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2009 Mack 613.....All of a sudden speedometer quit and rpm…

2009 Mack 613.....All of...

2009 Mack 613.....All of a sudden speedometer quit and rpm limited to about 1600..Replaced speed sensor at rear of trans and adjusted one full turn out...ran ohms check on sensor 164 ohms..Inspected harness for chaffing on top of trans...didnt find any issues..would like to ohm wires out now but do not have schematics

Mechanic's Assistant: What's the make/model/year of your truck? Engine type?

2009 cxu 613

Mechanic's Assistant: Anything else you want the Truck Mechanic to know before I connect you?

No codes in vecu

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Answered in 9 minutes by:
7/22/2020
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 2 years ago
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,618
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
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Hello and thank you for using Just Answer. My name is ***** ***** I’d like to try and help. Please allow me a few moments and I will get this for you. Thank you
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Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 2 years ago
The PIN numbers for the vss at the vecu are pins 6 and 20 on the blue connector the PIN numbers are marked on the back side of the connectors. Pin 6 goes to pin A on the vss. Make sure you check the connection at the cab pass thru connector as well the PIN numbers there are pins 30 and 31. I hope this helps with your issue. Thank you
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Customer reply replied 2 years ago
Is the vecu in the cab
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 2 years ago

Yes, It is behind the main switch panel right behind the abs module.

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Customer reply replied 2 years ago
Ok thank you
Customer reply replied 2 years ago
Anything else I can check besides those 2 wires
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 2 years ago
If those wires check out fine check the ac voltage out put and if you are seeing a signal then you probably have a bad vecu
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,618
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
Verified
Mike Mcmillan and 87 other Medium and Heavy Trucks Specialists are ready to help you
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Customer reply replied 2 years ago
hard to see position numbers on plug
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