Monitor Description

Fig 1: Identifying Circuit Description

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The ECM illuminates the MIL (2 trip detection logic) if:

• The misfiring rate exceeds a threshold value and could cause emissions deterioration.
• During the first 1,000 engine revolutions after the engine starts, an excessive misfire rate (approximately 20 to 50 misfire per 1,000 engine revolutions) occurs 1 time.
• After the first 1,000 engine revolutions after the engine starts, an excessive misfire rate (approximately 20 to 50 misfire per 1,000 engine revolutions) occurs 4 times.

The ECM blinks the MIL (MIL blinks immediately) if:

• Within 200 engine revolutions at a high RPM, the threshold for "percent of misfire causing catalyst damage" is reached 1 time.
• Within 200 engine revolutions at a normal RPM, the threshold for "percent of misfire causing catalyst damage" is reached 3 time.