Join Date: Sep 2019
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Failing CA Smog Test, Looking for Some Guidance
So, I'm about a month past due on my registration and have to smog my CA emissions compliant 2001 with auto trans. as required in my county biennially, via CA DMV to get my new tags. Tested it twice back in August, at two separate locations in town with the same result... truck doesn't communicate with the BAR-OIS interface via the OBD2 port, won't initialize. Checked for power at the OBD2 port with my scan tool at home and it worked fine. No check engine light... I was able to check monitors, codes, etc. without incident.
Scheduled an appointment with the Smog Ref who inspected the vehicle and failed it due to apparent tampering of the wiring to the APPS and injection pump, recommended it be put back to factory trade standards and diagnose the no-communication issue.
Took it in to have the above issues addressed, Star Cert. test & repair facility. Decent guys, fairly comfortable with their level of communication, effort, attention to detail and so on. They're diagnosis was a bad PCM. I ordered a refurb with my correct VIN and accurate mileage programmed. Verified the correct part no. given my truck is CA compliant...
After replacing the PCM, truck still wouldn't communicate with OIS. So they performed a PCM/ECM flash update and according to said shop the truck now would communicate with OIS, but it is now providing "invalid data".
Other than an old K&N CARB EO certified reusable air cleaner and intake, and a Banks Monster Exhaust with 6" dia. tip the truck is mechanically stock. She does have airbags above the rear leafs and a brake controller, likely installed by the previous owner.
Brought her home last Thursday, no check engine light, (MIL) and she runs/drives great, just won't pass smog. Checked for codes and monitor readiness and everything looks good. Took her in on Friday to have it smogged again, (different location from the shop mentioned above) so I can schedule a follow-up with the Smog Ref and get a repair cost waiver, (2 year extension) since at this point I've exceeded the cost threshold by a factor of almost 3:1.
The truck failed again, (as expected) but the technician's notes on their summary indicated that it failed because the truck wouldn't communicate with OIS... So I'm out of ideas. The aforementioned Star Cert. shop said their next suggestion would be to replace the ECM with a new factor direct part and see where that goes. Anyone have any thoughts, ideas? My next step is going to be sell the truck out of state at this rate! There's zero drive-ability issues. Thanks for your consideration!