DDEC TROUBLESHOOTING
[b] If the resistance measurement is greater than 5
or open, the signal line (#133) or
return line (#452) is open. Repair the open. Refer to section 14.3.11.
Figure 14-7
ECM Engine Harness Connector
14.3.9
Open Line Check
Perform the following steps to check for an open line.
1. Turn ignition OFF.
2. Disconnect the engine harness connector at the ECM. Leave the jumper wire between A
and B of the Temperature Sensor Connector.
3. Measure resistance between sockets R2 (#120) and Y2 (#452) on the engine harness
connector. See Figure 14-7.
[a] If the resistance measurement is less than or equal to 5 , refer to section 14.3.10.
[b] If the resistance measurement is greater than 5
or open, the signal line (#120) or
return line (#452) is open. Repair the open. Refer to section 14.3.11.
14.3.10 Check ECM Connectors
Perform the following steps to check the ECM connectors.
1. Check terminals at the ECM engine harness connector (both ECM and harness side) for
damage: bent, corroded and unseated pins or sockets. See Figure 14-8.
[a] If terminals or connectors are damaged, repair them. Refer to section 14.3.11.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
14-11
