FI6514
Ox Signal Waveform
200 mesec./Division
1 V
0 V
A02542
200 mesec./Division
1 V
0 V
--
DIAGNOSTICS
ENGINE (2RZ--FE, 3RZ--FE)
DI--123
Refernce INSPECTION USING OSCILLOSCOPE
S
With the engine racing (4,000 rpm) measure waveform
between terminals OX1 and E1 of engine ECU.
HINT:
The correct wavefrom is as shown oscillating between approx.
0.1 V and 0.9 V.
If the oxygen sensor has deteriorated, the amplitude of the volt-
age will be reduced as shown on the left.
OK
Perform confirmation driving pattern.
NG
3 Check for open and short in harness and connector between engine ECU and
heated oxygen sensor
OK
Replace or replace harness or connector.
NG
Replace heated oxygen sensor.
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Pages From Supplement
3RZ-F,3RZ-FE