Electrics: 850: - How to make a Flash Code Reader, for Dummies - Page 2

Yamdy68 · Dec 28th, 2009, 17:36

Thanks Chris
It has a full set of 3 ECU's so it sounds like it's a Jetronic. That means the flash code reader should work?
I'm trying to get some clue as to why the thing won't start.
It's a non-runner since overheating on the motorway with a suspect head gasket (AA man)
There is no sign of any cross contamination of oil and water but theres a big rusty hole in the rad. I'm therefore assuming this to be the cause of the water loss and I might get away with just a new rad, but before buying one I want to get it running again. It turns over and I have fuel and spark but it will not fire. Sorry to go off topic but I'm at my wits end and need a clue to point me in the right direction.

Chris_Rogers · Dec 28th, 2009, 20:41

I'd suggest you do a compression check.

And yes the flash code reader will work, pin 3 for the fuel ECU and pin 1 for the ignition.

Yamdy68 · Dec 29th, 2009, 11:06

Compression was my next move but I haven't got a gauge so I'll try to get one later.
I'll have another go with the flash reader and try pin 1 as well but it won't be until tomorrow now - I've got to take the Wife to Ikea today!! (if my old 940 makes it up to Nottingham)
Cheers

Yamdy68 · Dec 30th, 2009, 11:24

Ok, compression test done and readings extremely low, between 70 & 95 !
They increase up to 130 to 145 with oil in bores. I'm going to give up on this and get rid as a non runner. I've not had the car long and a few things I've found (missing bolts, iffy electrics and a thermostat butchered to fit cos' it's the wrong one!) suggest it has been bodged in the past so it's not worth spending any more time and effort on.

I tried the flash reader in port 1 and it worked great 1-1-1 no fault, but still couldn't get it to work in 3.
Thanks for all assistance, I'm now on the lookout for a replacement !

charlotte001 · Mar 25th, 2010, 21:12

I've borrowed a flash code reader read the instructions it says I can check EFi,AC, Cruise control can I check ABS too if so what port do I put the pins into ? Will build one over the weekend so I can read the codes off whenever anything is done to the engine.

Charlotte

Jod T5 · Mar 29th, 2010, 13:33

Quote:

Originally Posted by charlotte001

I've borrowed a flash code reader read the instructions it says I can check EFi,AC, Cruise control can I check ABS too if so what port do I put the pins into ? Will build one over the weekend so I can read the codes off whenever anything is done to the engine.

Charlotte

No it will not read the ABS...
You will need Vol-FCR....

Jod

whoa · Apr 4th, 2010, 01:23

Put it in a box with a button and a connector, and life is easy:

The car rewarded me for my effort with a 1-1-1.

Paul240480 · Apr 4th, 2010, 11:06

Quote:

Originally Posted by Chris_Rogers

I expect your 20 valve car has Motronic 4.4, which will need a scan tool, good news is that it's OBDII compliant so you can buy one quite cheaply.

Too make sure open the ECU box behind the RH headlamp and count the ECU's

For a manual car, if there is one ECU then it will be Motronic 4.4
If there are two then it will have Jetronic.

For an auto car add one ECU (for the transmission) to each of the above.

Thanks Chris! I've just had a look at mine ( 1996 2.5GLT 20v) & it has two ecu's in the box, so = Jetronic & so a flash code reader should work for mine

too.

Paul240480 · Apr 5th, 2010, 12:21

...............................and Dad-in-Law has been detailed off to pop off to Maplins to get the bits & send them out me

Maplins won't deliver outside of UK.

jackjon13 · Apr 24th, 2010, 00:08

I also have a '96 850 with the B2524S coupled to the 4 speed auto, is the ECU for the engine clearly labelled as to whether it is a motronic 4.3/4.4 or jetronic? Also does anyone know if these ECUs are flash ECUs or not?

Cheers, John.

