This guide outlines the hardware modifications required to convert an automatic P13 ECU (commonly used for H22A engines in Honda Preludes) for manual transmission operation.

Conversion Procedure#

1. Resistor Locations: Locate RP11 and RP12 on the ECU PCB.
2. Configuration:
   • Automatic ECUs: Typically feature a jumper at RP11 with RP12 left blank.
   • Manual Configuration: Move the jumper from RP11 to RP12 to configure the ECU for manual transmission logic.
3. Alternative Configurations: Some P13 variants may have resistors in both locations. If resistors exist in both RP11 and RP12, remove both and install a jumper wire at RP12 only.

Compatibility#

This conversion applies to ECUs sharing the P13 board architecture, including variants such as P11, P12, P13, P14, and P39.

Always verify your board layout and component markings against a confirmed schematic for your specific ECU part number before soldering.