Toyota ZZT230 series, Repair Manual

Page: 328 / 821

01-117
DIAGNOSTICS
-
ENGINE
)
Check
and replace
ECM
(See
page IN-30).
)
)
4
Check
for open and short In harness and connector in
IGT
signal circuit between
ECM and Ignition coil with Igniter (See page IN-30).
G
Repair or replace harness or connector.
5
Check
voltage between terminals
IGTI
-
4 of
ECM
connector and body ground.
IGT
IGF
5 VI
Division
PREPARATION:
Remove the ECM cover.
CHECK:
Measure voltage between terminals
IGT1
-
4
of the ECM con·
nectar and body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
Reference: INSPECTION USING OSCILLOSCOPE
During cranking or idling, check waveform between terminals
IGT1
-
4
and E
1
of the ECM connector.
HINT:
GND
Correct waveform appears as sohwn, with rectangle waves.
GND
G
Check and replace ECM (See page IN-30).