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I have a 2008 International Prostar. It has ISX435, the last…

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I have a 2008 International...
I have a 2008 International Prostar. It has ISX435, the last 8 of the vin 8C657115.The code it is throwing is SPN1174 which says it's the engine turbo #1 inlet pressure.Also has a code ECM power output supply voltage #1.The orange check engine light comes on when going down hill. It goes off going up hill.Where do you think I should start?
Submitted: 3 months ago.Category: Medium and Heavy Trucks
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Answered in 17 minutes by:
3/19/2018
Technician: Andy, Truck Diagnostic Technician replied 3 months ago
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1,964
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 Andy.

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Technician: Andy, Truck Diagnostic Technician replied 3 months ago

I would check on both codes. Do you have a headlight u can use as a load light? Disconnect the 4 pin connector at the ecm and load test the wiring there to make sure the wiring can carry current. Use both beams of the headlamp if possible.

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Technician: Andy, Truck Diagnostic Technician replied 3 months ago

Red wires are positive and white wires are negative at that connector.

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Customer reply replied 3 months ago
can we ohm it?
Technician: Andy, Truck Diagnostic Technician replied 3 months ago

Checking continuity does not check the current carrying capability of the wiring. There could be one little copper strand still hanging on left in the wiring somewhere and it will ohm out as ok.

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Technician: Andy, Truck Diagnostic Technician replied 3 months ago

The ECM grabs its power straight from the batteries. There is a small power feed harness right on top of the batteries and it has a small inline fuse holder with a fuse in it. You might also want to check there for loose connections or at any connector along that harness.

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Customer reply replied 3 months ago
anything on the turbo inlet pressure code?We are pulling it in the shop to track down the ecm issue in the morning, with your headlight procedure.
Technician: Andy, Truck Diagnostic Technician replied 3 months ago

I would inspect the intake manifold pressure sensor located in the intake manifold. It may be plugged up with soot.

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Customer reply replied 3 months ago
Okay, ready to test ecm voltage with light. What am I looking for?
Customer reply replied 3 months ago
had high and low beam on and was lit real strong...
Customer reply replied 3 months ago
also checked the resistor on the hot lead, all was good???
Customer reply replied 3 months ago
cleaned turbo inlet pressure sensor and hoping the for best so far.
Customer reply replied 3 months ago
still coding for turbo inlet pressure at idle. Have not driven it yet.
Technician: Andy, Truck Diagnostic Technician replied 3 months ago

Ok thanks for the info an sorry for the delay ! Had a family issue to deal with .

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Technician: Andy, Truck Diagnostic Technician replied 3 months ago

Would you like the troubleshooting steps for this fault?

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Technician: Andy, Truck Diagnostic Technician replied 3 months ago

Hi there. I see you viewed my last post 2 minutes later. Do you still require assistance with this?

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Technician: Andy, Truck Diagnostic Technician replied 3 months ago
Please do not forget to rate my service to you . I receive nothing for my time and efforts on here until you do so . If you need anything else, let me know ! Thanks.
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