EGjdm702

I have a b18c5 USDM stock wiring harness harness never messed with as far as being cut nothing it is obd2b and the motor is fully stock the ECU that i am using is p73 i was switching from pct to p73 ECU on an off...one day popping vtec my vtec did not want to pop it has not popped on for a while now...its throwing code p1259 in a ek coupe 2000... so far what i have done is change the oil , changed the whole v-tec solenoid and vtec pressure switch , i have ran the car for 1 min under 4000 rpms and then after 5500 rpms when vtec suppose to pop after a while after 5500 the code pops on p1259 i know that vtec malfunction i am super confused what is up this this if there is someone out there that could please help me with this ...i was thinking it could be oil pump or something as far as that or please someone give me good news lol..

HondaPartsHero

https://honda-tech.com/forums/hybrid-engine-swaps-18/%5Bfaq%5D-%22my-vtec-doesnt-work%22-1812135/

EGjdm702

I have tried all i can to find out what wrong with this v-tec malfunction... now that i have read this i have still not figured it out...i have so far since reading all the diagram i have jumped the vtec pressure switch kind of canceling it out and ran a switch from the battery to the green and yellow wire on the solenoid and it did not work out...i have even switched the whole solenoid again and still no vtec... cant be oil pump motor would have blown already... could it be the oil pressure switch behind the motor under the intake manifold nxt to the oil filter....this is pretty much i can think of...