Toyota 1 MZ–FE Manual page 556

EG2–556
Check for open and short in harness and connector between
terminals IGT1 – of ECM and igniter (See page IN–31).
Check voltage between terminals IGT1 – 6 of ECM and body
ground.
Check and replace ECM (See page IN–36).
INSPECTION USING OSCILLOSCOPE
Reference
1MZ–FE ENGINE – CIRCUIT INSPECTION
Repair or replace harness or connector.
Remove glove compartment
(See page EG2–309).
Leave igniter connector 115 disconnected.
Measure voltage between terminals IGT1 – 6 of
ECM and body ground when engine is cranked.
Voltage: 0.5 – 1.0 v (Neither 0 v nor 5 v)
Replace igniter.
During idling, check waveform between terminal
IGT1, IGF and E1 of ECM.
HINT: The correct waveform appears as shown in the
illustration on the left, with rectangular waves.
IGT2, IGT3, IGT4, IGT5 and IGT6 signal wave–
forms are the same as the IGT1 signal waveform.