Hi guys. My friend has a Jdm d15b engine in a Honda crx delsol.It is throwing a cel 21 ,vtec solenoid,but i already replaced the solenoid and vtec solenoid switch,I checked oil pan and strainer and checked also the oil pump relief valve.I ran a supply from the ecu to the solenoid and still the same but the solenoid is ok coz i gave it a 12v supply from the battery and i can hear the clicks.Cleaned the soleniod filters and removed and checked the rocker shaft and oil lines.I put an oil pressure gauge and it is reading 30psi at idle ,engine warmed up and at about 2000rpm the pressure is at 90psi and it goes up at 105psi and when vtec kicks the oil pressure stays the same.BTW when the engine hits about 5500- 5800 rpm the cel comes on at code 21.
Can somebody help me please?