Monitor Description

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Camshaft And Crankshaft Position Sensor Communication With ECM

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.