Support for the 2010 Model Peugeot 308 1.6 THP Electrical installation diagram

[Altunsoy]

Hello, I have a fuel problem with my vehicle and I haven't solved it yet. The car is burning too much fuel. The Maf sensor, upper Lambda sensor, VVTI valve, and PCV valve (upper cover) have been recently replaced. The High Pressure pump has been recently overhauled. Injector corrections have been flawless. I used Rislone additive for catalytic converter cleaning, but I couldn't solve the rich mixture problem. The upper oxygen sensor always says rich mixture in the fuel parameters, and the upper oxygen sensor voltage is around 1479.55 mV (millivolt). The oxygen sensor is a Bosch 5-wire type. I've heard that there are problems with the oxygen sensor sockets on these engines. If anyone has access to the system, can they provide me with the electrical installation document for vehicle chassis number VF3**************[VIN obfuscated, can be read by forum staff]? Thank you in advance for your help.

[mickthemaverick]

I'm afraid I don't have access to the system to get the diagram from your VIN but hopefully another member will see your query and help out.

[xantia_v6]

How much fuel is the vehicle consuming? These are not very economical at the best of times.

Have you checked with an external gas analyser that the mixture is actually rich? I am surprised the the fuel trims are in normal range.

The injection wiring diagram for the 5DT engine (encoded as 5FT in your VIN) is:



The O2 sensors are 1352 and 1357

For siring codes, see: https://frenchcarforum.co.uk/forum/view ... hp?t=80489

[Altunsoy]

mickthemaverick and xantia_v6, thank you for your help. The vehicle is failing exhaust emission measurements, the values ​​are very high, I noticed something today, I saw the schematic just now, but before I did, I connected a multimeter to the oxygen sensor socket and checked which of the engine ECU connectors I was reaching one by one There are 6 wires, and I got the signal from the 4 on the sides to the middle connector of the engine ECU, but I can't upload a picture. I couldn't get any signal from the 3 and 4 middle cables. Could this be the problem? What are your thoughts? Thanks.

[Altunsoy]

In the picture I added, I couldn't get a signal from the 3 and 4 pins in the middle to the engine brain sockets. In the diagram you sent me, are these 1263 and 1351 B? Which of the 3 sockets on the engine brain are these in?

[xantia_v6]

What are the emissions measurements?
Are there any engine fault codes?

[Altunsoy]

I check with diagbox and there are no error codes.

[Altunsoy]

When a vehicle is inspected in Turkey, a measuring device is inserted into the exhaust to check whether it's burning fuel within the standards. My car failed this inspection because it had very poor readings. They check to see if it's emitting harmful gases.

[Paul-R]

Yes, same in the UK. But what are those readings? NOx too high? Carbon monoxide too high? Unburnt fuel too high? Or what? Exact figures would help.

[Altunsoy]

Unfortunately, I haven't seen the values. The technician said this vehicle is burning bad fuel. I also have a screenshot of the diagbox. The upper oxygen sensor voltage is 1479.55 mV millivolts, which is very high. It also goes up and down to around 1500 while the vehicle is running. If you suddenly take your foot off the gas pedal when accelerating, it rarely says "Lean mixture." Otherwise, it's always a rich mixture. The exhaust fumes smell bad anyway.

[Altunsoy]

Selam.

[Altunsoy]

Hello everyone. First of all, I apologize for bothering you. I double-checked the connectors using the electrical circuit diagram you provided. Initially, I was overjoyed to find the problem when I saw that there were two cables with problems. However, when I checked the diagram, I saw that the signal terminals of all the upper and lower oxygen sensor cables were connected to the middle connector of the engine computer. Just to be safe, I even slightly tightened the pins of the upper oxygen sensor inside the connector. After reconnecting the oxygen sensor cable, I measured the back of the cable to the engine computer and checked for a signal. The signals were fine. The car isn't starting now, only with the ignition on, and the upper oxygen sensor voltage fluctuates between 1499.20 mV and 1494.20 mV. Even when the car isn't running, I'm going crazy with this. What could be the problem?