the green box
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Re: ECM-6300 and ECM-6B00 2000 V70R

Post by abscate »

scot850 wrote: Mon Jul 22, 2019 7:44 am I'm sure you have already checked or swapped the B+ cable in the main fusebox and the electrical portion of the ignition switch?

The B+ cable can look ok, but undo the nut in the fusebox and look at the cable under it. Mine looked ok, but found it had almost totally melted and had bare areas that could potentially short out.

Not sure if it would help, but I have a spare ECU from a 2000 V70R, and also a ETM from a 2000 V70XC that I had connected to my 2000 V70R as suggested by precopster to see if it worked. It whined like a good un so should be good. Also think I may have a good electrical portion of an ignition switch. If you fail to get any further I can send the parts for you to swap out on a trial basis. I would like them back as they are my back up stash.

Neil.
Awarded this year of our Swede 2019 for nailing it..
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Empty Nester
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Re: ECM-6300 and ECM-6B00 2000 V70R [BAD Battery to fusebox supply cable!] EPIC Troubleshooting

Post by bmdubya1198 »

I knew I'd figure it out eventually, it was just really getting on my nerves... I'm a little annoyed that it took me so long, but I'm happy to have this behind me! I wish it also fixed the whiny ETM, but I'm fairly confident I can have that fixed today.

Neil gets the honorary "topic solved" for his post! Shame on me for not checking that terminal more closely earlier!
'00 V70R Venetian Red/Charcoal M56 Swapped 199k
'03 S60 2.4T Silver/Black 117k
'07 XC90 V8 AWD Sport Titanium Grey/Black 174k
'91 944 Turbo Dark Green/Beige 175k
'92 245 Base White/Beige 249k
'99 BMW 528i
'01 Mountaineer 5.0
Sold-
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k
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Re: ECM-6300 and ECM-6B00 2000 V70R [BAD Battery to fusebox supply cable!] EPIC Troubleshooting

Post by scot850 »

Thanks for the thanks, but glad you got to the bottom of the issue eventually. It is a strange issue with the B+ cables. Seems to affect the 99/00 'bastards' more than earlier ones for some reason, although earlier cars are not strangers to the issue as well. I have read of cars going on fire and underhood fires caused by this issue, so all take heed and been warned! Check carefully!!

As to the whining ETM, maybe it is just like that? These 'R's are needy cars so how better to keep your attention than whine all the time!!

My ETM also whines but only for a short period after turning the ignition key. Did you try another ETM to see if it does the same?

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold
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Re: ECM-6300 and ECM-6B00 2000 V70R [BAD Battery to fusebox supply cable!] EPIC Troubleshooting

Post by abscate »

I think there is a whiny ETM thread going on this one.

I’ve noticed on my 99 I had to remove all the relays and clean heavy oxidation off the spade terminals twice over 20 years. Maybe humid air is reaching the box on these, redesigned from -1998?
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Re: ECM-6300 and ECM-6B00 2000 V70R [BAD Battery to fusebox supply cable!] EPIC Troubleshooting

Post by bmdubya1198 »

I'm not sure, I almost feel like the noise is between the firewall and engine now. But sound travels, so I can't confirm. Weird...
'00 V70R Venetian Red/Charcoal M56 Swapped 199k
'03 S60 2.4T Silver/Black 117k
'07 XC90 V8 AWD Sport Titanium Grey/Black 174k
'91 944 Turbo Dark Green/Beige 175k
'92 245 Base White/Beige 249k
'99 BMW 528i
'01 Mountaineer 5.0
Sold-
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k
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Re: ECM-6300 and ECM-6B00 2000 V70R [BAD Battery to fusebox supply cable!] EPIC Troubleshooting

Post by bmdubya1198 »

Aaaaaand just what I wanted to say a year later... IT'S BACK!

Thread over on Swedespeed, but just to update this one, it's the same situation as before. CEL is on now for P0455, and it's flickering just as it was. No ETS light this time around, although while cranking, it does flicker since it's on during the warning light test.
While testing things though, I noticed if I applied a test light to the signal wire for the CEL, it stopped flickering. How does it show signal too low/short to ground, yet pulling more current on that circuit eliminated the problem? Hmm...
'00 V70R Venetian Red/Charcoal M56 Swapped 199k
'03 S60 2.4T Silver/Black 117k
'07 XC90 V8 AWD Sport Titanium Grey/Black 174k
'91 944 Turbo Dark Green/Beige 175k
'92 245 Base White/Beige 249k
'99 BMW 528i
'01 Mountaineer 5.0
Sold-
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k
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abscate
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Re: ECM-6300 and ECM-6B00 2000 V70R [BAD Battery to fusebox supply cable!] EPIC Troubleshooting

Post by abscate »

Because you are loading a potentially complex transistor circuit , not a simple DC one. The CEL is triggered by being grounded through the Q on the ECM board somewhere, in all likelihood

Clean all those grounds, clean those B+ terminals

How is battery age and HISTORY?
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Re: ECM-6300 and ECM-6B00 2000 V70R [BAD Battery to fusebox supply cable!] EPIC Troubleshooting

Post by bmdubya1198 »

Battery is maybe 6 months old, never any issues with it. I'm thinking about making a new ground cable for the battery too, it's looking old.
'00 V70R Venetian Red/Charcoal M56 Swapped 199k
'03 S60 2.4T Silver/Black 117k
'07 XC90 V8 AWD Sport Titanium Grey/Black 174k
'91 944 Turbo Dark Green/Beige 175k
'92 245 Base White/Beige 249k
'99 BMW 528i
'01 Mountaineer 5.0
Sold-
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k
User avatar
bmdubya1198
Posts: 4320
Joined: Tue Dec 30, 2014 10:45 am
Year and Model: 2K V70R M56
Location: Charlotte, NC
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Re: ECM-6300 and ECM-6B00 2000 V70R [BAD Battery to fusebox supply cable!] EPIC Troubleshooting

Post by bmdubya1198 »

Does anybody know if the signal from the ECU for the CEL is supposed to be power or ground? The diagrams aren't very clear. It almost looks like the alternator D+ wire should be the supply and the ECU will ground the CEL circuit to illuminate the bulb. I have perfect voltage from the alternator (14v at idle) so that's not an issue. When I checked continuity to ground on the CEL wire, it was flickering from open circuit to 0 ohms consistently with the flickering. Voltage is very low, less than 1v.

I have voltage on the ETS wire, and that isn't illuminated. It seems that it has battery voltage when the light is off, then grounded when it's on. What I don't understand though is how VIDA tells me there's a short to ground, yet it's SUPPOSED to be grounded? I really have no idea what's going on here. All I can think is that the driver for the CEL and ETS light in the ECU are dead. I really don't want to drop the money on testing that theory unless I'm absolutely certain, though.

There doesn't seem to be a problem with any grounds. I'll do another voltage drop test on the battery grounds today with the engine idling. Last time I tested it, there was VERY little drop, only maybe 2-3 mV.
'00 V70R Venetian Red/Charcoal M56 Swapped 199k
'03 S60 2.4T Silver/Black 117k
'07 XC90 V8 AWD Sport Titanium Grey/Black 174k
'91 944 Turbo Dark Green/Beige 175k
'92 245 Base White/Beige 249k
'99 BMW 528i
'01 Mountaineer 5.0
Sold-
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k
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