[Tech] ECU Readiness Test for CA smog test

[dkbrooks@gmail.com]

I just converted back to CARB legal parts for the CA smog test (swapped ECU back to stock, changed injectors, MAP sensor to MAF, stepped the SC boost down, etc.) but I can't seem to get all the "readiness tests" to clear on the stock ECU. I have driven the car for a few hundred miles in what I thought was enough different situations to get the job done but I am clearly missing something.

I know there is a specific definition of what the ECU is looking for to clear the codes. In fact, I have seen a book at a local repair shop that contains all the 'receipies' for the drive cycles for all OBDII cars. Unfortunately the book is massively expensive and they are a little hesitant to let me Xerox the pages I need.

Anyone have any info on the specific drive cycles for the '97 Miata?

[millyowner]

Originally posted by dkbrooks@gmail.com@Sep 22 2005, 09:07 AM
I just converted back to CARB legal parts for the CA smog test (swapped ECU back to stock, changed injectors, MAP sensor to MAF, stepped the SC boost down, etc.) but I can't seem to get all the "readiness tests" to clear on the stock ECU.* I have driven the car for a few hundred miles in what I thought was enough different situations to get the job done but I am clearly missing something.

I know there is a specific definition of what the ECU is looking for to clear the codes.* In fact, I have seen a book at a local repair shop that contains all the 'receipies' for the drive cycles for all OBDII cars.* Unfortunately the book is massively expensive and they are a little hesitant to let me Xerox the pages I need.

Anyone have any info on the specific drive cycles for the '97 Miata?

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If you're talking about the ECU recalibrating fuel control and o2 sensor feedback after an ECU reset, moderate highways speeds for 5-10 minutes with a warm engine should hasten the ECU learning process.

If the readiness code still remains, your ECU may be losing it's memory between engine start cycles due to a bad fuse or something.