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1995 850 Electronic CLimate control , control unit fault codesECC Topic is solved

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
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maxi948
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1995 850 Electronic CLimate control , control unit fault codesECC

Post by maxi948 » Mon Dec 25, 2017 7:20 am

hello, i have a 95’ 850, and the ecc doesnt work properly, sometimes it comes back on and everything is normal, but thats like 1 out of 20 times..

I have read out these codes, from the B1 terminal: 135-143-417-418

Anyone with the same problem, how to solve it etc.

Thanks!

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Re: ECC

Post by abscate » Mon Dec 25, 2017 11:02 am

You used to be able to get the 135 code fixed at Sears.
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Re: ECC

Post by rspi » Mon Dec 25, 2017 2:04 pm

Is the ignition switch bad?
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Re: ECC

Post by maxi948 » Tue Dec 26, 2017 2:51 am

the ignition switch is not bad, its working like it should.

Tha main problem for me now is that the fan is running only at slow speed, and it only blows a little heat.

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Re: ECC

Post by jreed » Tue Dec 26, 2017 6:37 am

Some of the codes you listed may no longer be active, so I would start by resetting all the codes, operating the system for a day or so and observe which codes return.

The first code (135) is for No signal from engine coolant temperature sensor. If still active, this issue may cause a rough running engine and no reading on the dash for engine temperature.

The second (143) is for Faulty signal from passenger’s side temperature selector switch. For this you may need to clean the switch mechanism inside the ECC. If you open up the ECC, be sure also to check for burned capacitors or other components inside since you have a code 418 (see below).

The third (417) is for Passenger’s side interior temperature inlet fan seized. This is a common problem. You can remove the temperature sensor and gently clean out the dust to free up the fan motor.

The fourth (418) is for No control signal to blower fan power stage. This could indicate a broken wire, open or damaged connector, a failed ECC or a failed power transistor. Some signal tracing may be needed. This problem may be associated with the symptom you describe that the fan is only running at slow speed.
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Re: ECC

Post by maxi948 » Tue Dec 26, 2017 7:06 am

Thanks for the answer, i will do as you describe here. It can also be as you say, that not all the codes are active.
Thank you for the guidance!

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Re: 1995 850 Electronic CLimate control , control unit fault codesECC

Post by abscate » Tue Dec 26, 2017 9:56 am

Edited to reflect usage of ECC for climate system as opposed to control unit.
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Re: 1995 850 Electronic CLimate control , control unit fault codesECC

Post by jreed » Wed Dec 27, 2017 6:49 am

Good luck.
The threads below have helpful advice on diagnosing the 418 code. In the situations described below, the power transistor was determined to have failed and replacing it restored some or all of the system's functionality.
viewtopic.php?t=40168
viewtopic.php?t=8819
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: 1995 850 Electronic CLimate control , control unit fault codesECC

Post by maxi948 » Sat Jan 13, 2018 5:48 am

So, i forgot to update u guys.
I went to the scrapyard and was going to see if i could find a power stage, but with no luck. then i took the fan out of the car and saw that the fan and motor was full of dust and dirt. I cleaned the elmotor with electroclean a couple times, and i took some sandig paper and went over the contact, just to be sure that there where good contact.

i used lithium-grease to lube the rod that goes through the elmotor and on tho the fan. now it moved freely and i put it in the car again. Voila, it was the fan that caused the problem, and now i have heat again. thats awesome, because its winter, and the temperature is always below 0 degrees celsius

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Re: 1995 850 Electronic CLimate control , control unit fault codesECC

Post by abscate » Sat Jan 13, 2018 5:57 am

We have a program to vacation people from Norway in Haiti. We try to get them to stop here in the US but they always leave when they see our health care system, our roads, and AM radio
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