2,0 CDTi and MAF data - Page 2

Thomson · 29th September 2008, 18:38

I found in Rave service manual any data for MAF sensor and the lowes is 15 kg/h (4,16 g/s) and i hope it is in idle 780 rpm. Tomorrow i will check MAF by using multimeter on wire coming from MAF to ECM. I hope it helps me in my situations.

Thomson · 4th October 2008, 13:56

I measured MAF voltage input and output. I have on yellow wire 2,12 V (when cold engine 2,16 V) and on red yellow wire 5,06 V. Rave worksop manual shows yellow wire like MAF signal to ECM and red yellow wire like supply from ECM to MAF. I think it is not to big difference between data what sendet Keith (2,09 V). But if i recount flow rate on Keiths diagram i get big difference between my MAF and good MAF. 487,6 mg/stroke in 780rpm.

487,6 : 1000 = 0,4876 g/stroke
780 : 60 = 13 rps
0,4876 * 13 = 6,33 g/s

6,33 g/s GOOD MAF

I hope i'm right. So if i have 12 g/s the MAF must be bad independently on voltage what i measured.

FrenchMike · 5th October 2008, 16:53

Quote:

Originally Posted by Thomson

I measured MAF voltage input and output. I have on yellow wire 2,12 V (when cold engine 2,16 V) and on red yellow wire 5,06 V. Rave worksop manual shows yellow wire like MAF signal to ECM and red yellow wire like supply from ECM to MAF. I think it is not to big difference between data what sendet Keith (2,09 V). But if i recount flow rate on Keiths diagram i get big difference between my MAF and good MAF. 487,6 mg/stroke in 780rpm.

487,6 : 1000 = 0,4876 g/stroke
780 : 60 = 13 rps
0,4876 * 13 = 6,33 g/s

6,33 g/s GOOD MAF

I hope i'm right. So if i have 12 g/s the MAF must be bad independently on voltage what i measured.

Hello,unfortunately i have no T4 so,
I noted on my engine (it is Ok) the electric values picked throw the insulation
of the yellow wire:
key pos 2(engine stopped):1 volt
engine on idle :2 volts
engine at 3000 rpm :3.5 volts

I hope that will help

Thomson · 16th October 2008, 16:33

Problem solved. I put new and original MAF and vehicle is driving well (i think) but on my OBD reader show same data what before so i don't know. For me is important fact that engine is powerful under 2000rpm.
Thank you for yours help.

29th September 2008, 18:38	#11
Thomson Newbie Rover 75 2.0 CDTi Tourer (facelift) Join Date: Feb 2008 Location: Czech Republic Posts: 27 Thanks: 0 Thanked 0 Times in 0 Posts	I found in Rave service manual any data for MAF sensor and the lowes is 15 kg/h (4,16 g/s) and i hope it is in idle 780 rpm. Tomorrow i will check MAF by using multimeter on wire coming from MAF to ECM. I hope it helps me in my situations.

4th October 2008, 13:56	#12
Thomson Newbie Rover 75 2.0 CDTi Tourer (facelift) Join Date: Feb 2008 Location: Czech Republic Posts: 27 Thanks: 0 Thanked 0 Times in 0 Posts	I measured MAF voltage input and output. I have on yellow wire 2,12 V (when cold engine 2,16 V) and on red yellow wire 5,06 V. Rave worksop manual shows yellow wire like MAF signal to ECM and red yellow wire like supply from ECM to MAF. I think it is not to big difference between data what sendet Keith (2,09 V). But if i recount flow rate on Keiths diagram i get big difference between my MAF and good MAF. 487,6 mg/stroke in 780rpm. 487,6 : 1000 = 0,4876 g/stroke 780 : 60 = 13 rps 0,4876 * 13 = 6,33 g/s 6,33 g/s GOOD MAF I hope i'm right. So if i have 12 g/s the MAF must be bad independently on voltage what i measured.

16th October 2008, 16:33	#14
Thomson Newbie Rover 75 2.0 CDTi Tourer (facelift) Join Date: Feb 2008 Location: Czech Republic Posts: 27 Thanks: 0 Thanked 0 Times in 0 Posts	Problem solved. I put new and original MAF and vehicle is driving well (i think) but on my OBD reader show same data what before so i don't know. For me is important fact that engine is powerful under 2000rpm. Thank you for yours help.