DDEC TROUBLESHOOTING
[b] If the resistance is greater than 5
, the return line (#952) is open, repair the open.
Refer to section 12.3.8.
Figure 12-2
Typical Variable Speed Governor Circuit
12.3.5
Variable Speed Governor Throttle Connector Check
Perform these steps to check the VSG throttle connectors:
1. Inspect terminals at the VSG connectors (sensor side and harness side) for bent, corroded
and unseated pins or sockets.
[a] If the VSG connector terminals are damaged, repair terminals and/or connectors.
Refer to section 12.3.8.
[b] If the VSG connector terminals are in good condition with no signs of damage,
refer to section 12.3.6.
12.3.6
Check for Short to Battery (+)
Perform these steps to check for short to battery (+).
1. Turn ignition OFF.
2. Unplug VSG connector.
3. Turn ignition ON.
4. Measure voltage between B (signal #525/#510) and battery ground. See Figure 12-3.
[a] If measured voltage is less than or equal to 0.2 volts, refer to section 12.3.7.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
12-7
