P0100 - Mass airflow meter 1 circuit/open

P0380 Glow plug/heater circuit 1
Need to check the glow plug resistance and wiring back to relay is ok. If nothing is found, replace the relay.

 

I looked at your PP2000 data associated with P0100 and I see the MAF is giving a very low reading 6mg/stroke compared with the setting 294 mg/stroke which suggest to me the MAF is not reading the airflow. I have attached another diagram which contains a lot of the same information RedSector has provided but it also shows that the MAF sensor gets power from fuse 1 in the engine compartment fuse box. It would be worth checking that fuse.

I have also attached a location diagram for earth MC12. One of RedSector tests is intended to check that earth connection but it is worth knowing where it is.

 

Hello everyone, I own a 307 2.0 HDI 110hp RHS.
I got a Lexia diagnostic tool and read the ecu errors.
The car had a lot of errors, but after deletion they did not return, except for P0100, P0380, P1421.

Your screenshots from PP2000 give the fault codes and diagnostic data. PP2000 normally give a high level fault description and if you click on it it gives your the data you posted. Was there a fault description for P1421. It normally relates to a fault with the upstream temperature sensor but in your case it seems to be giving a reading. However, the air temperature reading of -18˚C seems to be very odd. I wonder if this came from the temperature sensor in the MAF sensor.

 

Hello everyone, thanks for your help, I was able to solve the P0100 maf sensor error, the problem was with the installation and the connector.
No more MAF sensor error now, P1421 error is still there but that is probably because the dpf was removed so the probe is probably damaged. The car is still unmapped, but I removed the fap and additive pump via Lexia diagnostics (set instead of present to absent), works fine.
When I tested the parameters, I got a turbo pressure of 988mbar at idle, the reference pressure is 1200mbar.
The turbo solenoid valve OCR shows 88% and nothing more than that, at higher revs the % just drops. Whether that valve should open 100% or not, and whether the reference pressure must match the measured one. I tested the car while driving in third gear at about 3000 rpm and the reference pressure is about 2200mbar and the measured pressure is the same. Does this mean the turbo solenoid valve is bad and needs to be replaced?

The egr valve is 99% open at idle and 5% at high revs, is that ok?

 

In the case of P1421 I think the attachment shows the two temperature sensors. It looks to me that the downstream temperature sensor fits into the DPF but if you have removed the DPF I am puzzled you were getting a downstream temperature reading in the diagnostics.

Normally the turbo pressure is read by the manifold pressure sensor (MAP). I would expect the actual turbo pressure to be closer to the reference pressure. Is there an air leak between the turbo and manifold?

I am not sure about the EGR. One theory I read suggested that at idle the engine doesn't need to deliver a lot of power so you can fully open the EGR. When you need maximum power you want as much fresh air as possible so the EGR should shut. Based on this theory your figures seem correct.