DDEC TROUBLESHOOTING
[a] If the resistance measurement is less than or equal to 100 , the signal line (#530) is
shorted to the engine +5 volt line (#416). Repair the short and refer to section 35.3.8.
[b] If the resistance measurement is greater than 100 , or open, refer to section 35.3.6.
Figure 35-3
ECM Engine Harness Connector
35.3.6
Check for Short to Battery (+)
Perform the following steps to check for a short to battery (+).
1. Remove both fuses to the ECM.
2. Disconnect the vehicle harness and 5-way power connectors at the ECM. See Figure 35-4.
3. Measure resistance between socket P2 on the engine harness connector and socket B3
of the vehicle harness connector, and between P2 and the 5-way power harness sockets
A and C.
[a] If resistance measurement is greater than 100 , or open, refer to section 35.3.7.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
35-7
