DDEC III/IV Single ECM Troubleshooting – Section 52.3 Troubleshooting Flash Code 52

Section 52.3
Troubleshooting Flash Code 52

The following procedure will troubleshoot Flash Code 52. ‪

Section 52.3.1
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.
   1. If active codes other than 254/12 are logged, service them first.
   2. If active code 254/12 is logged, and no other codes are logged, hook up test ECM. If code clears, replace the ECM. If code is not cleared, contact Detroit Diesel Technical Service.

   Note: For information concerning ECM replacement, refer to section 2.9 in the service manual.