Codes; Diagnostic Troubleshooting; Shutdown-Engine Protection Fault Code = Red; Derate-Engine Protection Fault Code = Blue - Detroit Diesel MBE 900 Technician Manual

PRELIMINARY
4

CODES

This section supports the MBE Electronic Controls fault codes recorded during EGR engine
operation.
4.1

DIAGNOSTIC TROUBLESHOOTING

A Diagnostic Trouble Code (DTC) is generated when a condition exists that prevents the engine
from operating at peak efficiency. The codes can be for engine protection or performance.
4.1.1

SHUTDOWN-ENGINE PROTECTION FAULT CODE = RED

A shutdown-engine protection DTC is activated when a engine operating condition exists that can
cause immediate damage to the engine and the engine should be shut down until the condition is
corrected to prevent additional damage.
NOTE:
All shutdown-engine protection fault codes must be enabled in the DDEC Vehicle
Control Unit (DDEC-VCU) by the user. If not enabled, these codes act as derate-engine
protection fault codes.
4.1.2

DERATE-ENGINE PROTECTION FAULT CODE = BLUE

A derate-engine protection DTC is activated when a engine operating condition exists that can
cause engine damage if left unattended. The engine slowly looses power so that the operator
knows to correct the condition to prevent additional damage. However; if damage is not
imminent, the operator can override the shutdown and limp to safety to correct the problem.
4.1.3

PERFORMANCE FAULT CODES = YELLOW

A performance fault code is activated when specific conditions occur within a given amount of
time that the calibration determines is not "normal".
Example: For SID 146, DDEC Engine Control Unit (DDEC-ECU) uses the EGR temperature
sensor to monitor EGR temperature.
All information subject to change without notice. (Rev. 5/05)
7SE940 0505 Copyright © 2005 DETROIT DIESEL CORPORATION
MBE EGR TECHNICIAN'S GUIDE
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