Member Since: 03 Aug 2020
Location: Ardgay
Posts: 23
Crank not detected on startup
Morning all,
Having just finished a shed load of work on the old shed, I went out this morning to test the new glow plugs (its -4 here) and hurrah it started perfectly... but...
I have two faults. I'm not sure if they are related but:
1) Crank not detected on startup
2) Generator field terminal voltage low
(I thought I'd screen shot them but they aren't in photos)
Crank not detected doesn't actually affect startup physically, it starts up very quickly, smoothly, hot, cold and always on 6 cylinders now. It's only occasionally, I think when battery is at its lowest.
Alternator is original, 116k, 15 years old. However before I removed body to do the work there wasn't a warning light or fault code that I ever saw on IID tool.
I also never saw the crank not detected on startup.
I have had the new cambelt off (P/O fitted just before I bought it) to remove head.
Rebuilt and and refitted LH head
Refitted cambelt (I didn't use locking tools, just marked it up, including the pulley adjustment to make sure it went back as it came off)
Fitted a new OE turbo
Blanked EGRS
And a load of other bits but not related to the engine.
Do we think this is a simple as change the old alternator and it will clear the occasional crank not detected fault? Or is there a bit of loom that has both alternator and crank sensor wires in the same part that is a common fault/trap area.
Sorry for all the questions and thanks in advance!Discovery 3 TDV6 SE Manual 2004
Discovery 3 TDV6 Manual 2005
Saab 9-5 Aero Hot Manual Estate 2006
Alfa Romeo 156 2.4 SW 2003
Classic Mini 1152cc "special" 1979
Series IIa 109TC 2.6l 6 cyl 1971
28th Feb 2021 9:36 am
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10364
Check the small alternator plug is connected.
Remove and replug in
28th Feb 2021 10:24 am
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10364
Regarding crank not detected.
I’d probably ignore it. Maybe a bad connector under the battery or in that area
28th Feb 2021 2:57 pm
haveyoubooked
Member Since: 03 Aug 2020
Location: Ardgay
Posts: 23
Evening Pete,
Thanks for the advice. I was out this afternoon with the spanners and whilst it was ticking over (I was changing some Voss connectors for some new ones from advancedfluidsolutions and testing them).
Smelt something funny (electrical smell), battery lights on, voltage on IID showed at 11.6 and dropping (new Varta in there a few weeks back). Then smoke started pouring out of alternator.
Pulled it out and its a very old Denso unit. Smells like the spark of its life has been smothered in poo.
Checked the main lead from it to the starter and there to the battery positive terminal and its not caught anywhere so I'm fairly sure it was the alternator at fault, not something the from the loom that shorted the alternator out. Come to think of it the lights have had a flicker to them at low revs after a cold start for a few minutes for the past six months...
Discovery 3 TDV6 SE Manual 2004
Discovery 3 TDV6 Manual 2005
Saab 9-5 Aero Hot Manual Estate 2006
Alfa Romeo 156 2.4 SW 2003
Classic Mini 1152cc "special" 1979
Series IIa 109TC 2.6l 6 cyl 1971
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