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Have a mbn c-15 and getting a high voltage code 110-03

trying to figure out which...
Have a mbn c-15 and getting a high voltage code 110-03 trying to figure out which pin off the ECM we should check and any other suggestions... also when we tie the wires together it doesn't change to 110-04 code stays at 03
JA: What's the make/model/year of your truck? Engine type?
Customer: 03 Kenworth w900b
JA: Anything else you want the truck mechanic to know before I connect you?
Customer: Think that is all
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Answered in 2 minutes by:
1/9/2017
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 9,006
Experience: I am ASE Master Truck Certified.
Verified
Thanks for asking your question. I will try and help you out.
Do you have a 4 or 2 wire sensor?
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Customer reply replied 10 months ago
2 and there is 10volts there instead of 4.5
Thanks for the information.
One side goes to pin 26 of the ecm. The other goes to any good ground. It could be grounded at pin 5 of ecm. But can go to any ground. Depends on the truck.
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Customer reply replied 10 months ago
I will check pin 26 see what voltage is coming out of the ecm
10-4. Please reply back if you need more help or have more questions. I am happy to assist.
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Customer reply replied 10 months ago
There is 21k ohms on that pin and 10volts on that wire doesn't appear to be have a short w any other wire
Thanks for the information.
There should only be about 5 volts on pin 26.
All that circuit has is a coolant level sensor that's basically a resister. A current high code is an open circuit. If you ground pin 26, the code should go to a -4 current low. If it does not. You have a faulty ecm.
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Customer reply replied 10 months ago
Ya when we tie the wires together it doesn't change stays at a -3
It may take up to 30 seconds to change. I would ground pin 26 right out of the ecm and run to ground.
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Customer reply replied 10 months ago
We just double checked pin 26 to verify that we were working w the right wire and it doesn't appear to be the right pin to that sensor
Are you checking the rear most ecm truck connector?
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Thanks for the information. It should be pin 26.
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Customer reply replied 10 months ago
Stays a -3
If shorting pin 26 does not make it a -4. I must suspect a bad ecm.
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Customer reply replied 10 months ago
I called and checked its still under warranty so I will try that
That's good news. Please reply back if you need more help or have more questions. I am happy to assist.
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 9,006
Experience: I am ASE Master Truck Certified.
Verified
Cat Man and 87 other Medium and Heavy Trucks Specialists are ready to help you
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Customer reply replied 10 months ago
We finally changed the ecm same problem still have 9.5 volts can't get it to change to a -4
Thanks for the information.
That is very strange. The only things that can cause this code is a bad sensor, harness or ecm.
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Customer reply replied 10 months ago
New sensor and new ecm...
There must be something wrong in the harness. That's all that left.
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Customer reply replied 10 months ago
We'll check it again
10-4. Let me know how you make out.
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Customer reply replied 10 months ago
Found the problem whoever did the thermostats last didn't plug they weather pack plug back in on the bottom of the housing... they tested the ecm and said it was bad too but we r good now
Thanks for the update. I'm glad you got it fixed. Good job.
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Cat Man
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 9,006
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