Monitor Description

Fig 1: Communication Diagram Between Camshaft/Crankshaft Position Sensor And ECM

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The ECM illuminates the MIL as follows (2 trip detection logic is used and DTC is stored after 2 trip detection):

• The misfiring rate exceeds a threshold value and could cause emissions to deteriorate.
• During the first 1,000 crankshaft revolutions after engine starts, an excessive misfire rate (approximately 20 to 50 misfires per 1, 000 crankshaft revolutions) occurs once.
• An excessive misfire rate (approximately 20 to 60 times misfire per 1,000 crankshaft revolutions) occurs 4 times.

The ECM begins flashing the MIL as follows (2 trip detection logic is used and DTC is stored after 2 trip detection):

• Within 200 crankshaft revolutions at a high rpm, the threshold for "percent of misfires causing catalyst damage" is reached once.
• Within 200 crankshaft revolutions at a normal rpm, the threshold for "percent of misfires causing catalyst damage" is reached 3 times.