September 30: LEMON manuals is back up on a temporary server! Slowness is possible

Code Enable Criteria

Engine running at least 140 seconds.
Engine speed 1200-3410 RPM.
ECT more than 149°F (65°C).
TP angle 10-40 percent.
No CKP, ECT, EVAP, fuel injector, knock, MAP, misfire, O2S1, PCM internal fault, TP or P0502 DTCs are set.

DTC sets when O2S1 voltage is not consistently fluctuating outside 300-600 millivolt for more than 5 seconds.