ObdIIa to ObdI Conversion Harness problem

[VTec1987]

Is there anything else to consider besides bridging vtec pressure switch to vtec switch to get everything running probably.

When i was using my stock obdIIa ecu, everything works perfectly with no codes throwing at me. When i used the convserion harness and p28 ecu chipped for my motor, the engine light comes on Code 1 which is o2 sensor. First i thought it was the ecu, so i changed the obd1 ecu and still the same problem.

I also changed the 02 sensor as well, still the same problem. The only thing i can think off is the conversion harness being faulty. I even check the pin out from the conversion harness going in the p28 ecu and its correct.

Anyone has this problem before?

[VTec1987]

help guys

[ECU-MAN]

sounds like your harness is at fault

[VTec1987]

any chance it can be the ecu?

[ECU-MAN]

could be anything

all depends on how you have diagnosed the fault.

if two ecu's gave you the fault then you have a high chance its your harness.

how sure are you your reading the ecu pins correctly

[VTec1987]

could be anything

all depends on how you have diagnosed the fault.

if two ecu's gave you the fault then you have a high chance its your harness.

how sure are you your reading the ecu pins correctly


Now i am very certain that the ecu is at fault, i did some testing to the conversion harness and its working perfectly.

You know how i can test the ecu?

[Limbo]

get/borrow another one to test in its place?

[ECU-MAN]

if you post it to me I can test it for you for free