Snapshot Examples - Detroit Diesel MBE 900 Technician Manual

PRELIMINARY
7

SNAPSHOT EXAMPLES

The following snapshots are intended to show how to "interpret" the information recorded. Use
the examples as a guide to understand normal engine operation. Pay particular attention to EGR
temperature since it is the prime indicator of the EGR flow.
NOTE:
The EGR systems in the MBE 4000 and MBE 900 engines contain fewer components
and use simpler control logic than the other series of Detroit Diesel engines. Therefore,
using the Fault Codes should be the primary means of solving troubleshooting
problems. The following examples should not be used to determine good vs. bad
engine operation. They are meant to give the user a good understanding of how the
EGR system operates. As more information becomes available, the snapshot examples
will be expanded to aid engine diagnosis.
Each snapshot in this chapter was generated under controlled vehicle operation:
Cold Engine at Idle — Refer to section 7.1.1.
Engine Warming Up With No Load — Refer to section 7.1.2.
MBE 900 Engine at Low but Varied Loads and Speeds — Refer to Section 7.1.4.
MBE 4000 Engine at Low but Varied Loads and Speeds — Refer to Section 7.1.3.
Engine Running with No EGR Temperature Reading — Refer to section 7.2.1.
Engine Running with Above Normal EGR Temperature Readings — Refer to section 7.2.2.
All information subject to change without notice. (Rev. 5/05)
7SE940 0505 Copyright © 2005 DETROIT DIESEL CORPORATION
MBE EGR TECHNICIAN'S GUIDE
7-1