Originally Posted by sr20jet 
The last Sentra I had was sr20 swapped in. Previous owner hacked the harness, leaving me with a air intake temp sensor code (missing from harness), and rear o2 code. With the downstep harness, I was able to use a OBD1 ecu, which don't have AIT and rear o2 codes. This took care of the issues I had passing inspection.
The rear o2 issue I had was due to the car being a 1.6, the rear o2 sensor is on the engine harness as opposed to 2.0 Sentra which is inside under driver seat (My interior harness was the GA harness).
I can't speak for the rest of the States, but in the places I've talked to in GA and tried to pass it's all failed because the OBDI ecu just will not talk in ODBII talk. The CEL will not flash when asked too, it will not report all the asked for data, and so forth. Hell, I make adapter harnesses and I know for a fact that the 5 wires that go from the OBDII ECU to the OBD connection cannot be made because the OBDI ecu does not have those outputs.
But if you've got a place that's passing you then that's freakin rockstar. I wish I could find a place down here that I could bribe too pass me so I could register my car in the county I live in.
Originally Posted by PrettyDoes this step down harness cut the CEL and still allow the OBDII to pass with the plug in test?
A properly made harness will not throw a CEL, and additionally you will get a CEL when you are suppose too (i.e.: when something goes wrong with the car). To add, a correctly made harness should be fully interactive with the Concult port. HOWEVER, just because you have no CEL does not mean you will pass emissions. OBDII inspections require the ECU to talk to the test computer. OBDI ecus do not speak this lingo, nor do they have the ability too.
Be the first to like this post.
Back to top
