I put the jumper wire in the box and use the blue connector (very carefully) for battery positive.
NOTE: On this distributorless ignition (DLI) system, ignition coil discharge is bipolar -- #1 and #3 plug wire terminals are negative, #2 and #4 are positive. If the inductive pick-up on your timing light has an arrow indicating polarity (which side should be facing the spark plug) and the light does not flash or only flashes intermittently when clipped on the spark plug wire, simply reverse the pick-up (clip pick-up on with arrow facing the coil rather than the spark plug). The light should now flash with each coil discharge. If not, check timing light operation on a conventional ignition system.
CAUTION: Be extremely careful when making connections to the diagnosis connector. Incorrect connections will cause component damage.
Warm engine to operating temperature.
Turn all electrical loads "OFF."
Check engine condition (spark plugs, hoses, etc.)
If using Mazda System Selector (SST #49 B019 9A0), connect to diagnosis connector. Set test switch to "SELF-TEST" position. If SST is not used, install a jumper wire between diagnosis connector "TEN" and "GND" terminals.
Connect timing light to diagnosis connector terminal IG-.
NOTE: When using an externally powered tachometer and/or timing light, connect it to the power connector (Blue: 1-pin). Do not ground power connector or 20A wiper fuse will blow.
Idle Speed Adjustment
Check idle speed. If not within specification, adjust as necessary by turning air adjusting screw.
850 ±50 rpm
Verify that timing mark (yellow) on crank pulley and timing belt cover are aligned:
If not, loosen crank angle sensor lock bolt and turn sensor to adjust.
Tighten crank angle sensor lock bolt to 19 - 25 Nm (14 - 19 ft lb).
After adjustment, disconnect SST or remove jumper wire from diagnosis connector.
Rev engine and verify that timing advances.
We all have opinions, as a professional mechanic I know it is adjustable and I will continue to check them. I have been told by the BAR that we must check them. This was before STAR. You are free to do what you feel is right, as are the rest of us.
Okay if 95% of the techs are making a mistake than we would see a lot more people get dinged for putting Not Adjustable Timing on those OBD1 miatas
I doubt you will get ding'ed for not checking timing on this platform.
The fact is, the timing is adjustable. I had a Miata come in for a NOx failure. The tech that failed the vehicle didn't check the timing. As I recall, it was off ~~ +10°. The consumer fancied himself as a street racer, and thought bumping the timing would get him more performance. As D stated, you can move the cam sensor housing on the back of the head to adjust the timing.
Why make it simple, when it will work equally as well complicated.
It will get a little more fun full advance. Had one in the shop for a month after an engine install, everytime I took it to lunch I turned it up all the way. They have trouble spinning the rollers if it's too retarded. We couldn't get the NOx down on that one for some reason even at spec. I tried to slip it past the Test Only gut once with it slightly too retarded but the tech was too honest. I was pretty bad back then at diagnostics.