Clearing DTCs and Setting ECM/PCM With The HDS

SOURCE:
Honda Service News May 2003

TITLE:
Clearing DTCs and Resetting the ECM/PCM With the HDS

APPLIES TO:
All Honda Vehicles with OBD II

SERVICE TIP:
NOTE: The Honda Diagnostic System (HDS) lets you clear stored DTCs or reset the ECM/PCM. Proper use of the clear and reset functions can save you time and headaches.

Clear: When you select the red DTCs icon on the far right of the DTCs screen, you clear the stored DTC from the memory of the ECM/PCM, but not the learned values. Use this button to clear all stored DTCs except those DTCs related to engine idle, fuel mixture, oxygen sensor, or misfire.

Reset: When you select ECM/PCM Reset from the Mode Menu screen, you clear everything from the memory of the ECM/PCM, including stored idle and fuel trim values. The reset function restores the ECM/PCM to its original configuration, and you should use it only if the problem is related to engine idle, fuel mixture, oxygen sensor, or misfire DTCs. After resetting, remember to do the idle learn procedure.