RIP CM2250, 2013, 800,000km 20,000 hrs

[Hermjeji]

I’ll check the voltage if I get it to run tonight. How do I check voltage from ECM to sensors? I’m hunting down to see any shorts, but I might try to find a good automotive electrician to assist me with this, I just have a tester and multimeter from
Who knows when.

I could replace alternator run it and see, if it doesn’t go away I’ll just return alternator. But will check voltage.

Are your thoughts along mine that this is a simple electrical issue somewhere? If those temp sensors aren’t expensive I could just replace them.

[Rawze]

if ya can't figure it out, u might want to make an appt. with Mr. hags shop?

[Hermjeji]

(03-09-2021 )Rawze Wrote:  if ya can't figure it out, u might want to make an appt. with Mr. hags shop?

If only I trucked further than a tesla can drive to without a battery boost, that would be an option. Local dumps here so that's a far stretch. I did get my Inline 6 in the mail today. Could someone PM me for assistance with the next steps, "next" steps. Now I can start, soon, isolating these def problems.

Thanks in advance.

[Hermjeji]

Never mind. Success. Google is a friend sometimes. So far got it working on windows 8. Will connect to truck in coming days. Exciting times coming.

[Hermjeji]

Alright, finally got insite and hooked it up. First thing I did was injector leakdown test, and this is on a newly rebuilt motor.. It failed. Dropped 9,000 PSI in 1 minute. Next thing i'm going to do is the cylinder cut out test the way Rawze shows. I also looked at the aftertreatment history, and below is what I got. Also looked at engine use history, but it's bene rebuilt since then and I've only had it for 1,000 or so hours. Anything else I should be doing at this stage to start investigating into the health of this boy. FYI - SCR replaced 100 hours ago. Getting a code consistently for low def pressure low (FC 3574).

[Hermjeji]

Been a while since this thread was discussed, after about 3 oil changes, got the overhead set completed on the fresh rebuild. Wanted to touchback on the SCR issues. I'm not electrically inclined, but it doesn't seem that difficult to test resistances etc. with the multimeter:

- Every two weeks or so the trucks derates due to SCR Operator inducement failure. I reset the fault codes, and the codes that stay consistently on insite are:

1. Water in fuel - shorted to high source - FC 3714
2. SCR Intake Temp - Shorted to high source - FC 3142
3. SCR Outlet Temp - Shorted to high Source - FC 3146

Here's a log of the SCR Intake temps when just idling and moving back and forth in the yard (-40F consistently with some jumps to a reasonable number?) During this time the dosing state went from initializing to priming to dosing, but the data didn't change (ie. still lows and one or two peaks).



Looking at the Engine Wiring Diagram on quickserve, there is a common 14-pin connector that the water-in-fuel and the intake-outlet SCR temp sensors connect to, which then go to various points on the ECM. How do I go about checking this connector? It looks to be in OK shape from the photos below. I don't want to be paying $100 an hour for someone to be troubleshooting this. Either I get it to a point where I can confidently direct someone or learn to do it myself. Also, on quickserve see SS below, the 14 pins on the connector are all used, but looking at the photo only 6 are used (position 9-14).

[snailexpress]

1. Water in fuel - shorted to high source - FC 3714
2. SCR Intake Temp - Shorted to high source - FC 3142
3. SCR Outlet Temp - Shorted to high Source - FC 3146
Shorted to high source can be caused by three faults
#1. All three wires shorted to +5v
#2. All three sensors have ground run on same wire and wire or wires connection to the ground is lost.
#3. All the above.
Quickserve diagram is generic just to show point to point connections. Not wires.
My bet is on #2.
How ECM is old?
On diagram is ECM connector and it's not what you have in your hand.

[Hermjeji]

(06-27-2021 )snailexpress Wrote:  How ECM is old?

ECM is original - 2013.

(06-27-2021 )snailexpress Wrote:  On diagram is ECM connector and it's not what you have in your hand.

Could you explain this? The diagram showcases a 14 pin connector, that comes from the water-in-fuel sensor. That's what I traced to. This 14pin then splits off and goes to ECM connector A and B.

[snailexpress]

(06-28-2021 )Hermjeji Wrote:  

(06-27-2021 )snailexpress Wrote:  How ECM is old?

ECM is original - 2013.

(06-27-2021 )snailexpress Wrote:  On diagram is ECM connector and it's not what you have in your hand.

Could you explain this? The diagram showcases a 14 pin connector, that comes from the water-in-fuel sensor. That's what I traced to. This 14pin then splits off and goes to ECM connector A and B.

Is picture with electric diagram from Quickserve? If so the Quickserve will give you generic information about connections.
For example: ECM, OEM connector, pin 24 is connected to WATER IN FUEL SENSOR as SIGNAL.
ECM, OEM connector, pin 26 is return (ground) for WATER IN FUEL sensor.
This is where you need to start troubleshooting harness. From ECM harness plug OEM pin 24 to
sensor pin "signal" - continuity. Same pin to the ground or + 5 v pin - infinity.
ECM plug OEM pin 26 to sensor pin "return" - continuity
14 pin connector you referring for is optional. I don't have it on my Volvo. You have it but numbers of wires different. On other brand it could be 10 pin connector.
If you 100% sure the connector is right check the continuity between sensor and 14 pin plug, from 14 pin plug to ECM OEM connector pins.
All connectors must be disconnected and battery too.