Overview#

Most OBD1P13 automatic transmission ECUs feature a jumper bridge at RP11 with a blank space at RP12. By relocating the jumper from RP11 to RP12, you can convert the ECU to manual transmission operation.

Jumper Relocation Procedure#

Step 1: Locate RP11 and RP12#

• RP11 — Current jumper location (automatic transmission)
• RP12 — Target jumper location (manual transmission)

Step 2: Move the Jumper#

1. Remove the jumper bridge from RP11
2. Install it at RP12
3. Power on and verify operation

Tip

If your ECU lacks a spare jumper, a standard jumper wire can substitute for the bridge at RP12.

Transmission Control Resistors#

The following resistors control automatic transmission functions and may remain in place:

• R96
• C49
• R82

These resistors relate to automatic transmission control logic but do not prevent manual operation when RP12 is jumpered.

Dual-Resistor ECUs#

Some ECU variants (such as the JDM P13-900) include resistors at both RP11 and RP12 locations. In this case:

1. Remove both resistors entirely
2. Install a jumper wire at RP12 only

Applicable Models#

This conversion applies to all ECUs sharing the P13 platform PCB:

• P11
• P12
• P13
• P14
• P39

Important

Verify your ECU model before proceeding. Incorrect jumper placement may result in improper transmission control behavior.