Mitsubishi Eclipse 1990 Service Manual page 550

Code No. (Heated Oxygen) Sensor Circuit
Malfunction (Bank 1 Sensor 2)
[Comment]
Background
The engine control module checks for an open circuit in the heated oxygen sensor output
line.
Check Area
Coolant temperature sensor: normal
Heated oxygen sensor signal voltage has continued to be 0.1
more after the starting sequence was completed.
Engine coolant temperature is not lower than
Engine speed is higher than 1200
Volumetric efficiency is not lower than 25%.
Intake air temperature is
Barometric pressure is 76
Monitoring Time:
Judgement Criteria
Input voltage supplied to the engine control module interface circuit is not lower than 4.5
when 5 is applied to the heated oxygen sensor output line via a resistor.
Making the air-fuel ratio 15% richer doesn't result in raising the heated oxygen sensor
output voltage beyond 0.1 V.
tne neatea oxygen sensor (rear).
(Refer to
Replace
ENGINE
AND ENGINE>
or higher
(11 psi.) or higher.
Check trouble symptomr
Check "trouble symptom.
TSB Revision
Troubleshooting
Heated oxygen sensor
Open circuit in
or lower for 3 min or
.
,
. . .
.
. .