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Volvo 850 ECC Testing/faulty?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Navy
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Navy

Re: Volvo 850 ECC Testing/faulty?

Post by Navy » Tue Mar 10, 2020 12:27 pm

Hello and many thanks to everyone for replying.
jreed. I tried several times to do a diode test but I get no reading either way. I tried to clean the diode and the left side just lifted away from the metal tang without any pressure infact It probably burnt through and separated before I started testing/cleaning, I suspect this may be my issue.
The quality of my photos are not the greatest as the pcb is still in perfect condition around the diode (the first pic is probably the best) also I am 100% sure the capacitors have no leaks even though the pics show some sort of residue. The two forward resistors (4701 - 1501) measure within range on my dmm.
The burnt diode has the very slightest impression of the letter and number A2 on the right side which matches diode D5 perfectly.
I have no idea where to source one of these A2 diodes. Do they vary in voltages/current switching speeds? I have no idea.

Abscate, that is such a generous offer!!! I am almost certain my ECC is working as the voltages at the pins all match the service manual.
However I may still be in the market for a power stage if this diode issue doesn't bear fruit.
BTW there isn't a beach anywhere like Maracas. ;-)

Scot850, sadly my phone camera is not really up to the job.....I am sure the capacitors are not leaking but I will most certainly change them if I can get the power stage to work as I understand 26 years for a capacitor is borrowed time and then some.

Thank you so much for taking the time to help me
André

Navy
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Re: Volvo 850 ECC Testing/faulty?

Post by Navy » Tue Mar 10, 2020 12:37 pm

IMG_2020-03-10_18-37-29.jpg
IMG_2020-03-10_18-37-29.jpg (286.17 KiB) Viewed 66 times

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Re: Volvo 850 ECC Testing/faulty?

Post by jreed » Thu Mar 12, 2020 6:13 pm

It looks like D4 overheated and failed. I wonder if there is a schematic diagram available for this unit? That would be a great help in troubleshooting. Until you figure out what caused the failure and fix it, it's risky to put in a known good ECC unit because it might fail too.
1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94

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Re: Volvo 850 ECC Testing/faulty?

Post by RickHaleParker » Thu Mar 12, 2020 6:43 pm

Heads up: There are 10 versions of the 850 ECC and they are not all interchangeable.
These users thanked the author RickHaleParker for the post:
jreed
--------
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.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

Navy
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Re: Volvo 850 ECC Testing/faulty?

Post by Navy » Fri Mar 13, 2020 5:19 am

Thanks for replying.
So far 3 electronic component manufacturers require more information regarding the specifications of the diode. I have e mailed ALPS requesting such information and the wiring diagram too but I am not too hopeful.

I have seen condensation damage on pcb's before and I recall a faint white haze around the two resistors and diode. I am convinced the diode pin's were covered in corrosion which accounted for the failure. You may also notice some of the tell tale blue/green corrosion on the side of resistor 28 and 29.

I don't want to guess the diode's specifications but I see no other easy option. Hopefully, Alps will have the info for me.

Thanks again
André

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Re: Volvo 850 ECC Testing/faulty?

Post by RickHaleParker » Fri Mar 13, 2020 1:20 pm

Navy wrote:
Fri Mar 13, 2020 5:19 am
I don't want to guess the diode's specifications but I see no other easy option. Hopefully, Alps will have the info for me.
Any clue who the vendor is? SMD markings.
--------
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.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

Navy
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Re: Volvo 850 ECC Testing/faulty?

Post by Navy » Fri Mar 13, 2020 2:10 pm

Thanks for replying.
The only markings on the pcb are ALPS Issue M03 ANJ970IIE.
The diode has A2 printed on the surface.
I understand from component manufactures that this is not enough info. I need specs for the original diode Volts/current in and out.
Many thanks
André

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Re: Volvo 850 ECC Testing/faulty?

Post by RickHaleParker » Fri Mar 13, 2020 2:29 pm

Navy wrote:
Fri Mar 13, 2020 2:10 pm
The diode has A2 printed on the surface.
There are only two diodes on the A2 list in the link, in a Small Outline Diode (SOD ( Two leads )) package .
Vishay Diode 1N4148WS and ROHM Zener diode UDZS5.1B.

If where to bet, I would bet on the 1N4148 because you have more then one on the board and Zener diodes are not so common.
--------
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.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

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jreed
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Re: Volvo 850 ECC Testing/faulty?

Post by jreed » Fri Mar 13, 2020 5:59 pm

If it's of use, I could open up my spare ECC unit and inspect/measure the diode in it. It might not be the same version of the ECC unit that you have in your car, though.
1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94

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jreed
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Re: Volvo 850 ECC Testing/faulty?

Post by jreed » Sat Mar 14, 2020 10:14 am

I took apart the ECC unit I got out of a 1996. It doesn't look like the pictures of yours. I did notice that the silkscreen labels show "ZD" for zener diode and "D" for diode. That may mean that your failed component is more likely to be a diode instead of a zener diode. You could check your board to see if there are any components labeled with the "ZD" prefix.
This ECC is labeled 9166550 W605K on the outside sticker.
The circuit boards are labeled ALPS ANJ 97813F (small upper board) and ALPS ANJ97812J ISSUE M11 (larger lower board)
IMG_9420.JPG
IMG_9421.JPG
IMG_9422.JPG
IMG_9423.JPG
IMG_9424.JPG
1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94

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