2.0 HDi MAF sensor issue

[Sahloul]

Hi

I hope you're all well. 

I have a partner 2.0 hdi (Berlingo's twin), it's an 04. 
My car has the infamous judder in 4th gear at 40-50 Km/h. I've read that a bad MAF sensor can do that. 
So i plug in my trusted tool and scan with PP2000 and I get this fault in the picture (sorry it's in French,  app is in french). 

I've unplugged the EGR valve and put a bolt on the tube so I'm guessing that's what the EGR fault is.

It says: Permanent fault: MAF sensor signal fault. Short circuit to ground or open circuit.

Unplugging the MAF sensor has no impact on the car's performance, at least nothing I can feel.

Tried a second hand MAF sensor but still the same error.

What could this possibly be? 

Is it normal that it's showing the circuit as open? 

I'm starting to worry if the connector itself has a break somewhere along the line? Any way to test? Thanks.

[Sol]

It could be a break in the wiring. You would have to trace between the MAF sensor wires and the ECU itself with a multimeter and the schematic. If there's no MAF then it should just apply the default airflow values and carry on.

This would lead me to think you have damage to the wiring harness.

[Sahloul]

It could be a break in the wiring. You would have to trace between the MAF sensor wires and the ECU itself with a multimeter and the schematic. If there's no MAF then it should just apply the default airflow values and carry on.

This would lead me to think you have damage to the wiring harness.

Hi

Thank you very much for your response.

Do you happen to have the schematics or know where I can find them? 

My next plan of action would be to test for continuity to th ECU from the MAF sensor wires. Just need schematics.

Don't mean to lead anyone down any incorrect paths, but is that something common? ? a break in the wires?

[Sol]

Ok, DW10 engine schematics, engine fusebox and layouts attached.

Item 1310 is the air flow meter.

Components pdf shows what each item is called by Citroen in the diagrams.

[Sahloul]

Ok, DW10 engine schematics, engine fusebox and layouts attached.

Item 1310 is the air flow meter.

Components pdf shows what each item is called by Citroen in the diagrams.

Thank you very much!!! 

My my, this looks like a nightmare to trace ?
But then again, I'm not good with schematics ? 

I'll see what I can do. Thank you

[Sol]

Ok for something easy to try, Fuse F8 feeds a relay which powers the air flow meter. Also does:

all or nothing solenoid valve (EGR) -
air flowmeter -
Engine management ECU - slow speed cooling fan relay -
Throttle opening electrovalve (DW8B) - diesel injection pump (DW10TD) -
Diesel high pressure regulator.
(DW10TD)

It's shown in the PSF1 document I attached, which is the engine bay fusebox. Check that fuse, it could be blown or oxidised - if it's blown then replace it, if the legs are dull grey, rub them with fine sandpaper and reinsert it. This would likely cause the issue you have, the relay can't be identified, but is built into the fusebox base.

The MAF is powered from plug 16V NR on the fusebox which means 16 pin, Black. It is wired to  Pin 8. This is on the pdf I sent.

[Sahloul]

Ok for something easy to try, Fuse F8 feeds a relay which powers the air flow meter. Also does:

all or nothing solenoid valve (EGR) -
air flowmeter -
Engine management ECU - slow speed cooling fan relay -
Throttle opening electrovalve (DW8B) - diesel injection pump (DW10TD) -
Diesel high pressure regulator.
(DW10TD)

It's shown in the PSF1 document I attached, which is the engine bay fusebox. Check that fuse, it could be blown or oxidised - if it's blown then replace it, if the legs are dull grey, rub them with fine sandpaper and reinsert it. This would likely cause the issue you have, the relay can't be identified, but is built into the fusebox base.

The MAF is powered from plug 16V NR on the fusebox which means 16 pin, Black. It is wired to  Pin 8. This is on the pdf I sent.

I'm gonna take a shot at this and post updates. 

You're a life saver. Thank you

[Jehu40]

No updates? It's worth checking the air filter too; changing mine eliminted the judder.