Okay so I recently got this car on a trade. The car is an 88 hf crx with a 97 gsr obd2 conversion. it has a obd1 harness with an obd2 jumper. I took the jumper out and hooked up straight to the obd1 with a chipped p28 and the cel light turns on and the vtec will not engage.... But with an obd2 p72 ecu it runs fine??? I tride 3 obd diffrent p28s and they all did the same thing.... So is there something I gotta change? please help!

 

have you tested or tried another jumper harness?

 

Sorry for the misunderstanding... the car has a obd1 harness with a jumper for 0bd2 and is running on a obd2 ecu. I took the jumper out and plugged straigh to obd1 harness but the cel is on know...

 

ttt

 

have u checked what code its throwing?

 

How can I check the code?