146/12 - Bad Component - Detroit Diesel MBE 900 Technician Manual

PRELIMINARY
4.3.2.5 146/12 — Bad Component
Perform the following steps to resolve a Bad Component fault code:
1. If fault code s 146/12 is active, check the engine harness wiring from the 55-pin connector
to the EGR valve connector. See Figure 4-7.
Figure 4-7 EGR Valve Wiring Diagram
[a] If the resistance is less than 3
pins 11 to 3, then there is a short in the wire. Repair the short and verify repairs.
Refer to section 4.3.2.6.
[b] If the resistance is greater than 10 k for wires from pins 50 to 1, pins 42 to 2, or
pins 11 to 3, then there is a open circuit in the wire. Repair the open circuit and
verify repairs. Refer to section 4.3.2.6.
[c] If fault code s 146/12 is still active, replace EGR valve. Erase fault code memory and
verify repairs. Refer to section 4.3.2.6.
[d] If fault code s 146/12 is still active, go to step 2.
2. Contact the Detroit Diesel Customer Support Center at 313-592-5800.
All information subject to change without notice. (Rev. 5/05)
7SE940 0505 Copyright © 2005 DETROIT DIESEL CORPORATION
MBE EGR TECHNICIAN'S GUIDE
for wires from pins 50 to 1, pins 42 to 2, or
4-19