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Section 55.3 Troubleshooting Flash Code 55
The following procedure will troubleshoot Flash Code 55.?
Section 55.3.1 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" .
Section 55.3.2 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.
Section 55.3.3 Verify Repairs
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.
Section 78.3 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" .
A hard engine knock and vibration is sometimes caused by too much fuel from injector or internal engine damage. Check your oil and smell it, to check for fuel in the oil (bad injector) or check for water in oil (internal engine damage). If every thing is good, have your technician check your engine computer and harness for defects since you have a code 55.
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I forgot to mention, did you have a cylinder cut out test done? This would pin point your bad cylinder if any? some water in the oil would be a concern. I would have engine pressure checked to verify.
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