QuestionJohn,
I have a 2001 Series II with 101K miles. I've had all of the regular scheduled maintenance on the vehicle and it has given me no signifiant issues (purchased as a CPO in 2003).
On the long weekend my wife was driving and the engine shut off. She managed to pull off teh road and the engine restarted but onbly idled for a 20-30 seconds. I thought the battery or alternater was at fault and replaced the battery - with the intention of taking it to my mechanic. The vehicle restarted and I let it idle for 10 minutes. I then drove it home and the engine again shut off (after 4 miles) although I was able to put it into Neutral and it restrted. I drove it home.
I took the vehicle to my mechanic (who is very good and works on imports). It's now been 2 1/2 weeks and we can't determine what the issue is. No code is sent to the EMS. The check engine light comes on when it dies but doesnt stay on when it restarts. Sometimes it restarts right away - other times it takes several hours. They think it may be the crankshaft sensor but do not want to just change parts if that's not the issue.
I have had very little success at my local dealership - no customer service and they care little about their customer's wallets.
Have you heard of this? Any assistance is very appreciated.
AnswerHi Randy,
its quite possible that the crankshaft sensor (CKP). So much so that LR even describes the faults:
In the event of a CKP (crankshaft position) sensor signal failure any of the following symptoms may be observed:
1. Engine cranks but fails to start.
2. MIL remains on at all times.
3. Engine misfires (CKP sensor incorrectly fitted).
4. Engine runs roughly or even stalls (CKP sensor incorrectly fitted).
5. Tachometer fails to work.
6. Flywheel adaption reset – ferrous contamination
If the CKP sensor fails while the engine is running the engine will suddenly stall, this is because the CKP sensor has no backup strategy. If this happens the ECM will produce a fault code that it can store in its memory. If the engine is not running when the CKP sensor fails, the vehicle will crank but will be unlikely to start, and no fault code will be generated. In this instance the MIL lamp will remain illuminated and the tachometer will fail to read.
It is vital that the CKP sensor output wires are not reversed (i.e. the connector is fitted incorrectly) as this will cause a 3 advance in ignition timing. This happens because the ECM uses the falling edge of the signal waveform as its reference or timing point for each passing tooth on the reluctor.
Whenever a new crankshaft position sensor is fitted or the flywheel is removed, the adaptive values will have to be reset, using TestBook.
Should a malfunction of the component occur, the following fault codes may be evident and can be retrieved by TestBook:
P0335 Crankshaft position sensor a circuit malfunction. Reference mark outside search window for more than two revs, with engine speed above 500 rev/min
P0336 Crankshaft position sensor a circuit range/
performance. Incorrect number of teeth detected ±1 tooth between reference marks with engine speed above 500 rpm
Its a hard problem to diagnose and I wish you luck. See if the garage is willing to test install the CKP. IF it does resolve the problem all are happy and you pay the bill. IF it does not solve the problem, they put back to old one and move on to the next possible cause.
Best of luck,
JohnMc
