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Have a code of SPN 3216 FMI 4 AFT1 intake NOx. Truck is

Customer Question
going into limp mode won't...
Have a code of SPN 3216 FMI 4 AFT1 intake NOx. Truck is going into limp mode won't change out of second gear. Shut truck off does fine for few mins and then back to not shifting
Submitted: 1 year ago.Category: Medium and Heavy Trucks
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Answered in 4 hours by:
1/6/2016
Technician: Daniel Wilson,
 replied 1 year ago
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 5,705
Experience: Owner at DJ Wilson
Verified

Hi my name is***** will be glad to help. What is the year, make, model of your truck and your engine information so i can be sure to give you the correct info?

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Customer reply replied 1 year ago
1FVACXDT9CHBJ7985 cummins engine # ***** 2012 Freightliner M2 Class
Technician: Daniel Wilson,
 replied 1 year ago

What model Cummins?

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Technician: Daniel Wilson,
 replied 1 year ago

3216

4

253

Aftertreatment 1 Intake NOx Voltage Below Normal, Or

Shorted To Low Source

This fault is an indication of either a faulty Nox sensor or harness issue. Inspect the sensor harness and if ok replace the sensor.

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Customer reply replied 1 year ago
Ok, so that will engine to go in protection mode?
Technician: Daniel Wilson,
 replied 1 year ago

Yes it will. Are those the only fault codes you have logged?

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Customer reply replied 1 year ago
that is all active codes. can you provide diagram of that system so i can identify components?
Technician: Daniel Wilson,
 replied 1 year ago
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Technician: Daniel Wilson,
 replied 1 year ago

Click on the link above

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Customer reply replied 1 year ago
Thanks, ***** ***** harness and it looks good AFT1 Diff Press is 2 kpa at WOT and 1 at idle sometimes 0
Technician: Daniel Wilson,
 replied 1 year ago

If the harness tests good then replace the Nox Sensor and run a regen and see if the fault goes away

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Customer reply replied 1 year ago
should i have a psi reading or voltage reading on this sensor? and this is located on part. filter or right after turbo?
Customer reply replied 1 year ago
Did you see my 2 new questions from earlier today?
Technician: Daniel Wilson,
 replied 1 year ago

Hi, I just logged in. I help on here as I am able in between jobs. See PDF page 175 in the link I posted. for a picture of your Nox sensors. There is inlet and outlet #1 is inlet between the turbo and DPF. If you have a pyrometer right at the turbo elbow dont confuse that with the Nox sensor. the picture will show you what you are looking for. Let me know if you need more help.

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Daniel Wilson
Daniel Wilson
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 5,705
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