Troubleshooting Flash Code 55
The following procedure will troubleshoot Flash Code 55.?
Check J1939 Data Link
Perform the following steps to check for J1939 data link fault.?
Is this a J1939 transmission/engine application?
If yes, contact Detroit Diesel Technical Service.
If no, use programming station and go to "update customer calibration" and select transmission to manual, or correct transmission. Save changes. Refer to "55.3.3 Verify Repairs" .
ECU Code Check
Perform the following steps if code 216/14, missing other ECU displays. This indicates DDEC ECM has lost its connection with other ECU devices and a lost or shorted J1939 data link. ?
If code 86/14 displays also, there is a fault with the smart cruise. Contact OEM for instructions.
If code 84/12 displays, the fault is with the programming of the ECM, or a short exists to the J1939 data link. Contact OEM for VSS (Vehicle Speed Sensor) troubleshooting.
Perform the following steps to verify repairs.?
Plug in DDR.
If active codes 216/14 or 231/12 are not logged, troubleshooting is complete.
If active codes 216/14 or 231/12 are logged, contact Detroit Diesel Technical Service. Check DDR software level. Update DDR software if current level is 1.2.
Troubleshooting Flash Code 78
For troubleshooting Flash Code 78, follow these procedures:?
For intermittent fault code 86/14, ensure ECM programming is updated to level 32.00 or higher.
If code 86/14 is logged with 216/14, for troubleshooting refer to "55 Flash Code 55 - J1939 Data Link Fault" .