TROUBLESHOOTING FLASH CODE 21
[b] If terminals and connectors are not damaged, refer to section 21.3.1, to review this
section. If review leads back here, install a test ECM or contact Detroit Diesel
ECM Vehicle Harness Connector
21.3.10 Verify Repairs
Perform the following steps to verify repairs.
1. Turn ignition OFF.
2. Reconnect all connectors.
3. Turn ignition ON.
4. Clear DDR codes.
5. Start and run the engine for one minute. Check idle position and full throttle.
6. Stop engine.
7. Check DDR for codes.
[a] If no codes are displayed, troubleshooting is complete.
[b] If code 91/3 is not logged, and other codes are logged, refer to section 9.1.
[c] If code 91/3 is logged, and other codes are logged, all system diagnostics are
complete. If a problem still exists, review this section from the first step to
troubleshoot the error, refer to section 21.3.1.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION