146/2 - Erratic Data - Detroit Diesel MBE 900 Technician Manual

PRELIMINARY
4.3.2.3 146/2 — Erratic Data
Perform the following steps to resolve erratic EGR data:
1. Check active codes.
[a] If fault codes s 146/2 and s 146/0 are active at the same time, refer to section 4.3.2.1.
[b] If fault code s 146/2 is the only active code, go to step 2.
2. Check the resistance between pin 42 of the 55-pin connector and pin 2 of the EGR valve
connector. See Figure 4-4.
Figure 4-4 EGR Valve Wiring Diagram
[a] If the resistance is greater than 3 , repair open circuit in wire between pin 42 of the
55-pin connector and pin 2 of the EGR valve connector. Erase fault code memory
and verify repairs. Refer to section 4.3.2.6.
[b] If the resistance is less than 3 , go to step 3.
3. Bridge pin 3 of the EGR valve connector to ground and check for active fault codes.
See Figure 4-4.
[a] If fault code s 146/2 is no longer active, repair open circuit in wire between pin 11 of
the 55-pin connector and pin 3 of the EGR valve connector. If fault code s 146/2 is
no longer active, erase fault code memory and verify repairs. Refer to section 4.3.2.6.
[b] If fault code s 146/2 is still active, go to step 4.
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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