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Well its an 01 mack rd688s triaxle dump. sometimes make

Customer Question
Well its an 01...

Well its an 01 mack rd688s triaxle dump. sometimes make 19psi sometimes makes 24psi. no rhyme or reason.has codes with a vague definition on the launch code reader.

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

It says...FMI=5 - current below normal or open circuit...2nd one....FMI=4 - voltage below normal or shorted to low source....3rd one...FMI=8 - abnormal frequency of pulse width or period...and it says fault code not found in data base

Mechanic's Assistant: What is the make/model of your '01 car?

2001 mack rd688s triaxle dump truck with e7 350 etech

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

Boost leak test

Submitted: 2 years ago.Category: Medium and Heavy Trucks
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Answered in 10 minutes by:
12/6/2019
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
Verified

Hello and thank you for using Just Answer. My name is ***** ***** I will be assisting you with your question. I am sorry that you are having issues with your Mack, I will do everything I can to assist you. The FMI number of the fault is the failure mode identifier. There will be another number which will be a pid, psid, sid, or ppid. Do you have those numbers?

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Customer reply replied 2 years ago
Sid0250...sid0239...sid0171 but 1 occurence only ...other 2 were 15 and 13 occurences
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 2 years ago

6-3

J1708/J1587 Link

S250

142

8

Abnormal Frequency Pulse Width Or Period

5-5

Electronic Malfunction Lamp

S239

142

4

Voltage Low/Open

1-4

Ambient Air Temperature Sensor

171

128

4

Voltage Low

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Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 2 years ago

The faults listed I would go after the fault code here. That will have the diag instructions and an overview of the fault. The ambient air temp sensor aids in fuel timing and will affect the engine. Please let me know if you have any follow up questions on this. Thank you.

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Customer reply replied 2 years ago
I bought this truck pretty well molested obviously.. where on the dash is the cel or malfunction light? ill put a bulb in it. I have seen many cut wires and may very well just run new for the aat with a new pigtail.
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Mike Mcmillan
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,618
6,618 Satisfied Customers
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel

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