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We have a2007 freightliner columbia day cab tractor. all of…

We have a2007 freightliner...

We have a2007 freightliner columbia day cab tractor. all of the pressure switches on it check good. when starting up the low air pressure warning buzzer is sounding and stops when the air pressure goes above 80 psi as it should. but when we start to move forward the warning buzzer sounds continuosly as long as the truck is moving even though the air pressure is 125 psi and stays there

Mechanic's Assistant: Are any of the vents working properly?

Which vents?

Mechanic's Assistant: What's the make, model, and year of your truck?

2007 freightliner columbia day cab. I saw a post on your web site with a person with same issue on the same truck

Mechanic's Assistant: Is there anything else the truck Mechanic should know before I connect you? Rest assured that they'll be able to help you.

Not that I know of

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Answered in 8 minutes by:
6/22/2021
Technician: Wayne, Journeyman replied 1 year ago
Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 17,788
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
Verified

Hi, I'm Wayne.

I'll be assisting you with this issue today.

Thank you for coming to Just Answer

Your Question is as important to us as it is to you.

I am sorry to hear you are having this issue.

I go offline at 3 pm CST. M-F

Weekend 2 pm CST for the day.

Is this an M2 Freightliner? If yes, the issue is in the AMU(air management unit)

it is bolted on the frame rail, has 3-4 modules and many airlines going to it

a module has failed.

I hope this helps you.

Wayne

Wayne

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Customer reply replied 1 year ago
not a m2.. 2007 vin 1*****************. I have found looking at 2006 year model give info more valid for this truck.
Technician: Wayne, Journeyman replied 1 year ago

Hi,

Thank you for the response.

OK, Thank you.

Wayne

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Customer reply replied 1 year ago
with lap top connected we have found out the warning buzzer ony start when truck is moving forward at more than 1.25 mph
Technician: Wayne, Journeyman replied 1 year ago

Hi,

Thank you for that

sounds like you are getting feed back from the ECM, I would suggest having the ECM, flashed and updated.

Waye

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Customer reply replied 1 year ago
finally found that it was the 'engine idle timer pressure' sensor located at position #4 on the air pressure manifold located in cab on firewall behind radio working backwards or wrong one installed. thanks
Technician: Wayne, Journeyman replied 1 year ago

Thank you for taht.

That is a 1st for me, Thank you............

Wayne

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Customer reply replied 1 year ago
sir it was a strange one. Have a great day
Technician: Wayne, Journeyman replied 1 year ago

Morning,

Thak you, you also.

Wayne

Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 17,788
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
Verified
Wayne and 87 other Medium and Heavy Trucks Specialists are ready to help you
Ask your own question now
Customer reply replied 1 year ago
Got it fixed. No need to call or respond. Thanks
Technician: Wayne, Journeyman replied 1 year ago

thank you.........

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Wayne
Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 17,788
17,788 Satisfied Customers
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

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