DDEC TROUBLESHOOTING
4. Read resistance between sockets W1 and Y2 on the engine harness connector.
[a] If the resistance measurement is less than or equal to 5 , refer to section 34.3.9.
[b] If the resistance measurement is greater than 5 , or open, the vehicle +5 volt line
(#416) is open. Repair open. Refer to section 34.3.11.
Figure 34-5
5-Way ECM Power Connector
34.3.9
Check for Short
Perform the following steps to check for short.
1. Remove jumper.
2. Measure resistance between pins A and C on the TBS harness connector. See Figure 34-6.
[a] If measured resistance between pins A and C is greater than 100 , or open, go
to step 3
[b] If measured resistance between pins A and C is less than 100 , the 5 volt supply
(#416) is shorted to the return line (#452). Repair the short. Refer to section 34.3.11.
3. Also measure resistance between socket C and a good ground.
[a] If measured resistance between socket C and a good ground is greater than 100 , or
open, refer to section 34.3.7.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
34-9
