Monitor Description

The ECM illuminates the MIL and stores a DTC when either one of the following conditions, which could cause emission control system performance deterioration, is detected (2 trip detection logic).

• Within the first 1000 crankshaft revolutions of the engine starting, an excessive misfiring rate (approximately 20 to 50 misfires per 1000 crankshaft revolutions) occurs once.
• An excessive misfiring rate (approximately 20 to 50 misfires per 1000 crankshaft revolutions) occurs a total of 4 times.

The ECM flashes the MIL and stores a DTC when either one of the following conditions, which could cause the three-way catalytic converter damage, is detected (2 trip detection logic).

HINT: 

If a catalyst damage misfire occurs, the monitor informs the driver by blinking the MIL (1 trip).

• In every 200 crankshaft revolutions at a high engine speed, the threshold misfiring percentage is recorded once.
• In every 200 crankshaft revolutions at a normal engine speed, the threshold misfiring percentage is recorded 3 times.