Codes Rookie Question

[Seaweed]

2015 Tri, If I clear out the codes, do the real ones return? And are there intermittent ones that go away? Thanks!

[Jack Klarich]

There are three types of DTCs: current, pending and historic. The odometer self-diagnostics displays all codes and differentiates between current and historic with a letter designator.

• Odometer self-diagnostics will display both current and historic DTCs.
  
• Current DTCs reside in the memory of the ECM, BCM, instruments, radio or ABS module (if equipped) until the DTC is resolved.
  
• A historic DTC can be cleared by use of odometer self-diagnostics or after a total of 40 error free ignition cycles (start and run cycle) have elapsed.
  

Current DTCs are those which presently disrupt motorcycle operation and are set during the current ignition cycle. To determine current DTCs are present, clear the DTCs and operate the vehicle within the parameters for setting the DTC. See the appropriate diagnostic procedures for solutions.

Some DTCs require multiple occurrences or drive cycles to set. When these DTCs are first recognized, but have not repeated enough to set as a current DTC, they are reported as pending DTCs.

If a particular problem happens to resolve itself, the active status problem is dropped and it becomes a historic DTC rather than a current DTC. DTCs will also lose current status when ignition is turned off. If the problem still exists when ignition is turned on, the code will show as current.

Historic DTCs are stored for 40 ignition cycles to assist in diagnosis of intermittent faults. On the 40th error free cycle, the DTC will clear itself.

It is important to note that historic DTCs will exist whenever the system indicates existence of a current fault. See Multiple Trouble Codes. if multiple DTCs are found.

Diagnostic procedures are designed for use with current DTCs. As a result, they frequently suggest part replacement. When diagnosing a historic DTC, the procedures can be helpful but should not lead to part replacement without verification that the part is faulty.

Emissions related DTCs will illuminate the check engine lamp for three warm up cycles after the DTC has transitioned from current to historic.

[Seaweed]

Thanks Jack. Better understanding now.

[DK Custom Products]

In addition to Jack's informative post, some may find the following video useful.



Here is a LINK to DTC's