DDEC TROUBLESHOOTING
[b] If the resistance measurement between sockets N2 and Y2, or N2 and battery
negative, is less than or equal to 10 , the signal line #132 is shorted to the return line
#452 or battery ground. Repair short. Refer to section 28.3.6.
Figure 28-3
ECM Engine Harness Connector
28.3.5
Check ECM Connectors
Perform the following steps to check the ECM connectors.
1. Check terminals at the ECM harness connector (both ECM and harness side) for damage;
bent, corroded and unseated pins or sockets, especially N2 and Y2 of the ECM connector.
[a] If terminals or connectors are not damaged, contact Detroit Diesel Technical Services
and refer to section 28.3.6.
[b] If terminals and connectors are damaged, repair them. Refer to section 28.3.6
28.3.6
Verify Repairs
Perform the following steps to verify repairs.
1. Turn ignition OFF.
2. Reconnect all connectors.
3. Turn ignition ON.
4. Clear codes.
5. Start and run the engine for eight minutes.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
28-7
