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The Hondata K–Series ECU has software selectable 9600 bps or 115200 bps output baud rates. To be compatible with the Race Technology ECU decoder, the ECU must be set to output data at 9600 baud. There are two models of this ECU in common usage, the PRA and PRB. This unit will only work with the PRB ECU.

ECU Name Race Technology message Race Technology Default name Race Technology VAR number Resolution
Engine Speed Engine RPM RPM VAR_0010 25 RPM
Coolant temp temperature 8 Water temp VAR_1007 0.1 oC
Air temp temperature 1 temperature 1 VAR_1000 0.1 oC
Battery Voltage misc 3 Battery voltage VAR_4002 0.01 V
Air Fuel Ratio misc 1 Lambda 1 VAR_4000 0.01 lambda
Throttle Position aux 1 Throttle position VAR_2000 0.1%
Manifold pressure pressure 5 Boost pressure VAR_3504 0.1 kPa
Injector Time measured time 1 Fuel inj 1 PW on VAR_2500 µs
Ignition Timing angle 2 Ignition angle VAR_3001 0.5o

There is more information about connecting to the hondata ECU here:

In particular the data output from the ECU is on Pin 24 on the E connector, this is labelled as SEFMJ

IMPORTANT: The Hondata ECU does not use standard serial data voltage levels, so the hardware of the Race technology ECU adapter must be modified to suit this adapter. A Hondata ECU adapter cannot be used with any other ECU, and visa-versa.

On the Race Technology ECU adaptor there is a 9-way d-type connector labelled ECU. You need to connect PIN2 to PIN E24 of the ECU.

If you are powering the ECU from a different power source as the ECU adaptor then you will also need to connect pin 5 from the ECU adaptor to the ECUs power supply ground.

On the Race Technology ECU adaptor there is a 9-way d-type connector labelled ECU. You need to connect :

  • PIN2 of the D type to PIN E24 of the ECU (this is the data pin from the ECU->RT)
  • PIN5 of the D type to the ECUs power supply ground
  • PIN3 of the D type can remain unconnected (this is the data pin from RT->ECU but in this application there is no reuirement for this)

Also note that for this ECU you need to configure the DASh/DL1/PC to expect 0.25 pulses per revolution to get the correct RPM displayed.

Also note that this ECU ONLY outputs data when the engine is running, when the engine is not running there is no data available

Page last modified on September 29, 2014, at 01:38 PM