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Fuel Pump module issue?

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Hi guys,

I have a very strange issue and took me two weeks to find out exactly what's going on. Last night I figured it out what's happening but still don't know how to sort it and why it's doing that yet.

 

For the past 2 weeks, every time I put the key in ignition I faced a yellow steering lock and the car didn't start at all, but as soon as I put the ignition on, the wipers got mental, radio not turning on and the ABS on, steering lock disappeared. Last night, same thing happened, but I plugged DIS straight away to see what's the issue. When tried to see if started, just cranked but didn't start at all.

 

Apparently DIS said "Control unit cannot be detected" for the "EKPS Fuel-pump control. Asked me if I still want to enter it and clicked yes, carried on testing until got to the IHR Integrated heater control and again popped up "Other control unit variant detected". When it got to the CAN (the last module to test in DIS) it actually cut the connection. Straight after, the car started to work again, the fuel pump started, radio etc. and the car was fully operational again, however, the CAN re-issued the connection without doing anything and suddenly everything was connected again. After this DIS showed that under FRM module, 9CCF (Communication with LIN operator unit disturbed).

 

At the moment, the only way to be able to start the car is that, unlock the car and plug then key in then the steering lock shows up, remove key, get out of car and lock it, 5 mins later, unlock it, put the key back in ignition and it's working again. Next time, same thing again. Also, found out that, I tried it yesterday morning, the steering lock popped up, locked and went to work. Last evening came from work, tested and it was working on the first insert of the key, which leads me to believe the car didn't go into sleep mode again for the whole day. Now, when steering lock is on and then the wipers start mental, radio off and car doesn't start, makes sense, because the fuel pump doesn't start either. After 2 mins leaving the ignition on, the car comes back to life by itself and starts working again, all errors disappear and all good to go.

 

Has anyone any clue what is wrong with it, or what should I check?

 

I'd really appreciate any help. Thank you

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Good luck with that :lol: could be anything.  A short to ground in a harness or a moisture in a module perhaps or the clockspring on the steering wheel.  I'd pick the easiest circuit to test. You already know it has power and grounds because it can and does eventually work. Get a wiring diagram from TIS and start working towards the modules/Canbus/ecu All the affected systems will almost certainly be connected somewhere. There will be a common point and thats where I'd start looking. 

Edited by Deviant

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Thanks a lot Deviant. Well I was thinking it might be from the fuel pump module since DIS couldn't find that module and eventually skipped it and by the time DIS got to the CAS everything started working fine.

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4 hours ago, BMW.Enthusiastic said:

Thanks a lot Deviant. Well I was thinking it might be from the fuel pump module since DIS couldn't find that module and eventually skipped it and by the time DIS got to the CAS everything started working fine.

 

The fuel pump module doesn't control the radio or the wipers. Canbus is probably the culprit.  

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13 hours ago, Deviant said:

 

The fuel pump module doesn't control the radio or the wipers. Canbus is probably the culprit.  

Thanks a lot for your reply. Last night I updated the CAS and still the same issue but now the only thing shows up it's the steering lock but again it's cranking and not starting, I believe the fuel pump didn't receive signal by that time yet. Do you think could be from the ELV?

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Absolutely. If you've cured the other issues. If the steering is locked I wouldn't expect the pump to work if the ignition isn't on. Although you say it is, If you turn the ignition on but don't start the engine, you should be able to hear the fuel pump running. If you had a traditional key ignition barrel, you could have wiggled it and played around with it to test it. 

 

A wiring diagram would help too. 

Edited by Deviant

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25 minutes ago, Deviant said:

Absolutely. If you've cured the other issues. If the steering is locked I wouldn't expect the pump to work if the ignition isn't on. Although you say it is, If you turn the ignition on but don't start the engine, you should be able to hear the fuel pump running. If you had a traditional key ignition barrel, you could have wiggled it and played around with it to test it. 

 

A wiring diagram would help too. 

Thanks for your reply. Well, just realised this morning, I updated the CAS last night but didn't remove the errors and reset the counter after the update. The ELV seems to operate fine, every time I put the key in ignition it unlocks the steering wheel, then put the key in the ignition and the yellow steering lock welcomes me into the car. As far as I know, the new CAS firmware should turn off the ELV and leave it on 'open' but I'll check that tonight through NCS.

 

What doesn't make sense to me, as soon as I put the key in ignition, the steering wheel gets unlocked so you can move it, but the fuel pump doesn't get the right signal and doesn't get power at all. I need to keep the car with the ignition on for at least 2 min and then suddenly radio starts, fuel pump and whatever else didn't at first or get out of the car, lock it and returning back to it after 10 mins then it will operate as normal. If I remove the key when the steering lock in on, the ELV won't lock the steering wheel anymore.

 

I'll be having an attempt tonight to see what values are for the ELV in the new CAS firmware and try to see if the self-test is still on, whenever you open the door. Any other suggestions will be highly appreciative. Thanks a lot buddy :)

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You could easily blame all of the symptoms on the steering locks except the wipers. Whilst they need the ignition on to work, they shouldn't start on their own which makes me wonder about the Canbus. 

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1 hour ago, Deviant said:

You could easily blame all of the symptoms on the steering locks except the wipers. Whilst they need the ignition on to work, they shouldn't start on their own which makes me wonder about the Canbus. 

Well you're very right on this point. They starts if I put the ignition on, otherwise they won't. But as far as I've read online, the steering lock could be coded out using NCS or CAS update and should sort it out. Do you know anything about?

 

Thank a lot :)

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No idea. You're best looking on bmw coding forums or hopefully someone knowledgeable on here knows. Googling the German for steering lock is all well and good, but you need to know which module needs coding. I do have software which makes using ncs easier. 

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