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R52 turns over but won’t start...!

2263 Views 2 Replies 3 Participants Last post by  mike1967
I'm hoping someone can help with this particularly annoying problem...
A few weeks ago, my wife drove home from work, parked on the drive and locked the car up. No problem. A few days later, went out to it, tried to start it and ran the battery down as it just refused to fire and she refused to give up trying until the battery gave up first.
A friend brought up a diagnostic laptop and the only (relevant) fault code was P1692 which appeared to point towards a throttle body problem; the friend decided it probably wasn't that and we explored other options.
I pulled a spark plug and turned it over - no spark.
I checked the fuel and none was being pumped to the engine.
Also, when turning on the ignition, I noticed there wasn't the usual sound of the fuel pump initialising...
Firstly, on advice, I changed the crank position sensor - no change.
I checked all of the fuses in the engine bay box and the cockpit panel - all ok (including the 40, 50 and 100 metal ones underneath the engine bay box).
I removed the fuel pump and tested that and it was fine, although checking the wiring in the multi-plug showed no feed was getting to it. The relay was soldered onto the inner fuse box, so I replaced the whole thing.
Still nothing.
I took the bull by the horns and replaced the throttle body, thinking that as the P1692 specifically mentioned that, it may be at the root of the problem...
Still nothing.
So here I am, a bunch of replacements made and no further forward. The same error code is brought up through the ODBII connector and nothing I've done has made the slightest difference...
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My suggestion it to run a direct hot from battery to ur fuel pump if it start u know it in the wiring how ever could be a signal not being sent to turn it on but thats technically still in the wiring
what are you scanning car with,, ie not all code readers will read P-codes in ecu,, also the status of the alarm and anti theft within the bcm/ewls ecu's and keys,, ie its common after flat battery for these systems to loose the rolling codes between key and anti theft system,,, when does this they wont start it shuts down the fuel system and spark, to deal with this need bmw own software insta d you can by them online for around £90 uk pounds with that software can then reset the system to start off with same codes retrain the system,,, this would be my first suspect in this as its common after battery failure for this loss,, also was car jump started when battery went flat,,, if so might have spiked the ecu,,, or ecu lost some data paths,, if so worth trying a power latch reset link below
link for bmw insta d software and cable
lead that will be needed
could also use inpa as its gen 1 car ,, word of warning if did do this you would need to understand the program before trying to reset it all as could wipe the bcm
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