JAC J2 - Page 193

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Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
192
2.
Installati
on
position
Front (upstream) oxygen sensor is installed on the
exhaust manifold before the three-way catalyst
converter and the rear (downstream) oxygen sensor is
installed behind the three-way catalytic converter.
3.
Wiring
diagram
Pin 39: Downstream oxygen sensor grounding
Pin 29: Downstream oxygen sensor signal
Pin 4: Downstream oxygen sensor heating control
1#: To main relay power
Pin 39: Upstream oxygen sensor grounding
Pin 45: Upstream oxygen sensor signal
Pin 2: Upstream oxygen sensor heating control
1#: To main relay power
4. Diagnosis
ECU detects the oxygen sensor circuit and ECU internal power amplifier circuit and testing circuit. If
one of the following conditions occurs, the oxygen sensor fault indicator will be set:
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Battery voltage not reliable
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Intake manifold absolute pressure signal not reliable
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Engine coolant temperature signal not reliable
Downstream
oxygen
sensor
Upstream
oxygen
sensor
Main
relay
Main
relay
Fig.4.3.015
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