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My Dad has a 00 Mack Ch E7 it keeps derating and keeps

My Dad has a...

My Dad has a 00 Mack Ch E7 it keeps derating and keeps showing multiple codes have replaced several sensors but hasn't helped it runs fine sometimes

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

2000 Mack Ch 427

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

He has taking it bvb to 2 different Mack shops so far

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

It he says he can hit a bad bump in thr rd it will derate or make a sharp turn it will derate he has replaced several sensors already

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Customer reply replied 2 years ago
He has replaced several sensors like throttle pedal
,low coolant it shows codes that dont exist like 1-5 1-9
Answered in 3 hours by:
12/21/2019
Technician: Daniel Wilson,
 replied 2 years ago
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 14,865
Experience: Owner at DJ Wilson
Verified

Hi, My name is***** will be glad to help. We can follow up as needed on here, Give me some time to review your information and follow up with my responses. Professionals are not employees of the site but users of the site and help on here as time allows in between jobs, family, etc. Response time can vary depending on my work load each day but I will always respond back on my next available login. Feel free to respond back at anytime if for any reason we seem to get separated, for status, etc.

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Technician: Daniel Wilson,
 replied 2 years ago

This should be 9-1 Transport Protocol S254 142 14 Programming Failure

BLINK CODE 5-1 — THROTTLE POSITION (TP) SENSOR

5-1 Throttle Position Sensor 91 142 4 Voltage Low/Open 3 Voltage High

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Technician: Daniel Wilson,
 replied 2 years ago

Thoroughly inspect your wiring harness and connector pins within the circuits listed above for any corrosion or damage as well as any open circuits. Also verify your battery and charging system is all functioning within specifications as well as checking all of your cables and connections including all grounds for any corrosion or damage. If all this checks good, you very well could have a problem with the ECU itself. Verify your power in grounds to the ECU. It's a pleasure to help anyway I can.

Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 14,865
Experience: Owner at DJ Wilson
Verified
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Daniel Wilson
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Category: Medium and Heavy Trucks
Satisfied Customers: 14,865
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