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I have a 2007 mack granite with a mp7 motor, abs light on no…

Customer Question
I have a 2007...

I have a 2007 mack granite with a mp7 motor, abs light on no start

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

2007 mack granite with mp7

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

Replaced cam sensor, oil pressure sensor, checked ecm connections

Submitted: 5 years ago.Category: Medium and Heavy Trucks
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Answered in 8 hours by:
10/8/2016
Technician: Jeremy, Certified Truck/Bus Technician replied 5 years ago
Jeremy
Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 4,370
Experience: ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications
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My name is ***** ***** I will assist you with your question today.

I'm an independent contractor and I don't get paid until a rating has been made.

We can go back and forth as needed to help resolve the issue you are having. Follow ups are free after ratings, so rate in confidence!

Why was the cam sensor changed?

Do you have a scan tool to read codes on the engine?

ABS will not make the truck not start. Do you get the shut down light or the electrical bolt? Is the regen light blue or another color or flashing?

_______________________________________________________________________________

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.

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Customer reply replied 5 years ago
Can sensor was changed because my mechanic suggested it. He has gone over it 9 hours to no avail. Yes the lightning bolt is lit. The oil pressure is not registering on dash, neither are the hours. We are getting oil pressure though, we put a mechanical gauge in place of the oil pressure sensor and it was reading 50 psi with just Turing the truck over. The truck will fire off ether when spraying, but quits when you stop spraying. My mechanics scan tool is unreliable for the Mack trucks.Also cleaned all battery connections today.
Technician: Jeremy, Certified Truck/Bus Technician replied 5 years ago

If you are not getting the hours display, you are not getting communication between the VECU and the ECU on the truck. This can be due to no power to the ECM or anotherr issue in the harness.

At this point, I would highly suggest getting someone with the PTT program to look at the engine and see why there is no communication or you are seriously just throwing money away.

The lack of the hours on the display screams out to me there is no communication between the modules and the question is why. Is the EVECU not powering up and sending the signal that hte ECM needs to run for the ignition is on or is the ECM not powering properly? The lightning bolt indicates there is a fault, but with the truck not running, you should have the shut down light on indicating the ECM is powered. Without that, you have no indication that the ECM is powering properly.

i know the frustration. I've been in that boat working on a fleet of MRU garbage trucks with the same engine and had fought for hours and hours without PTT and finally broke down to get it. It saves a ton of time on these.

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Customer reply replied 5 years ago
I've heard some of these have a separate power wire to power the ecm?
Technician: Jeremy, Certified Truck/Bus Technician replied 5 years ago

Yes, some of them do. The MRUs use a power wire to the battery wit ha 10 AMP fuse. The Granites which is usually the Ch or the CX bodies don't always use them. It wouldn't hurt to look.

PINS 57 and 60 are what feed the EMS aka ECM. CLICK HERE for the power diagram sheet for the ECM.

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Customer reply replied 5 years ago
where can I purchase one of those ptt scanners
Technician: Jeremy, Certified Truck/Bus Technician replied 5 years ago

Volvo or look online for them. There are several places that have them with the software and cloned scanners. It just depends on how much you want to spend and if you want authentic scanners or clones.

Alibaba has clones.

Volvo/Mack has them CLICK HERE and they are pricey. A lot of single truck operators (non-mechanics) get the cracks and then order the Nexiq adapters for them. Just browse for Volvo PTT Scanner or Volvoe PTT cracks and you can locate them.

I got mine from my dealer which give me programming access. If you don;t need programming, then you really don't need to get from them.

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Customer reply replied 5 years ago
I can test those pins in the harness to determine if it has power?
Customer reply replied 5 years ago
Also if I am testing for power in the harness, how do determine which one is 57/60
Technician: Jeremy, Certified Truck/Bus Technician replied 5 years ago

CLICK HERE for the pins. It is setup just as you look at the EMS. Top is the to plug, bottom is the bottom plug.

My power is fluctuating as they restore power from the hurricane so my responses are slow.

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Customer reply replied 5 years ago
There is two plugs on the ecm correct? Which one is it.
Customer reply replied 5 years ago
I confirmed I have power to ecm via 57/60 pins in harness. What next.
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Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
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