Ok here's the deal. I converted my car from obd0 to obd1 and used a jumper harness from Rywire. I purchased a used p28 that just showed up today(which the guy did not package with any cushioning or padding in the box and the whole deal was a 2 week nightmare).

I have a check engine light on for codes 41 (primary heated 02sensor)
and 22 (vtec pressure switch)

Voltage checks on the vtec pressure switch show 12 volts KOEO (pin D6 on ecu) and good ground on the other pin.

My Oxygen sensor shows 12 volts on one ckt (pin A25 on ecu) and 7 volts as the primary ckt (pin A6 on ecu). and 0.5 volts on pin d16 with a good ground on the other wire.

On the Rywire harness, the VTEC pressure switch and the H02S share the same ground but this ground seems to be checking good.

Do I have a bad ECU? (Oxygen sensor is brand new) Also should these codes come on as soon as I turn the key on even after disconnecting the battery or pulling the ECU fuse for 30 seconds?? Any help would be appreciated.

My thoughts are that all my voltages check good. I can't seem to clear the codes to retest unless I'm just doing something wrong.

 

I know jdm vtec solenoids dont have pressure switches and on the o2 you may need a 4 wire o2, are you running the two wire? Has the p28 been chipped if so, you may want to get a dif chip. What motor are you running?

Someone should be able to clarify on the first sentence if not, look it up should be easy to find.

 

I have a d16a6 block, d16y8 head. its been convertered to obd1 and has a stock p28. I have a 4 wire O2 sensor. I just don't understand how i'm getting 7 volts from the pcm to my 02 heater ckt. Shouldn't it be 5?