MBE 900 ENGINE 2007 OPERATOR'S GUIDE TROUBLESHOOTING In addition to operating the engine carefully and maintaining it properly, make sure to correct any malfunction promptly. Nexiq DDR or DDDL 7.0 version or later. For fault codes and their meanings, see the service/workshop manual. When the electronic engine control system detects a fault, it broadcasts a message on the datalink. The dash display will show the code "Motor Control Module (MCM) 128," indicating there is an engine fault. The tables that follow are designed to identify the causes of common problems, suggest further checks and appropriate remedies. When dealer service is necessary, it is mentioned in the table. Important:
To read the complete fault code, bring the vehicle to an authorized repair facility. Complete fault codes can be read using the NOTE: Remember to follow all cautions when troubleshooting the engine. All information subject to change without notice. (Rev. 04/08) 119 DDC-SVC-MAN-0040 0704 Copyright © 2008 DETROIT DIESEL CORPORATION Problem - The Engine Will Not Crank Cause Remedy The batteries are damaged or weak. Test the batteries. Replace them, if needed. The ignition switch is damaged. Replace the ignition switch. The battery cables are damaged and/or corroded. Replace the battery cables. The starter is damaged and/or worn. Have an authorized repair facility replace the starter.
The clutch or transmission is damaged. Bring the vehicle to an authorized repair facility for service. There is internal damage to the engine. Bring the vehicle to an authorized repair facility for service.