So I cant say Ive ever ran into this issue before with any of our freightliners. As of recently I have two trucks that will randomly shut down on their own. They only haul walking floor trailers and this is happening only while pumping off. Ive changed the battery shut off and the pmdb on the fire walls as those have been problems in the past. Any help is appreciated.
DD16 122SD shutting down issues
Alrighty...it looks like you have a 2017 and a 2018 122SD. Both very similar wiring for what we're interested in checking.
Can you easily reproduce this problem? Do you have access to Diagnostic Link & have you checked for any fault codes? Could also be losing 12v supply...there would definitely be codes if there is a disagreement between the PT modules.
CIRC 439A (IGN) to primarily CPC and MCM
Verify if fuse F10 is cracked in PT PDM
Verifying IGN relay in PT PDM
Look at all connections to ensure no corrosion and that they are securely fastened
(there is also a splice where this IGN signal is shared with all PT modules--not sure where that is located exactly
Also out of curiosity...what type of PTO do you have on these trucks? Is it a hotshot or something?
And to reiterate your issue...do the trucks shutdown OTR or stationary?..or right after pumping? I am super curious if there is a parameter in the CPC with a timer in it. I vaguely remember there is a setting for this if you leave your truck idling too long with no input (this is a CARB compliant setting I think). Usually when I sit i the driver seat...i just blip the throttle every once in a while and the timer resets.
You do have this parameter in the MCM because you have those "Cali stickers" on the side of your truck.
Here is the feature listed in PSL:
8.2 Clean Idle Limiting Feature
California has legislation that requires the engine manufacturer to limit the allowable engine idling time. Other states have adopted California’s Emission rules and this feature is activated on all GHG14/GHG17 DDEC13 engines.
This shutdown feature is not an engine malfunction and is required to meet the state of California emissions regulations. After an automatic shutdown, the engine may be restarted and operated normally.
The idle timer is activated only when all criteria listed in the following table are met:
NOTE: If idle is below the Clean Idle speed (900 rpm) and the Idle Shutdown is not enabled, or the engine is 30g NOx or less per hour compliant, the engine will not shut down.
Criteria for Clean Idle Timer Activation
Engine is running and engine speed in greater than 900 rpm
Coolant temperature is higher than 15.6°C (60°F)
Vehicle is not moving
Transmission is in neutral gear (or no neutral detection available)
When the timer reaches five minutes (300 sec) while Park Brake is closed, or 15 minutes (900 sec) while Park Brake is open, the engine shutdown sequence will commence. If any of the criteria are not met, the timer will not be active. The timer will reset and begin counting from zero again once all the criteria for either condition are met. The engine shutdown sequence can be overridden by the conditions detailed in one of the following sections.
For applications that have a working PTO, the shutdown can be disabled.
If Remote PTO is active (CPC4 pin 2/9 is grounded and feature is enabled), the PTO and idle timers for the Clean Idle Limiting Feature are deferred until Remote PTO is inactive and the criteria described in the previous section are met.
The timer is reset when one of the following conditions are met. To prevent tampering, permanently applying a condition will not defer the shutdown.
- Service brake pedal is actuated
- Clutch pedal is actuated
- Stop engine override is actuated
- Accelerator pedal is actuated
- Status of park brake changed
If a diagnostic tool is connected while the engine is running an additional 60 minutes idle time is granted. This session is available once per ignition cycle and will run out whenever idle or PTO conditions are met. When the idle or PTO conditions are no longer met, the diagnostic timer will be delayed.
If the tool is disconnected within this 60 minutes and either idle or PTO conditions are met, the engine will shutdown when either the diagnostic timer has run out or the regular timer for idle or PTO has reached its time to shutdown. If the diagnostic session takes longer than 60 minutes of idle time and idle or PTO conditions are met, the shutdown process will start.
Parked Regeneration (HIR) will defer the shutdown process until the completion of the high-idle regeneration.
[paste:font size="5"]Interaction With Other Features
The features listed in the following table are affected by Clean Engine Idle.
Clean Engine Idle Limiting and Other Features
Feature Interaction with Clean Engine Idle Limiting
Traditional Idle and PTO Shutdown These features can be used. The Clean logic takes the minimum of the calibrated idle and PTO shutdown times. To prevent tampering, permanent override conditions will not affect the Clean Engine Idle Limiting logic functionality.