Cars · Electronics
OBD0 Ignition Formula
Ignition timing conversion formula for OBD0 Honda ECUs.
Adapted from pgmfi.org wiki
In OBD0 Honda ECUs, the raw byte value stored in the ROM is converted to ignition advance degrees using the following formula:
Ignition Advance (Degrees) = (Decimal_Value - 15) * 0.36
Where:
Decimal_Valueis the base-10 value of the byte located at the ignition map offset (often referred to as the value at the address).
Credits and source
Authors Anonymous PGMFI contributor
Source Adapted from OBD0 Ignition on pgmfi.org wiki. Licensed under CC BY-NC-SA 1.0.