Electrics: 850: - oops i should stop fidiling!

s.hammond · Jan 23rd, 2009, 15:46

hi, again i was checking my oil and water after my shift but out curiousty i pulled the plug off my maf sensor to see if how my 850 would run....well it run s***t so i plugged it back in and it stalled.

my 850 restarted fine and if i'm honest seems to run better? but i now have the green triangle warning light obviously i triggered a fault but there isn't a fault it was me!

what i'm tring to say is how do i clear it, do i need to disconnect the battery for several hours?

cheers

simon.

DmcL · Jan 23rd, 2009, 15:59

disconnect 1 of the battery terminals for 5-10 mins then reconnect and viola.. lights out. car might run a little more rough than usual as the ECU will have been reset and need to learn for a few miles. also may use more fuel while its doing this but within a day or 2 it should be back to normal.

s.hammond · Jan 23rd, 2009, 16:06

thanks mate, might do it some good to relearn it's settings?

simon

John_C · Jan 23rd, 2009, 16:08

It'll do it more good than pulling the maf sensor connector out with the engine running anyway

s.hammond · Jan 23rd, 2009, 16:18

hi john, i know i know i was the same as kid 'wounder what this does oh s***t' lol.

DmcL · Jan 23rd, 2009, 16:30

never worry.. i was out pulling sensor connections the other day too lol

if u pull the connector off the ICV and put it back on u can hear it pop open or closed (whichever way it works) under the vacuum pressure in the inlet. my idle seems to be a smidge lower than before after doing that and resetting the ECU.. also revs seem to drop quicker between gears and when revving and lifting off. think my revs were hanging a little before as it feels better to drive now.

s.hammond · Jan 23rd, 2009, 17:00

i suppose the ecu being a computer benefits from having the power turned off from time to time like a reboot.

Simon.

s.hammond · Jan 24th, 2009, 09:49

Quote:

disconnect 1 of the battery terminals for 5-10 mins then reconnect and viola.. lights out. car might run a little more rough than usual as the ECU will have been reset and need to learn for a few miles. also may use more fuel while its doing this but within a day or 2 it should be back to normal.

dmcl, it didn't work i disconnected the earth for 10min shall go for longer and try diconnecting the positive as well?

mines pre obd it's the 3.2 system?

cheers

Juzzaman · Jan 24th, 2009, 09:56

Maybe d/c overnight and put back on when you need the car. Ive heard some people say few hours and some say 24.. Try for as long as you dont need the car. If your not going to use the car sunday, do sat night and put back on late as possible (upto 24 hours i suppose)

Justin

Chris_Rogers · Jan 24th, 2009, 09:59

If it's pre '96 use this method:

http://volvospeed.com/CheckEngine.php

If it later with the OBDII socket under the coin holder, look in artices and make the DIY LED code reader.

The method of use is the same as the link above.

For a '96 with the OBDII socket the fuel system is on pin 3 and the ignition on pin 1.

Jan 23rd, 2009, 15:46	#1
s.hammond VOC Member Last Online: Nov 23rd, 2016 06:28 Join Date: Dec 2008 Location: Whitehall, Bristol View Photos By: s.hammond	oops i should stop fidiling! hi, again i was checking my oil and water after my shift but out curiousty i pulled the plug off my maf sensor to see if how my 850 would run....well it run s*t so i plugged it back in and it stalled. my 850 restarted fine and if i'm honest seems to run better? but i now have the green triangle warning light obviously i triggered a fault but there isn't a fault it was me! what i'm tring to say is how do i clear it, do i need to disconnect the battery for several hours? cheers simon. __________________ VOC 22292 96 855 2.5 10v auto. 08 VW Golf 1.9 TDi DSG 00 Peugeot 306 1.4i LX**

Jan 23rd, 2009, 15:59	#2
DmcL WTF? Last Online: Apr 30th, 2009 18:22 Join Date: Sep 2008 Location: Derry, N.I.	disconnect 1 of the battery terminals for 5-10 mins then reconnect and viola.. lights out. car might run a little more rough than usual as the ECU will have been reset and need to learn for a few miles. also may use more fuel while its doing this but within a day or 2 it should be back to normal. __________________ 1989 325i SE, 1991 740GL

Jan 23rd, 2009, 16:06	#3
s.hammond VOC Member Last Online: Nov 23rd, 2016 06:28 Join Date: Dec 2008 Location: Whitehall, Bristol View Photos By: s.hammond	thanks mate, might do it some good to relearn it's settings? simon __________________ VOC 22292 96 855 2.5 10v auto. 08 VW Golf 1.9 TDi DSG 00 Peugeot 306 1.4i LX

Jan 23rd, 2009, 16:18	#5
s.hammond VOC Member Last Online: Nov 23rd, 2016 06:28 Join Date: Dec 2008 Location: Whitehall, Bristol View Photos By: s.hammond	hi john, i know i know i was the same as kid 'wounder what this does oh s*t' lol. __________________ VOC 22292 96 855 2.5 10v auto. 08 VW Golf 1.9 TDi DSG 00 Peugeot 306 1.4i LX**

Jan 23rd, 2009, 16:30	#6
DmcL WTF? Last Online: Apr 30th, 2009 18:22 Join Date: Sep 2008 Location: Derry, N.I.	never worry.. i was out pulling sensor connections the other day too lol if u pull the connector off the ICV and put it back on u can hear it pop open or closed (whichever way it works) under the vacuum pressure in the inlet. my idle seems to be a smidge lower than before after doing that and resetting the ECU.. also revs seem to drop quicker between gears and when revving and lifting off. think my revs were hanging a little before as it feels better to drive now. __________________ 1989 325i SE, 1991 740GL

Jan 23rd, 2009, 16:08	#4
John_C Allons-y! Last Online: Jun 8th, 2020 15:32 Join Date: Dec 2004 Location: Winchester	It'll do it more good than pulling the maf sensor connector out with the engine running anyway

Jan 23rd, 2009, 17:00	#7
s.hammond VOC Member Last Online: Nov 23rd, 2016 06:28 Join Date: Dec 2008 Location: Whitehall, Bristol View Photos By: s.hammond	i suppose the ecu being a computer benefits from having the power turned off from time to time like a reboot. Simon. __________________ VOC 22292 96 855 2.5 10v auto. 08 VW Golf 1.9 TDi DSG 00 Peugeot 306 1.4i LX

Jan 24th, 2009, 09:56	#9
Juzzaman Senior Member Last Online: Mar 30th, 2011 23:14 Join Date: Oct 2008 Location: Sudbury	Maybe d/c overnight and put back on when you need the car. Ive heard some people say few hours and some say 24.. Try for as long as you dont need the car. If your not going to use the car sunday, do sat night and put back on late as possible (upto 24 hours i suppose) Justin __________________ 1993 CBR600 FM 1996 850 T5 (Forge BOV Kit, Boost gauge @ 10psi) 2001 S60 2.0 TS

Jan 24th, 2009, 09:59	#10
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	If it's pre '96 use this method: http://volvospeed.com/CheckEngine.php If it later with the OBDII socket under the coin holder, look in artices and make the DIY LED code reader. The method of use is the same as the link above. For a '96 with the OBDII socket the fuel system is on pin 3 and the ignition on pin 1.

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