Community Forums

Kahoona · 04-01-2023, 02:43 PM

We have a TC33A National TropiCal from 2008 with the ISB 6.7 CM2160 Cummins. I suspect that we need to do a manual Regen for the device that burns the carbon (DPF). We have had problems with the EGR and now have symptoms of a clogged DPF. We do not have a switch for that. I have heard of people having to find a device under the dash to start it. I can't find one. Back when Freightliner would talk to you I was told we probably had a switch or shorting device behind or under the dash and I should find it in case I need it.

Has anybody found theirs? What does it look like and where was it? I would like to do a stationary regen rather than wait for the regular regen which might not work in the mountains and small roads.

**Lt Dan** · 04-01-2023, 02:57 PM

A lot of chassis don't have a manual regen switch. You can take it to a diesel mechanic and they can connect to a computer to force a regen. Depending on how much they would charge, you can buy a diagnostic computer that will do the regens as well as read and reset DTCs.
Here is just one that says it will do DPF regens.
https://www.amazon.com/ANCEL-HD3400-.../dp/B09R3L5BP2

Nildecaf · 04-01-2023, 03:48 PM

Suggest calling Freightliner at 1-800-FTL-HELP with the last 6 digits of your VIN. I remember when I took the Freightliner chassis class in Gaffney that they talked us through the procedure to do a manual Regen, but I don't remember the specifics, except that if I ever needed to do it Freightliner help could talk me through it. Think it's a free call even if your rig is not under warranty.

Kahoona · 04-01-2023, 05:05 PM

Quote:

Originally Posted by Nildecaf

Suggest calling Freightliner at 1-800-FTL-HELP with the last 6 digits of your VIN. I remember when I took the Freightliner chassis class in Gaffney that they talked us through the procedure to do a manual Regen, but I don't remember the specifics, except that if I ever needed to do it Freightliner help could talk me through it. Think it's a free call even if your rig is not under warranty.

I will try that. I remember when they would help over the phone. Maybe they will tell me.

Kahoona · 04-01-2023, 05:07 PM

Quote:

Originally Posted by Lt Dan

A lot of chassis don't have a manual regen switch. You can take it to a diesel mechanic and they can connect to a computer to force a regen. Depending on how much they would charge, you can buy a diagnostic computer that will do the regens as well as read and reset DTCs.
Here is just one that says it will do DPF regens.
https://www.amazon.com/ANCEL-HD3400-.../dp/B09R3L5BP2

Will probably have to do that. I can't seem to find what it actually costs to have a mechanic do a regen. I wonder if the mobil mechanics can do that.

gatorcq · 04-01-2023, 08:09 PM

EPA07 vehicles are equipped with an aftertreatment system. Perform a manual
regeneration as follows.
WARNING
The exhaust gas temperature could reach 1500°F (800°C), which is hot enough to
ignite or melt common materials, and to burn people.
WARNING
When the HEST lamp is on, be certain that the exhaust pipe outlet is not directed at
combustible material or toward anyone. To do so could cause damage to the vehicle
and serious personal injury to others.
1. With the parking brake applied, start the engine. Then step on the service brake and
cycle the park brake switch ( release and re apply ) Then take your foot off the service
brake.
2. Disconnect the shorting plug.
3. Wait four seconds.
4. Connect the shorting plug.
5. Engine RPM will rise, when the DPF light goes off and engine returns to idle
(approx.
45 minutes to an hour) manual regeneration is complete.
IMPORTANT: To stop a manual regeneration, turn the ignition off.
NOTE: "Regen“ will work only if the DPF light is on,
or the system determines, that a re-generation
is needed.

Kahoona · 04-03-2023, 08:40 AM

Quote:

Originally Posted by gatorcq

EPA07 vehicles are equipped with an aftertreatment system. Perform a manual
regeneration as follows.

45 minutes to an hour) manual regeneration is complete.
IMPORTANT: To stop a manual regeneration, turn the ignition off.
NOTE: "Regen“ will work only if the DPF light is on,
or the system determines, that a re-generation
is needed.

Thanks. Very concise. I will try it if I get a DPF light on today.

The hard part is finding the shorting plug. I spent four hours researching, hunting and calling Freightliner. I post here for the next one who looks for it.

It can be:
As per Freightliner. Under the dash to the left of the steering column on a steel plate next to the data port. Easy to spot because of a little wire loop on the plug top.

There is a post here that shows it in the front left corner of the floor where the big wire looms pass through the floor. It looks white.

There are two FReightliner diagrams showing it above the parking brake next to the data port, behind the parking brake. This appears to be a single with a inline connector rather an actual shorting.

I found 2 possibilities, photos attached. I have no date port

. The plug is in the spaghetti pile behind the gauges and comes from the big loom that feeds the dash. It is gray and has 2 wires going to it. The plug is on one end and has a red spot indented in the cap. Looks promising because it is in the computer to dash loom.

The second possibility is taped to a large loom behind the gauges and it is the light colored single wire with a connector. It has a double (safety?) catch as mentioned in one post and it is taped with masking tape by someone that wanted to be able to find it.

Photos attached. Yours could be in one of these. I tried both but was unable to regen because I had no DPF light. If I get a DPF light today I will pull over and try them and let you know.