Toyota Celica 2005 Repair Manual page 659

DI−460
Reference: Inspection by using oscilloscope
With the engine idling, check the waveform between terminals #10 to #40 and E01 of the ECM connectors.
HINT:
The correct waveform is as shown in the illustration.
Injector Signal Waveform
20V
/Division
GND
100 msec./Division (Idling)
MONITOR DESCRIPTION
The ECM illuminates the MIL (2 trip detection logic) if:
The ECM will illuminate the MIL when the percentage of misfire exceeds the specified limit per 1,000 engine
revolutions. One occurrence of excessive misfire during engine start will illuminate the MIL. Four occur-
rences are required to illuminate the MIL 1,000 revolutions after engine start.
The ECM blinks the MIL (the MIL blinks immediately) if:
Within 200 engine revolutions at a high rpm, the threshold for "percentage of misfire causing catalyst
S
damage" is reached 1 time.
Within 200 engine revolutions at a normal rpm, the threshold for "percentage of misfire causing catalyst
S
damage" is reached 3 time.
2005 CELICA (RM1131U)
DIAGNOSTICS
Camshaft position sensor
Crankshaft position sensor
(36−2 teeth)
− ENGINE (2ZZ−GE)
(Magnification)
20V
/Division
GND
1 msec./Division (Idling)
Injection duration
658
A21261
A21569