Hondata Kpro ECU for K20a engine and vtec is not working

Hello, maybe somebody ever had the same problem and can help with advise.

I have k20a2 engine swap in CRX Honda race car,

the problem is that the vtec is not working, ECU is not giving out 12V.

wirings from ECU to solenoid are good, oil pressure are good (i don't think Hondata need this info for vtec) ECU sees RPM, MAP sensor is working correct.

What is main input for ECU to activate Vtec solenoid? In settings i have no speed sensor- constant speed signal. Multiplexer disabled. All other sensors works properly.

Only one code is P0341 This error is generated if the phase difference between the intake and exhaust cams is more than about 5 degrees.

Some after market camshafts will generate this error, and there is after market camshafts. But this could affect only iVtech system and this code is disabled.

I had already plenty cars with the same setup, and same K-pro settings without any issues.

wiring circuits says B15 is output (GRN-YEL) and there should be 0 V during idle. (checked with multimeter, and also in data log that there is no voltage changes during VTEC window)

Maybe some grounding could be reason, i didn't done wiring for this car by my self.

Hope to hear some help, before starting to change all wiring for this car.

I think I remember the OEM ECU checks the oil pressure (perhaps there is an oil pressure switch), before it enables vtec. Have you checked the trouble-shooting in the factory workshop manual, it should give you a procedure to test, and tell you what to expect.

I believe the wrong oil viscosity can also cause problems?

I would say that this is some electric problem, Vtec oil pressure switch could be disabled ( FOR JDM engines there isn't this switch).

In factory workshop manual procedure is more useful for stock car for me it didn't help. I checked all resistances solenoids are good.

I think there is some input (combination) or only one input to ECU that gives signal +12V out to solenoid that switch on vtec. (searching how to get this)

Oh, you may need to check which way the wiring is - I seem to remember something about some Honda engines being one way round, and some the other. If it's "expecting"one and gets the other it may not move.

While a solinoid acting on a simple, un-magnitised core will normally pull/push in the same direction, regardless of witing polarity, if the core is, or has been, magnetised it will move in different directions, depending on the field orientation.