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I have a 2012 Freightliner M2 that has issues with both

I have a 2012...

I have a 2012 Freightliner M2 that has issues with both inlet and outlet SCR temperature sensors. Where are they located?

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

Freightliner/M2/2012/Cummins ISB 6.7

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

Yes. I have hooked the cummins insite and showed the above issues

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

The active faults have caused engine derate

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Answered in 1 hour by:
8/15/2019
Technician: roybelding, Shop Foreman Freightliner trucks replied 3 years ago
roybelding
roybelding, Shop Foreman Freightliner trucks
Category: Medium and Heavy Trucks
Satisfied Customers: 12,915
Experience: Shop Froeman for Freightliner Trucks
Verified

Hello, my name is ***** ***** sorry to see you are having issues. Give me a couple of minutes to review your issue and I will assist you

Roy

Good morning

What are the codes that have set?

What is the engine serial number?

Roy

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Customer reply replied 3 years ago
Good morning. The codes are 3712, 3142, 3146, 3714Engine sn is 73185322
Technician: roybelding, Shop Foreman Freightliner trucks replied 3 years ago

Thank you. Let me check.

Roy

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Customer reply replied 3 years ago
Ignore 3317 since it cleared after reconnecting DPF temp sensor
Technician: roybelding, Shop Foreman Freightliner trucks replied 3 years ago

3146

The SCR outlet temperature sensor shares return wires in the engine harness with other sensors. A shorted return can cause multiple fault codes to be active.

Possible causes of this fault code include:

  • Open return circuit in the harness, connectors, or sensor

Open signal circuit or shorted to a voltage source

Malfunctioning aftertreatment SCR catalyst temperature sensor interface module.

Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.

For intermittent power supply and datalink communication issues with Aftertreatment Components, it is highly recommended that the OEM Power Distribution Center fuses and relays be thoroughly checked for loose, missing or intermittent connections.

3142

The SCR intake temperature sensor shares return wires in the engine harness with other sensors. An open return can cause multiple fault codes to be active.

Possible causes of this fault code include:

  • Open return circuit in the harness, connectors, or sensor

Open signal circuit or shorted to a voltage source

Malfunctioning aftertreatment SCR catalyst temperature sensor interface module.

Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.

For intermittent power supply and datalink communication issues with Aftertreatment Components, it is highly recommended that the OEM Power Distribution Center fuses and relays be thoroughly checked for loose, missing or intermittent connections.

OK, the 12 and 14 are information codes only.

You have codes for the inlet and outlet temperature sensors but from the looks of it, you have a wire harness issue, not sensor issues. Both codes indicate open or shorted wiring in the harness.

If you have Insite, double click on the codes and it will take you to the troubleshooting area. It will give you the location of the sensor as well as the wiring diagram.

Verify you have 5 volts at the sensor with the key on. You are looking for 5 volts.

They are on the SCr/DOC before and after the DPF.

Roy

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Customer reply replied 3 years ago
Ok. Doing that in a bit
Technician: roybelding, Shop Foreman Freightliner trucks replied 3 years ago

OK, I will be going to work and will be checking my email at breaks. I will be on full time around 3 PM EST.

Roy

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Customer reply replied 3 years ago
Ok
Technician: roybelding, Shop Foreman Freightliner trucks replied 3 years ago

Keep me updated.

Roy

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Customer reply replied 3 years ago
Sure
Customer reply replied 3 years ago
All other codes out besides 3712 and 3714
Technician: roybelding, Shop Foreman Freightliner trucks replied 3 years ago

They are information codes.

Did you run a regen? That is the verification of your repair. If it is a successful repair and the regen completes, they will go inactive. Otherwise, you still have issues.

Roy

roybelding
roybelding, Shop Foreman Freightliner trucks
Category: Medium and Heavy Trucks
Satisfied Customers: 12,915
Experience: Shop Froeman for Freightliner Trucks
Verified
roybelding and 87 other Medium and Heavy Trucks Specialists are ready to help you
Ask your own question now
Customer reply replied 3 years ago
I did run regen
Can I run it again?Everything is out now!!
Technician: roybelding, Shop Foreman Freightliner trucks replied 3 years ago

If it is clear, you are good.

Roy

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Customer reply replied 3 years ago
All clear
Thank you very much
Technician: roybelding, Shop Foreman Freightliner trucks replied 3 years ago

You are welcome.

Roy

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Category: Medium and Heavy Trucks
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