How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Daniel Wilson Your Own Question
Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 4679
Experience:  Owner at DJ Wilson
65405794
Type Your Medium and Heavy Trucks Question Here...
Daniel Wilson is online now
A new question is answered every 9 seconds

I have a 2004 Mack vision cx613 with low power and a fault

Customer Question

I have a 2004 Mack vision cx613 with low power and a fault of spn85 fmi 4. Checked wire for rubs at module on passenger kick panel. I am having trouble finding the right schematic of the wires. My schematic says vj2 10 and vj2 11. Which are not the wires at my sensor
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Jeremy replied 1 year ago.

My name is ***** ***** I will assist you.

Can I get the VIN number so I can sign into Mack and pull the schematics? Which sensor are you having issues with?

__________________________________________________________________________________________________________________________
You want a 5 star service and I want to provide a 5 star service. Please consider that I don't know your skill level as well as I can't see,
touch, smell, hear the vehicle/machine in question. Please provide as much detail as possible and I will provide as much back.

Once an answer is provided, you should see a rating screen. Please rate my personal service to you. The ratings are my personal feedback,
they are not the site feedback.

Thank you for allowing me to assist you through Just Answer!

Jeremy

Customer: replied 1 year ago.
017701 is last six of vin it's a Mack cx613. That fault is for a speed sensor. If that was a serious question I'm worried already.not to be cruel or judgemental of someone trying to help me.
Customer: replied 1 year ago.
The spn and fmi codes are the same for all manufacturers. It's road speed voltage less than normal
Expert:  Jeremy replied 1 year ago.

You're incorrect. The SPN and FMI codes are NOT the same for all manufacturers.

You also didn;t provide the info I needed. I asked for the VIN and you only gave me a partial.

On another note, you wrote your question vague and even though you are doing the speed sensor for the code, you could also be working on one of the AS sensors for the code is in relation to them as well. That is how a Mack truck works. Next time please know your info before casting judgment on someone.

i also see that you closed this question so I will opt out and not assist. Have a good night and Merry Christmas.

Expert:  Daniel Wilson replied 1 year ago.

Hi my name is***** scan tool are you using to get your fault code? I worked for a Mack/Peterbilt/Volvo dealer and you should have MID128 or 144 then an SID or PID number, then the FMI number. I looked through the 82 pages of Mack fault codes and it is not like Cat, Cummins , and Detroit. Mack and Volvo do their own thing and are the only ones that you can match the fault codes with. Let me know

Expert:  Daniel Wilson replied 1 year ago.

Road speed is a MID144 SID84 then whatever FMI. Here is the info right from the Mack book

MID 144-PID 84

MID 144-PID 84

MID 144 PID 84 — ROAD SPEED

Failure Mode Identifier (FMI):

2 (Data Erratic), 14 (Special Instructions)

Parameter Identification (PID):

P84

Message Identification (MID):

144

Circuit Description:

The Vehicle Speed Sensor (VSS) is an inductive sensor. When the vehicle is moving, the transmission output shaft speedometer gear teeth rotate past the VSS tip and a pulsed signal voltage is generated. The Vehicle Electronic Control Unit (VECU) monitors the frequency of the signal generated by the VSS, to calculate the road speed. The air gap between the sensor and the toothed gear influences the VSS signal output and should be checked if erratic or inaccurate speedometer readings are reported.

Location:

The Vehicle Speed Sensor (VSS) is located in the rear of transmission, near the output shaft.

FMI 2

Data Erratic, Intermittent or Incorrect

Conditions for fault code:

Intermittent faulty data

Speed signal from speedometer and ABS differs too much

Speed signal from tachometer and ABS differs too much

Possible causes:

ABS Harness

ABS Sensor

Tachometer

Tachometer harness

Reaction from Vehicle Electronic Control Unit (VECU):

N/A

Noticeable external symptoms:

N/A

FMI 14

Special Instructions

Conditions for fault code:

Intermittent faulty data

Speed signal from tachometer was updated incorrectly

Possible causes:

Faulty information from tachometer

J1939 dataline link

Tachometer harness

Reaction from Vehicle Electronic Control Unit (VECU):

N/A

Noticeable external symptoms:

N/A

Expert:  Daniel Wilson replied 1 year ago.

Hi, did you get this resolved?