Fuel Injection System Error

[wpoll]

Originally Posted by UPGrayd

Update with codes.

So I managed to get some time to cruise over to my friends place and pull all the codes from my X5....It had 8 stored in memory, One that was really of interested to me.

It had 42 12 24, 42 22 24, 42 32 24, 42 42 24, 40 A1 32, 4B 90 31, 45 60 11 and 45 90 11

After clearing them all, I started the car and monitored, after about a minute of idling the first 5 codes returned but the last 3 did not, The car was not misbehaving in any way and was driving fine. I'm guessing the last 3 will return when it stalls next.

4212,4222, 4232, and 4242 indicate the first four glow plugs are dead, or the glow controller is dead. Or both. Replace all glow plugs and the controller.

40A1 is an alternator issue. Check alternator output etc.

4B90 (low rail on start), 4560 and 4590 are all indicating low rail pressure.

It could be an intermittent fuel flow regulator on the HPFP. But it could be a few other items also....

[andrewwynn]

Alternator issue likely a cascade fault; engine not turning enough rippums to get proper power out of the alternator.

Would it make more sense the glow plug controller since what is the odds four plugs are all broken?

[wpoll]

Originally Posted by andrewwynn

Alternator issue likely a cascade fault; engine not turning enough rippums to get proper power out of the alternator.

Would it make more sense the glow plug controller since what is the odds four plugs are all broken?

Alternator faults returns prior to stalling issue so not related.

Very likely to have glow plug failure. They only last 100,000km and fault out (open/short) due to number of heating/cooling cycles.

The controller is also known to go bad (same welded joints as ABS controller) so just replace the lot....

[andrewwynn]

Smart thinking


Sent from my iPhone using Tapatalk Pro

[UPGrayd]

I'll put a new glow plug controller in it and see if that resolves the glow plug fault codes, if not i'll give it a set of new glow plugs.

Re: the fuel rail pressure, Is there any procedure to isolate and test/replace just the flow regulator on the hpfp? I'm hesitant to start throwing major parts at it without being 100% sure (or as sure as one reasonably can be).

[wpoll]

There is a diagnostics process...

https://www.newtis.info/tisv2/a/en/e...ontrol/2wZTOhh

[UPGrayd]

Update:

The new ignition switch arrived today. spent 15-20 minutes putting it in (it was alot more fiddly than I expected it to be)....I wont know if it resolved the issue until well...until it doesn't die again i guess...Having said that, it may well just be the placebo effect, but I can hear the in tank and in line pumps alot louder now (I could never really hear them at all before), and power delivery seems significantly smoother and stronger) again, may very well just be the placebo effect...Spent probably 3-4 hours driving around and doing christmas shopping at various different places with no issue whatsoever...so hopefully thats sorted it.

Either way I have ordered a new glow plug control module

[UPGrayd]

Update with some good, and some bad news.

Bad news is..the problem remains....Good news is, the vehicle now will not start at all with the problem moving from intermittent to persistent..So that should make the issue easier to track down....

Focusing on the 4B90, 4560 and 4590 codes. Would they be likely to be thrown by a failed in tank, or inline pump causing pressure to drop before the hpfp or are there other codes for low pressure before the hpfp?

[UPGrayd]

Should probably update this.

swapped out the fuel pump relay with the horn relay, Symptoms moved from "persistent" to "non existent". All codes cleared, None have returned....

New relay ordered, New relay sitting on shelf because car is running without issue and I cant be bothered pulling the fuse box out again to change the horn relay lol.

[wpoll]

Thanks for the follow-up!!