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Old 01-23-2020, 11:28 PM   #31
jdgrand
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Default Re: No Power to Instrument Cluster

Results:
Wire from pin 10 to the fuel level sensor (Fuel level sensor signal) has the short to ground.

Since the van is parked in the driveway I am waiting for the rain to ease up before crawling underneath to check further -- flood watch for our area with 2" of rain possible from this morning to tomorrow.

Jim
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Old 01-24-2020, 02:52 AM   #32
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Default Re: No Power to Instrument Cluster

Likely finding a path through the fuel pump motor ground. If you can get the connector unplugged and the short goes away than you know it's in the pump/sender side.
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Old 01-24-2020, 08:52 PM   #33
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Default Re: No Power to Instrument Cluster

Remember that the fuel gauge *is* a variable resistor, so a full tank would test as an almost "short to ground":

142FuelGaugeChart.jpg

--dick (image from http://diysprinter.co.uk/reference/T1N_service_scans/ )
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Old 01-24-2020, 11:28 PM   #34
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Default Re: No Power to Instrument Cluster

Yes if you are measuring across pin 10 and 1, through the resistor, but if he is testing for shorts to ground, pos multimeter lead on pin 10 (unplugged), neg lead to chassis ground, there should not be continuity. If the short to ground goes away after disconnecting the plug, that means everything upstream on the van is not where the fault is, the short would be isolated to the pump/sender. It would be preferable if the short remains after disconnecting the pump/sender connector, which points to a cheaper, easier solution.
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Old 01-25-2020, 03:30 AM   #35
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Default Re: No Power to Instrument Cluster

I realized he might have been measuring with the connector removed from the IC, but i wasn't sure (some folks probe "in-circuit"), so i thought i'd cover the "could be OK" base.

But (now re-looking at the wiring diagram (page 8W-30-3)) since pin 10 on the ECM is a + supply, and pin 1 is the return, dragging pin 10 down (externally) would certainly confuse the instrument cluster.

Without looking at the reference, i was assuming () that pin 1 was a ground (it's brown!) and pin 10 was basically measuring the current it was supplying to the sensor. The training document doesn't clear that up at all.

--dick
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Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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Old 01-25-2020, 02:22 PM   #36
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Default Re: No Power to Instrument Cluster

The MB wiring diagrams are like trying to decipher pictographs drawn by a mad man! This linked example diagram is what I wish MB diagrams could be. So much easier to read and understand how all the components function and connect to each other.
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Old 01-25-2020, 03:59 PM   #37
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Default Re: No Power to Instrument Cluster

...but then you dont get to wallpaper your shop to follow all the page jumps
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Old 01-25-2020, 06:12 PM   #38
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Default Re: No Power to Instrument Cluster

Quote:
Originally Posted by koenb View Post
The MB wiring diagrams are like trying to decipher pictographs drawn by a mad man! This linked example diagram is what I wish MB diagrams could be. So much easier to read and understand how all the components function and connect to each other.
The *real* MB diagrams are of the "ladder" style (positive across the top, negative/frame on the bottom), typical for German documentation through the last 50 years. (like my old VW docs).
What we're seeing in the Dodge/Freightliner documentation have been redrawn for the US market.

I consider the US NCV3 wiring diagrams far worse (in terms of page-flipping required and other aggravations) than the US T1N diagrams. For the NCV3s i rely upon a 3rd party re-writing.

--dick
p.s. on that Piper diagram ... what's the color of the wire on the bottom? ( H2R22 )
All Most of the other wires have their color code as trailing letters after the gauge.
(for that matter, what color is "N"??)
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Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))

Last edited by autostaretx; 01-25-2020 at 06:17 PM.
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Old 01-25-2020, 09:57 PM   #39
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Default Re: No Power to Instrument Cluster

Its actually very uncommon for aircraft wiring to have any color coding. In this case, those colors are just stripes not solid colors. Typically wires are white, and only have the wiring number stamped on them for identification. Not sure what N would be, but I'd guess its a plain old white.
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Old 01-25-2020, 10:48 PM   #40
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Default Re: No Power to Instrument Cluster

Quote:
Originally Posted by autostaretx View Post
p.s. on that Piper diagram ... what's the color of the wire on the bottom? ( H2R22 )
All Most of the other wires have their color code as trailing letters after the gauge.
(for that matter, what color is "N"??)
Quote:
Originally Posted by koenb View Post
Not sure what N would be, but I'd guess its a plain old white.
For Automotive wiring in the UK the letter 'N' is used to signify BROWN.

(B = Black, U = Blue, R = Red and W = White hence the next different letter is used for Brown, omitting 'O' for clarity).

Keith.
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