DDEC TROUBLESHOOTING
12.3 TROUBLESHOOTING FLASH CODE 12
The following procedure will troubleshoot Flash Code 12.
12.3.1
Multiple Code Check
Perform the following steps to check for multiple codes:
1. Turn ignition ON. (For VSG circuit, see Figure 12-1.)
2. Plug in DDR.
[a] If active code 187/3 and any other codes except 91/3 or 100/3 are logged,
refer to section 12.3.2.
[b] If active code 187/3 and codes 91/3 or 100/3 are logged, refer to section 91.2.
Figure 12-1
Variable Speed Governor Circuit
12.3.2
Sensor Check
Perform the following steps to check the sensor:
1. Turn ignition OFF.
2. Unplug the VSG throttle connector. (For VSG circuit, see Figure 12-1.)
3. Turn ignition ON.
4. Read active codes.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
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