D5 (Euro4) correction figures.

Darbyflyer · May 31st, 2021, 08:46

Hi folks, can anyone help me understand these correction figures? I fitted a reconditioned injector recently and have found any power application to be rough / lumpy.

Cylinder 5 had a replacement injector back in January as it had a Euro 3 injector in and was fine. Cylinder 1 had one at the start of May and doesn’t feel as good.

Coding was done with vdash. The results are as follows.

Before:

C1. 0.23/-0.21
C2. 0.1/-0.5
C3. 0.05/-0.06
C4. 0.15/0.05
C5. 0.07/-0.05

After:

C1. -1.76/-2
C2. 0.07/0.02
C3. 0.64/0.54
C4. 0.78/0.68
C5. 0.63/0.45

The replacement injector in cylinder one seems to have a huge difference with the figures. I’m planning on putting the old one back in, but would like to understand what it means. All I know is that it shows if the ECU is increasing or reducing the amount of fuel being applied.

Is my recent replacement injector faulty?

Thanks.

Mattye · May 31st, 2021, 20:32

Hi Derbyflyer,
From a previous but related post I quoted the below:
"When you perform the test the tolerances are actually shown right at the bottom of the VIDA page. It states "If the fuel corrections have been +2.3 mg/cycle or higher alternatively -2.3 mg/cycle or lower, on any of the cylinders during the test procedure, this means that there is a malfunction" This is for my 2006 V70 D5."
What Volvo are you measuring the values for?
Matt

Darbyflyer · May 31st, 2021, 21:20

Thanks for the reply. I’m testing on a 2007 XC90 D5

Mattye · Jun 1st, 2021, 08:56

So your correction figures will be the same as mine.

Darbyflyer · Jun 1st, 2021, 12:04

So am I right in thinking that the importance is the difference in the MAX and MIN figures as opposed to what they actually are?

May 31st, 2021, 08:46	#1
Darbyflyer New Member Last Online: Dec 21st, 2023 17:03 Join Date: Aug 2020 Location: Loughborough	D5 (Euro4) correction figures. Hi folks, can anyone help me understand these correction figures? I fitted a reconditioned injector recently and have found any power application to be rough / lumpy. Cylinder 5 had a replacement injector back in January as it had a Euro 3 injector in and was fine. Cylinder 1 had one at the start of May and doesn’t feel as good. Coding was done with vdash. The results are as follows. Before: C1. 0.23/-0.21 C2. 0.1/-0.5 C3. 0.05/-0.06 C4. 0.15/0.05 C5. 0.07/-0.05 After: C1. -1.76/-2 C2. 0.07/0.02 C3. 0.64/0.54 C4. 0.78/0.68 C5. 0.63/0.45 The replacement injector in cylinder one seems to have a huge difference with the figures. I’m planning on putting the old one back in, but would like to understand what it means. All I know is that it shows if the ECU is increasing or reducing the amount of fuel being applied. Is my recent replacement injector faulty? Thanks.

May 31st, 2021, 20:32	#2
Mattye Member Last Online: Apr 8th, 2024 15:10 Join Date: Jul 2020 Location: Oxford	Hi Derbyflyer, From a previous but related post I quoted the below: "When you perform the test the tolerances are actually shown right at the bottom of the VIDA page. It states "If the fuel corrections have been +2.3 mg/cycle or higher alternatively -2.3 mg/cycle or lower, on any of the cylinders during the test procedure, this means that there is a malfunction" This is for my 2006 V70 D5." What Volvo are you measuring the values for? Matt

May 31st, 2021, 21:20	#3
Darbyflyer New Member Last Online: Dec 21st, 2023 17:03 Join Date: Aug 2020 Location: Loughborough	Thanks for the reply. I’m testing on a 2007 XC90 D5

Jun 1st, 2021, 08:56	#4
Mattye Member Last Online: Apr 8th, 2024 15:10 Join Date: Jul 2020 Location: Oxford	So your correction figures will be the same as mine.

Jun 1st, 2021, 12:04	#5
Darbyflyer New Member Last Online: Dec 21st, 2023 17:03 Join Date: Aug 2020 Location: Loughborough	So am I right in thinking that the importance is the difference in the MAX and MIN figures as opposed to what they actually are?

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