TROUBLESHOOTING 126 All information subject to change without notice. (Rev. 04/08) DDC-SVC-MAN-0040 0704 Copyright © 2008 DETROIT DIESEL CORPORATION Problem—The Engine Is in Emergency Running Mode (constant speed 1,300 rpm) Cause Remedy The MCM or CPC or sensor(s), solenoids and other electronic parts are damaged. Bring the vehicle to an authorized repair facility for service. Problem—The Coolant Temperature Is Above Normal Cause Remedy The coolant level is too low. Check for coolant leaks, and repair as needed. The poly-V belt is loose. Tighten or replace the poly-V belt. The coolant temperature gauge and/or sensor is not reading correctly.
Bring the vehicle to an authorized repair facility for service. The radiator is damaged or dirty. Clean the radiator. Repair or replace the radiator as necessary. The water pump is damaged. Have an authorized repair facility replace the water pump. The thermostat is not operating properly. Have an authorized repair facility replace the thermostat. The fan is not operating properly. Bring the vehicle to an authorized repair facility and have the fan hub checked. Bring the vehicle to an authorized repair facility and have the parameter settings reprogrammed in the MCM or CPC.