INJECTOR PROGRAMMING

[LAWRENCE NJUGUNA]

Hi. i have Citroen Relay 2009 that has error code p1304 after diagnosis and worse the vehicle would not start. After cranking it many times found out the socket to the crank shaft sensor was loose. put i it back, the check engine light disappeared, but the vehicle would still not start. Error code p1304 indicates that the injector learning not performed. Problem is that the injectors cannot be programmed as the injector codes have been rubbed off and not visible at all. VIN NO is VF7**************[VIN obfuscated, can be read by forum staff] CITROEN RELAY 3. Question is how do i get the original injector codes for the nozzles to program them into the ECU to clear the error code and hopefully start the vehicle. Thanks in advance.

[GiveMeABreak]

You can't really - that's why each of these have a unique code on the injector as each injector is calibrated individually. Without the codes, the engine ECU won't be able to fine tune injector flow / pattern. So unfortunately you may have to fork out for some new or reconditioned injectors - and they will come with new codes.

[xantia_v6]

I would be surprised if lack of injector programming was the cause of non-start.

[GiveMeABreak]

Absolutely - it would probably run a bit rough, but there's something else going on there.

[Doo]

Hi. i have Citroen Relay 2009 that has error code p1304 after diagnosis and worse the vehicle would not start. After cranking it many times found out the socket to the crank shaft sensor was loose. put i it back, the check engine light disappeared, but the vehicle would still not start. Error code p1304 indicates that the injector learning not performed. Problem is that the injectors cannot be programmed as the injector codes have been rubbed off and not visible at all. VIN NO is VF7**************[VIN obfuscated, can be read by forum staff]**************[VIN obfuscated, can be read by forum staff] CITROEN RELAY 3. Question is how do i get the original injector codes for the nozzles to program them into the ECU to clear the error code and hopefully start the vehicle. Thanks in advance.

As suggested, coding injectors won't stop the engine from starting. Crack open an injector union to ensure fuel is actually flowing. From experience, these engines are hard to bleed in certain instances (after changing the fuel filter is a usual) so first make sure there is fuel getting to the injectors. You really should have a decent code reader to see what is going on. Most will tell you the codes attributed to each injector previously (although if injector(s) have been changed then you won't know, but if they are original or have been coded before, the codes will be stored in the ECU so you can copy & paste).

If the vehicle has a lift pump in the fuel tank, make sure it is working to capacity. Look for blocked fuel lines & filter or at the pick up point in the tank. A good code reader will let you look at live data and will almost always tell you the expected flow rate against what the given flow rate is. So if it states 13 bar and you're showing 2 bar, you have a pressure problem.

So look to see if there is a lift pump & is it working. Check the high pressure pump is moving fuel. If not, why not? That's when you need to start at the tank fuel pick up and work forward. If all seems to be working, it is possible you may need to try some ether in the intake, but just a sniff. Too much can cause a runaway and that's not good.

Engine light off usually means all the sensors are working within parameters so it has to be a manual issue. Perhaps a stone hit a fuel line causing a flow issue. Maybe an "O" ring has been disturbed causing it to draw air. There are so many possibilities it's hard to diagnose from a computer thousands of miles away.....

[LAWRENCE NJUGUNA]

Hi, i have come to learn from the previous owner of the Citroen Relay 2009 that there has been a complete lock set i,e a used ECU unit coming with an ignition barrel, a trasponder and a key for a similar vehicle imported from the UK plug and play fitted into the vehicle and the vehicle has been running for a good two and a half years with the original injectors nozzles working just fine with no issues. When i bought it, it had started though with a bit of a struggle but the engine management light came on. after diagnosis, the code reader indicated that i replace the EGR valve, glow plugs and Glow plug relay. i imported them from UK and replaced, that is when the vehicle failed to start. The memory on the ECU kept the injector codes of the previous vehicle from where the Ecu had been plugged off. The fuel from the intank pump to the filter , high pressure pump and to the common rail is fine. When i remove two injectors from the pods and connected to power sockets and try to start, no spay. Could i be having a problem with the ECU not releasing the signal/power or what is the sequence followed as a check with a meter to check the power to the injectors for the injectors to open and spray the meter reads no flow because when you attempt to start it cranks as though it is going to start. Kindly your advise is desperately need here.

[GiveMeABreak]

With this new information it sounds to me like the engine ECU is possibly locked. When this happens the engine will turn over but not start - it's as if the engine ECU is not authorising the start like an immobiliser problem.