Range Low?

Paddy_SP

Junior Member
Messages
29
Some of you may well have read about the car I bought last week from a salvage auction (with eyes wide open). I've now gone through the diagnostics in detail (there were literally hundreds of fault codes showing), and have cleared all but a few minor errors - things that won't affect running, like 'faulty humidity sensor' and 'rear right door module not calibrating'. The only engine-related issue is a secondary air sensor that's playing up, however, that should not stop it running. BUT - although it fires up every time, it still won't run for more than about a second.

What confuses me is that the fuel tank is rammed - when I tried to put some in from a can yesterday, it backed up out of the filler tube it was so full. But the fuel pump symbol is still showing on the dash - which I assume means that it thinks it's low on fuel, and there's a message saying 'Range Low'. I would therefore be most grateful if someone who runs one of these cars would be kind enough to confirm that I'm right about these two things.

If I am correct, then it would appear to be something related to the fuel pick-up or fuel pump. Unfortunately, since the engine only fires up momentarily, I can't do a live fuel pressure reading. And I've had to give the diagnostic computer back!

I also have to confess that having never seen the dash on one of these before, I don't understand the fuel gauge - I've attached a somewhat blurred photo here. The battery light goes out when it (briefly) starts, so at least that seems to be OK.

NB: Please ignore the CEL - it didn't run when I cleared that either!
 

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CatmanV2

Member
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48,789
faulty humidity sensor

Consensus view is they all do that. Not faulty but just reading. Certainly my Ghibli does.

I wonder if there is an auto stop if range is that low. Clearly the fuel level sender is working to some extent. There *may* be another sender that is 'No start, not enough fuel'

Where are you based? I wonder if live data when you try to start it might reveal something. If you're in Essex, welcome to come over and we can plug it in, otherwise *personally* I'd start with an Autel AP200 which should set you back <£70 and unlikely to not do anything you need to at this point:


C
 

Paddy_SP

Junior Member
Messages
29
Thank you for taking the time to reply and for the link - it's much appreciated! The diagnostic scanner that I borrowed was also an Autel - it was a laptop-sized device called a MaxiDAS DS808 which I may have to swipe back again for an hour or so. Methinks I'm going to have to start delving around with the fuel pumps first.

As for where I'm located - I'm hidden away in deepest, darkest mid-Devon...
 

CatmanV2

Member
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48,789
We've just been discussing this very thing - any idea where it's located?

Mentioned in the Ghibli handbook, but no more. Might be rather more complex than a straight inertial cut off as it also fires the hazards and dome lights, as well as needing the CANBUS functional.

Stupid question: Fuel pump fuses? I mean checking the fuel pressure would seem sensible but no idea if that's easy on these.

C
 

Paddy_SP

Junior Member
Messages
29
I don't think that suggesting the fuel pump fuses is at all stupid - I've just been looking at the fuse position diagram to see where they're located, so we're obviously thinking along the same lines! I'll let you know if that's what it proves to be. In the meantime, I'm still trying to satisfy myself that there's no inertia/fuel shut-off device on the M156; I haven't been able to find one listed anywhere yet, so once I'm satisfied that it doesn't exist I'll head on back out to the garage to check all the fuses.
 

CatmanV2

Member
Messages
48,789
I don't think that suggesting the fuel pump fuses is at all stupid - I've just been looking at the fuse position diagram to see where they're located, so we're obviously thinking along the same lines! I'll let you know if that's what it proves to be. In the meantime, I'm still trying to satisfy myself that there's no inertia/fuel shut-off device on the M156; I haven't been able to find one listed anywhere yet, so once I'm satisfied that it doesn't exist I'll head on back out to the garage to check all the fuses.

Oh I'm sure there is a logical fuel cut off device. I'm just not sure it's discreet

C
 

Phil H

Member
Messages
4,167
Try as I might, I can't find anything about an inertia fuel cut-off on the M156. It looks as though they were fitted up to the V's and earlier GT's, so I think C is correct and the way forward is progressive power checks.
 

Paddy_SP

Junior Member
Messages
29
It appears that instead of a simple inertia switch, there are a series of crash sensors - three down each side and two at the front. I'll try to work out exactly where they are and how they can be tested in the morning.
 

CatmanV2

Member
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48,789
It appears that instead of a simple inertia switch, there are a series of crash sensors - three down each side and two at the front. I'll try to work out exactly where they are and how they can be tested in the morning.

I don't *think* this is going to be your issue. If they are sensors, they are not likely to be a one shot and done deal, or there would be a stored code...

Just my thoughts

C
 

Paddy_SP

Junior Member
Messages
29
Yes, I agree. I've just spent the last hour transcribing all the fault codes I scribbled down yesterday so that I have a properly documented record of them. It would appear that the live ones were:
Driver’s Door: B1DD0-15 Mirror Heater Control Circuit short to battery or open
R/R Door: B224F-54 Door Module Internal Missing Calibration
P1009-00 Humidity Sensor Module error
I also have listed an 'ITM Intrusion' error, but I was unable to get much more information than that

One of the historic codes I cleared was: 'P0087-00 Fuel Rail Pressure Too Low – Bank 1'. Since the CEL is back on and the fuel system is the main suspect, it may well be this returning - I haven't had a chance to check yet, but I suspect that this is where I need to be looking. I haven't worked out yet which bank is which though - any idea?

I also bought a new battery today (although it's still on charge so I haven't fitted it yet) and replaced the key fob batteries as the dash was complaining about them.

Oh well, tomorrow's another day...
 

Paddy_SP

Junior Member
Messages
29
From what I can see online, Bank 1 is the right hand side, looking forward from the driver's seat. As they say, every day is a school day!

As for the ITM error - yes, I agree!
 

Paddy_SP

Junior Member
Messages
29
Well - I appear to have found the main 'fault' - that is, the no proper start... I removed the rear seats to get at the fuel pumps, made up a tool to undo the locking ring, and removed the pump - only to find the tank completely empty. When the car was delivered on the back of a transporter, the driver said the tank was full and that he couldn't get any more to go in. When I couldn't get any sense out of the car, I tried putting some in myself, but only succeeded in having the overflow pour petrol around my feet, so thought he was right. But he wasn't... It was only by intubating the fuel nozzle as though it were a medical patient that I managed to get a gallon to go in. Whether there was a blockage, I don't know. Anyway - it now fires up and runs, which is a massive relief! Two jobs now - a) fill up several cans (the nearest station is 11 miles away) and b) have a look at the secondary air issue.
 

Paddy_SP

Junior Member
Messages
29
Thank you! I've just spent the evening re-fitting the rear seats - in and out, in and out, until I got the right combination of seat belts, wiring harnesses, etc. poking through in all the right places. If it proves OK on a test drive in the morning, I might even take it on to the local car enthusiast meeting (Re:Fuel) at the Steamer Cafe, Cullompton. Stopping at the fuel station on the way, of course!
 

CatmanV2

Member
Messages
48,789
Fabulous. I wonder if the anti syphon device has deployed. Having said that, there is a specific funnel in the tool kit. You can't just pour it in like the old days I believe.

Also, why's the fuel gauge reading full? Stuck float perhaps?

Secondary air shouldn't affect drivability.

C