On a Civic EK4 vti, I have error 21 vtec spool.
if think the vtec works fine, I feel the vtec in the car, but after 600rpm the vtec is off and I have the error 21 vtec spool.
I try with 5000rpm, 6000rpm, and the vtec is ok only during 600rpm, but after the vtec is off.
When the ECU switches on the VTEC it has a voltage feedback circuit to check the spool valve is working. The fault is likely to be with the ECU, or one of the wiring connectors has high resistance.
Yes I know, but if I don't check VTEC oil pressure switch enabled ???
In europe, we don't have the vtec oil pressure on the engine
I tried to connect the VTS wire to VTP wire, but the same problem.
I used a P28 ECU, and OBD2a->OBD1 conversion Harness, I weld a wire between VTS et VTP A8 to C15
menfou: it is not the pressure switch or any settings. The ECU does an electrical check that the VTEC spool value is operating when it is switched on. If there is a fault, it is the ECU, the VTEC spool or a high resistance wiring connector. Easiest thing to do is to swap the ECU over, and then swap the VTEC spool assembly over if the ECU checks out.
I tried this P28 ECU in a Integra Type R with stock B18 calibration, and I have the same problem
I check with ohm-meter the connection, and I have 0ohms.
I have had the exact same issue arise after I got my p28 s300 ecu back from Hondata. I have troubleshooted all the other things possible and swapped out two other vtec solenoids.