DDEC TROUBLESHOOTING
[a] If the resistance measurement is greater than 10,000
or open, contact the
component supplier for instructions. The wiring is okay, but the device may be
defective. Refer to section 54.3.13.
[b] If the resistance measurement is less than or equal to 100 , the VSS signal line
(#556) is shorted to ground, Repair the short; refer to section 54.3.13.
Figure 54-6
ECM Vehicle Harness Connector
54.3.13 Verify Repairs
Perform the following steps to verify repairs.
1. Turn the ignition OFF.
2. Reconnect all the connectors.
3. Turn the ignition ON.
4. Clear DDR codes.
5. Perform a road test with an assistant. Ensure the vehicle is loaded.
6. Stop the engine.
7. Check DDR for codes.
[a] If no codes are logged, no further troubleshooting is required.
[b] If code 84/12 is not logged, and other codes are logged, refer to section 9.1.
[c] If code 84/12 is logged, and any other codes are logged, all system diagnostics are
complete. To troubleshoot the error, refer to section 54.3.2 and perform tasks.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
54-11
