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  #1  
Old 04-04-2005, 07:41 PM
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Default reseting the entire computer/module

Hello there everyone. First of all, I hope that things are going well for you all, and second, I was wondering; I read a message somewhere on the group website that talked about completely reseting the computer/module. This entailed something like; turining the ignition on, then pressing the button on the module 5x, then waiting for the light to turn on, then pressing the button again 5x, and waiting for the light to blink. I have been looking hard to find this message, but I can't. Can anyone give me the proper way to reset the module, once all of the problems are fixed, or did I not read something correctly, and I'm blowin' smoke up everyones a#$. :-) If I am, than I'm sorry. You'll have to excuse me, I'm a new Volvo owner, and I don't know any better.
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Old 04-04-2005, 11:05 PM
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Default RE: reseting the entire computer/module

You can reset the computer by pulling the fuse for the ECM or disconnecting the battery for 15 minutes.Leave the fuse out for 15 minutes.Which ever way you decide to go.If you disconnect the battery make sure you get the radio code first
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Old 04-05-2005, 09:44 PM
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Default RE: reseting the entire computer/module

Mr. Tech, your the BEST!!! Thanks for the info!
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Old 04-06-2005, 04:04 AM
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Default RE: reseting the entire computer/module

Your welcome.
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Old 01-04-2007, 08:57 PM
 
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Default RE: reseting the entire computer/module

Where is the fuse for the ECM? I have looked and high low but unsuccessful so far.

Just put new ignition leads and O2 Sensor on, so thought it might like a reset, might fix the idle speed too (idles at about 1000-1100 when warm)
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Old 01-04-2007, 09:57 PM
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Default RE: reseting the entire computer/module

It is in the fuse box under the hood.
It should say something like engine computer or ignition or fuel system.
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Old 01-05-2007, 01:32 AM
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Default RE: reseting the entire computer/module

Good evening,

In case if removing the fuse or disconnecting the battery for 15 minutes didn't clear the codes (which happened to me a few times, certain codes seem really stubborn), you'd have to clear the codes manually, either via OBD-I terminal or with OBD-II scanner connected at the DLC receptacle in front of the shifter, under the coin holder.

In addition to keeping the codes for radio, make sure that the ECU re-learns idle. When you do this, all electrical loads must be turned off. I usually let the engine idle for 5-10 minutes, but the specified re-learning periodis probably Mr. Tech's jurisdiction (Haynes does not specify).

Best wishes,


JPN
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  #8  
Old 01-06-2007, 07:15 AM
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Default RE: reseting the entire computer/module

I might have missed something but I can't findwhich modelVolvo you are referring too.

Assuming you vehicleis manufactured prior to 2000,then I understand the procedure for resettingfault codes on theearly 850's to that of thelater 850/70's is completely different.
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  #9  
Old 02-19-2008, 01:16 PM
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Default RE: reseting the entire computer/module

Hi, what do you mean by "turning off all electrical loads?" I think I may be having a similar problem with my 850. After replacing O2 sensors, idling is intermittently rough, then the check engine light came on. Replaced the thermostat and coolant temperature sensor (OBD scan said these were faulty), disconnected the battery for 30 min to clear codes, then drove off (I didn't let it idle for a while first). Idling is still rough, and my mechanic is completely stumped!

I will try taking out the fuses for 15 min, then letting it sit and idle for a while. This problem is driving me nuts!
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Old 02-19-2008, 09:59 PM
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Default RE: reseting the entire computer/module

Meaning that anything that uses electrical power has to be in "off" position, except the ECUs whose power cannot be cut, or the engine wouldn't run. While you make the ECU re-learn idle, chock the wheels if possible and start the engine with your foot OFF the brake pedal because this causes the rear brake lights to turn on (do not start the engine with the transmission in "N"; must be in "P", for manual gearbox you must chock the wheels). I even disengage the parking brake to turn off the indicator on the instrument cluster. I then let the engine idle for 10 minutes. I am not sure if this is the official procedure, as some seem to note that the car has to be driven for 500 miles, etc...

Some codes cannot be deleted by disconnecting the battery; it would have to be done via OBD-I for '93-'95 models or via OBD-II for some '94 (some '94s did not come with OBD-II)-'97 models.

Let us know if you need additional guidance.


JPN
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Old 02-19-2008, 09:59 PM
 
 
 
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1987, 50, 850, computer, engine, ford, idle, make, message, module, modules, relearn, reprogram, turn, volvo


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