NOTE: High load operation in high ambient temperatures. No action is necessary; this is a “silent” fault where the fan will be turned on. This fault is a concern only if the fan-on times are excessive but coolant temperatures are in the normal operating range.

PROBABLE CAUSES:
1. If 110-0 is active, repair this first.
2. Check for EGR exhaust leaks at the EGR valve actuator.
3. Remove the actuator cooler lines and fittings, check for kinks/plugs or leaks.
4. EGR valve actuator failure.