DDEC TROUBLESHOOTING
53.3 TROUBLESHOOTING FLASH CODE 53
The following procedure will troubleshoot Flash Code 53.
NOTE:
Inactive code 53 should be cleared with the DDR and the unit returned to service if
ECM SW is greater than or equal to 7.00.
53.3.1
Multiple Code Check
Perform the following steps to check for multiple codes.
1. Turn vehicle ignition switch ON.
2. Plug in the diagnostic data reader (DDR).
3. Read active codes.
[a] If codes other than 253/12 or 253/2 are logged, service them first.
[b] If codes 253/12 or 253/2 are logged, and no other codes are logged, reprogram the
ECM. Refer to section 53.3.2.
53.3.2
Test for Codes
Perform the following steps to test for codes.
1. Start and run the engine.
2. Read active codes with DDR.
[a] If active code 253/2 is logged, and no other codes are logged, install a test ECM.
Refer to section 53.3.3.
NOTE:
It is recommended that a "Test" ECM be tried first to determine the need to replace the
ECM. For information concerning ECM replacement, refer to section 2.9 in the service
manual.
[b] If no codes are logged, troubleshooting is complete.
53.3.3
Verify Repairs
Perform the following steps to verify repairs.
1. Start and run the engine.
[a] If no codes are logged, troubleshooting is complete.
[b] If codes are logged, contact Detroit Diesel Technical Service.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
53-5