Mar 25th, 2010, 21:12	#15
charlotte001 Premier Member Last Online: Jul 26th, 2012 11:13 Join Date: Jul 2009 Location: norwich	Flash Code reader I've borrowed a flash code reader read the instructions it says I can check EFi,AC, Cruise control can I check ABS too if so what port do I put the pins into ? Will build one over the weekend so I can read the codes off whenever anything is done to the engine. Charlotte __________________ Previous Volvos:850 GLT 2.5 20V Auto Saloon Silver. 1997 850 T-5 Auto Estate Nautic Blue Chipped ECU, V70 TCV, Carbon Cased Filter, 17inch alloys, Rattling Engine masking the suspension rattles. Engine doesn't rattle anymore

Apr 5th, 2010, 12:21	#19
Paul240480 Ovlovnut Last Online: Feb 25th, 2024 08:58 Join Date: May 2006 Location: Nivillac View Photos By: Paul240480	...............................and Dad-in-Law has been detailed off to pop off to Maplins to get the bits & send them out me Maplins won't deliver outside of UK. __________________ 2004 V70 2.4SE Auto 'The Welshmobile’ 2002 Laika Ecovip 400i ( Motorhome on an Iveco 2.8TD) http://www.gitessouthbrittany.com/ http://moncopainmonchien.jimdo.com/

Dec 28th, 2009, 17:36	#11
Yamdy68 New Member Last Online: Dec 31st, 2009 08:17 Join Date: Dec 2009 Location: Leicester	Thanks Chris It has a full set of 3 ECU's so it sounds like it's a Jetronic. That means the flash code reader should work? I'm trying to get some clue as to why the thing won't start. It's a non-runner since overheating on the motorway with a suspect head gasket (AA man) There is no sign of any cross contamination of oil and water but theres a big rusty hole in the rad. I'm therefore assuming this to be the cause of the water loss and I might get away with just a new rad, but before buying one I want to get it running again. It turns over and I have fuel and spark but it will not fire. Sorry to go off topic but I'm at my wits end and need a clue to point me in the right direction.

Dec 28th, 2009, 20:41	#12
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	I'd suggest you do a compression check. And yes the flash code reader will work, pin 3 for the fuel ECU and pin 1 for the ignition.

Dec 29th, 2009, 11:06	#13
Yamdy68 New Member Last Online: Dec 31st, 2009 08:17 Join Date: Dec 2009 Location: Leicester	Compression was my next move but I haven't got a gauge so I'll try to get one later. I'll have another go with the flash reader and try pin 1 as well but it won't be until tomorrow now - I've got to take the Wife to Ikea today!! (if my old 940 makes it up to Nottingham) Cheers

Dec 30th, 2009, 11:24	#14
Yamdy68 New Member Last Online: Dec 31st, 2009 08:17 Join Date: Dec 2009 Location: Leicester	Ok, compression test done and readings extremely low, between 70 & 95 ! They increase up to 130 to 145 with oil in bores. I'm going to give up on this and get rid as a non runner. I've not had the car long and a few things I've found (missing bolts, iffy electrics and a thermostat butchered to fit cos' it's the wrong one!) suggest it has been bodged in the past so it's not worth spending any more time and effort on. I tried the flash reader in port 1 and it worked great 1-1-1 no fault, but still couldn't get it to work in 3. Thanks for all assistance, I'm now on the lookout for a replacement !

Apr 4th, 2010, 01:23	#17
whoa Junior Member Last Online: May 18th, 2010 20:29 Join Date: Mar 2010 Location: San Francisco	Put it in a box with a button and a connector, and life is easy: The car rewarded me for my effort with a 1-1-1.

Apr 24th, 2010, 00:08	#20
jackjon13 New Member Last Online: Apr 24th, 2010 00:18 Join Date: Apr 2010 Location: Hereford	I also have a '96 850 with the B2524S coupled to the 4 speed auto, is the ECU for the engine clearly labelled as to whether it is a motronic 4.3/4.4 or jetronic? Also does anyone know if these ECUs are flash ECUs or not? Cheers, John.

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