850 t5 lambda light

snarkosnarko · Jun 21st, 2018, 12:59

Hello folks
Lambda light came on yesterday whilst driving.
Have plugged in vol-fcr today
The only "codes" present is in the immobilizer 2 section,
Unknown DTC FF
Lambda light has not reset and codes will not clear.
Any ideas?
Cheers

scutyde · Jun 21st, 2018, 14:54

Vol Fcr can not read the M4.3 from the 850. Delphi DS150e can. If the car is MY96 or 97 it can even show you live data.
Alternatively you can solder yourself a self made blinking box which can read and erase the fault codes.

snarkosnarko · Jun 21st, 2018, 16:21

If it's any help ecu is 4.4

scutyde · Jun 22nd, 2018, 09:40

The stock 850 T5 had the M4.3 ECU, there are M4.4 mods. Anyway in that case you need to reroute the cables in the OBD Port in order for VolFcr to be able to talk to the M4.4.
OBD Pin 3 goes to Diagnose cable Pin 7
OBD Pin 5 goes to Pin 5
OBD Pin 16 goes to Pin 16.

Only the 20V N/A engine from 96 onwards had the M4.4 and the 850 AWD with the LPT engine from MY97 had M4.4.
If yours is a AWD then you do not need to reroute the wires.

snarkosnarko · Jun 25th, 2018, 16:37

Eventually read code 2-3-2 and traced to broken vacuum pipe underneath inlet manifold.
I replaced PCV and vacuum pipes today and now all is well.

Bigfella666 · Jun 26th, 2018, 09:40

Snarks

Out of interest how did you read the DTC ?

snarkosnarko · Jun 27th, 2018, 17:20

Didn't quite understand scutydes information so I tried reading codes using home made blinker in pins 3 5 and 16 first and that seemed to work.

Bigfella666 · Jun 27th, 2018, 17:30

Cheers for that Snarks.

I was confused also especially as I thought the girls were all Mo 4.4 in turbo format ?

Jun 21st, 2018, 12:59	#1
snarkosnarko Junior Member Last Online: Yesterday 10:08 Join Date: Mar 2007 Location: nuneaton	850 t5 lambda light Hello folks Lambda light came on yesterday whilst driving. Have plugged in vol-fcr today The only "codes" present is in the immobilizer 2 section, Unknown DTC FF Lambda light has not reset and codes will not clear. Any ideas? Cheers

Jun 21st, 2018, 14:54	#2
scutyde Retrofit master Last Online: Mar 28th, 2022 10:14 Join Date: Mar 2010 Location: Berlin	Vol Fcr can not read the M4.3 from the 850. Delphi DS150e can. If the car is MY96 or 97 it can even show you live data. Alternatively you can solder yourself a self made blinking box which can read and erase the fault codes. __________________ Volvo 850 2.5 20V MY95 Pictures Here what I retroffited so far List

Jun 22nd, 2018, 09:40	#4
scutyde Retrofit master Last Online: Mar 28th, 2022 10:14 Join Date: Mar 2010 Location: Berlin	The stock 850 T5 had the M4.3 ECU, there are M4.4 mods. Anyway in that case you need to reroute the cables in the OBD Port in order for VolFcr to be able to talk to the M4.4. OBD Pin 3 goes to Diagnose cable Pin 7 OBD Pin 5 goes to Pin 5 OBD Pin 16 goes to Pin 16. Only the 20V N/A engine from 96 onwards had the M4.4 and the 850 AWD with the LPT engine from MY97 had M4.4. If yours is a AWD then you do not need to reroute the wires. __________________ Volvo 850 2.5 20V MY95 Pictures Here what I retroffited so far List

Jun 21st, 2018, 16:21	#3
snarkosnarko Junior Member Last Online: Yesterday 10:08 Join Date: Mar 2007 Location: nuneaton	If it's any help ecu is 4.4

Jun 25th, 2018, 16:37	#5
snarkosnarko Junior Member Last Online: Yesterday 10:08 Join Date: Mar 2007 Location: nuneaton	Eventually read code 2-3-2 and traced to broken vacuum pipe underneath inlet manifold. I replaced PCV and vacuum pipes today and now all is well.

Jun 26th, 2018, 09:40	#6
Bigfella666 Premier Member Last Online: Apr 1st, 2024 13:31 Join Date: Sep 2015 Location: London	Snarks Out of interest how did you read the DTC ?

Jun 27th, 2018, 17:20	#7
snarkosnarko Junior Member Last Online: Yesterday 10:08 Join Date: Mar 2007 Location: nuneaton	Didn't quite understand scutydes information so I tried reading codes using home made blinker in pins 3 5 and 16 first and that seemed to work.

Jun 27th, 2018, 17:30	#8
Bigfella666 Premier Member Last Online: Apr 1st, 2024 13:31 Join Date: Sep 2015 Location: London	Cheers for that Snarks. I was confused also especially as I thought the girls were all Mo 4.4 in turbo format ?

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