crash data - cranks but won't start

lrovy

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Great thanks for the link. No doubts, airbag and restraints need to be replaced. I'll try luck though with just airbag disconnected and as soon as will receive new one, will put it in place, same as restraint.

Thanks again for all help. btw. reading about 2.7l diesel - this one has still inertia switch. In Europe majority are diesels, these days 3.0 D4 and reading through some forums, seems like these do not "behave" same way and people could start them with SRS still pushing alarm to the dashboard. But these were built for European market and given different laws and even different schemes in workshop manual for NAS - that might be the thing... obeying some laws in US, hence my earlier question about laws.

I'll post update once will identify the culprit.

Thanks again.
 

lrovy

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Thanks for everything and the links too! I'll come back with findings once I'll get it fix - hopes go it will be the suspected one.
 

lrovy

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RCM Crash Data is cleared. Though big question is if any additional routines need to be run by SDD on RCM, i.e. re-programming or something?

The enginge doesn't start still, same issue as earlier. It could be linked to the fact that airbag hasn't been replaced and seat belt buckle pre-tensioner needs to be replaced too (it fired during accident).

But really? It does block the engine from starting? I'm getting more and more suspicious that there's something else, as there's no crash signal on the bus anymore hence weird to see that engine wouldn't start.

Next suspicion is also reported by RCM and some other modules like SODL, SODR report as:
active_network_configuration `?

Literally "`?".
Whilst other modules show 6006, 6008 or something more reasonable.

Active DTCs are:
B0001-13 RCM - Driver's frontal stage 1 - deployment control
B0002-13 RCM - Driver's frontal stage 2 - deployment control

B1211-13 RCM Driver safety belt retractor pretensioner deployment control
B1212-13 RCM J_14229_DTC_B1212

B123A-15 BCM Front left turn signal
B1D64-87 HCM Left headlamp swivelling motor circuit.

At the moment, airbag is disconnected as am awaiting for replacement and confirmed that buckle pre-tensioner has fired as well, so needs to be replaced.

Any thoughts/suggestions are more than welcome.
 

lrovy

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Well... all replaced, no error codes, all nice and green - from the important ones.
Yet, it doesn't start still.

The only remaining is for the lamp, but hey, would this block engine from starting? My take is 100% no... but I could be wrong.
# only these are active
B123A-15 BCM Front left turn signal
B1D64-87 HCM Left headlamp swivelling motor circuit.

Fuel pump fuse has voltage. Checked with SDD and it shows low and high pressure, low was ~750kPa (from top of my head) and high was just shy of 20MPa.

Starter runs, but engine doesn't fire up...

Given no errors/DTCs... any ideas what it could be? Where to start next?

Ignition coils and spark plugs? Should there be an error if something is wrong there? But all of them would be bad? What else is needed? Pressure on fuel rail - seems to be based on SDD. So my take is check voltage/fuses again for ignition coils but then outside of checking physically if fuel pressure is there, what else?

It seems like next stop is at LR specialist unless you guys have some ideas? What it could be and escapes getting spotted by all the modules and electronics this car has? Hope it is nothing super $$$$
 

jlglr4

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So, you now hear the fuel pump when you turn on ignition (pre-starter motor)? The high/low fuel pressure you are reporting from SDD seems suspicious to me. Are you sure those are not just the trigger points for the codes? I don’t think fuel rail pressure at startup would be 20MPa. On my GAP tool, I can see commanded and actual fuel rail pressure. I cannot remember the actual fuel rail pressure at idle, but seems like it was around 6000kPa.

If you can confirm the fuel pump is working and rail is pressurized, then - yes, spark would next on my list. But, if you are getting no spark anywhere, I wouldn’t just be replacing plugs and coils. There would be some root cause.

Other things - make sure no airflow obstruction, make sure throttle plate/throttle body is functioning.
 

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