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I have a 2007 volvo vnl with a cummins isx cm870 in the shop

Customer Question
right now, truck will idle...
I have a 2007 volvo vnl with a cummins isx cm870 in the shop right now, truck will idle for 10 mins then shut down, speedo cluster will turn off and no accessories will work. I turn key off and back on and truck will start again. Doesn't mater if the pto is on or engine off but key on, still turns off. Idle shut down is disabled with cummins insite.
Submitted: 1 month ago.Category: Medium and Heavy Trucks
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Answered in 30 minutes by:
10/17/2017
Technician: Andy, Truck Diagnostic Technician replied 1 month ago
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1,749
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter
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Hi there . My name is ***** ***** Do you have any faults when this occurs? What is the engine serial number please?

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Customer reply replied 1 month ago
No faults , i can get the serial number tomarrow
Technician: Andy, Truck Diagnostic Technician replied 1 month ago

sounds like the ignition is turning off by itself . Would that be correct to say ?

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Customer reply replied 1 month ago
Yea something like that
Technician: Andy, Truck Diagnostic Technician replied 1 month ago
I would start by going to ignition pin at the ECM which is pin 39 on the Chassis side connector to the ECM and back probe it with a multimeter to see what is happening while running to confirm that this is the case and voltage is dropping causing it to turn off
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Customer reply replied 1 month ago
I jumped the ignition switch and truck still turns off. Ill back probe pin 39 and see what happens.
Customer reply replied 1 month ago
I back probed pin 9 and with key on engine off i see 12.2v after couple mins i loose voltage on that pin and everything turns off
Technician: Andy, Truck Diagnostic Technician replied 1 month ago
Did u mean 39
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Customer reply replied 1 month ago
thats what i meant.
Technician: Andy, Truck Diagnostic Technician replied 1 month ago
Ok so the problem lies in the OEM harness on the truck somewhere . Perhaps try swapping ignition relays with some from other ciruits to see if the problem clears up
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Technician: Andy, Truck Diagnostic Technician replied 1 month ago
Or start it up and run it ! While running it , wiggle test the harness to see if it does on you while wiggling at a specific area . That will help narrow down where the problem may be
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Customer reply replied 1 month ago
I jumped pin 39 to constant 12v and trucks stays running but the speedo and other things still turn off after 10mins.. strange
Technician: Andy, Truck Diagnostic Technician replied 1 month ago

Whatever powers that 39 , those other circuits are powered by that same power source that is casuing the power loss

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Customer reply replied 1 month ago
Can the TAS switch have anything to do with it?
Technician: Andy, Truck Diagnostic Technician replied 1 month ago

what is a TAS

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Technician: Andy, Truck Diagnostic Technician replied 1 month ago

pin 39 gets power from a 5 amp fuse .

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Customer reply replied 1 month ago
Never mind the tas, I added a ground to relay r20 (idle management ignition) and truck stays on
Technician: Andy, Truck Diagnostic Technician replied 1 month ago

if you were to find an alternate ignition source , you could run an overlay from that point with an inline fuse holder with a 5 amp fuse in it and wire it into the existing wire at pin 39 .

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Technician: Andy, Truck Diagnostic Technician replied 1 month ago
Oh ok ... Thanks for the update . If we are done here , please do not forget to rate my service to you . Thank you
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Technician: Andy, Truck Diagnostic Technician replied 1 month ago

How are we doing on this ?

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Andy
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1,749
1,749 Satisfied Customers
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter

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