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Clayton
Clayton, Mechanic
Category: Heavy Equipment
Satisfied Customers: 754
Experience:  5+ Years at Freightliner, Detroit & MBE Certified, ATD, and Electrical
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60 Series..quit working..codes on Tach as original.What..look next

Resolved Question:

FLD 120 60 Series DDEC lll
Tachometer quit working-Replaced-New one not working- Set codes on Tach as original.
What and where do I look next? Could it be a Sensor? How would I check that out?
What would the replacement Sensor # XXXXX?
Submitted: 2 years ago.
Category: Heavy Equipment
Expert:  Clayton replied 2 years ago.

Hi, Welcome to Just Answer, I am Clayton. I can help you with this.

 

What is the last 6 of the vin number?,

 

The tach is most likely driven off of the ECM, but I will look and make sure your truck is wired like this.

 

I have a wiring diagram I can look at so you can ohm out the wires from the tach to the ECM if it is wired this way.

 

 

Customer: replied 2 years ago.

Clayton:

VIN #838265 Freightliner FLD 120

Could you send wiring diagram so i can follow sequence

Thank you,

Arnie

 

Expert:  Clayton replied 2 years ago.
On the Vehicle interface harness connector,(ECM, it will be Pin location #1, this harness connector is on the left side of the ECM, if you are facing the driver side of the engine.

This is circuit D505, this goes into a 2 pin connector. This 2 pin connector will be circuit d953, and d505.

The drawing I have is very generic.

Pull the panel for the tach down, look for these 2 circuits. Ohm Circuit 953 to ground, this should be the ground. Then Ohm the tach signal wire which is Circuit D505 to Pin 1 of the ECM connector. If you have good continuity here, then there is something going on with the switches in the tach, or the ECM's tach output is bad.

Clayton, Mechanic
Category: Heavy Equipment
Satisfied Customers: 754
Experience: 5+ Years at Freightliner, Detroit & MBE Certified, ATD, and Electrical
Clayton and other Heavy Equipment Specialists are ready to help you

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