Monitor Description

Fig 1: Camshaft And Crankshaft Position Sensor Circuit Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 times, (for the 2nd trip, reaching the threshold once will cause the MIL to flash)