Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
193
Injector drive-level fault
Oxygen sensor fault indication is set, with the fuel cycle quantitative control cut off; use the basic fuel
injection time stored in the ECU for the quantitative fuel control.
5. Diagnosis
Mainly check sensor wiring connection for short circuit, open circuit;
Sensor damages are generally caused by lead or phosphorus poisoning; so pay attention to the fuel
quality; meanwhile, excessive fuel consumption may also lead to sensor failure;
Changes of the oxygen sensors should be not less than a certain times in certain period of time.
6. Dismantlement and Installation
1) Dismantlement
①
Disconnect oxygen sensor harness connector.
②
Remove oxygen sensor with special remover.
Attention:
■
Plug mounting hole of the oxygen sensor with hairless cotton yarn to keep the debris or oil &
water away from the exhaust manifold.
■
Visually inspect appearance of oxygen sensor.
Reddish brown: lead poisoning
Off-white: normal
Black: carbon deposition
2) Installation
Fig. 4.3.016
Fig. 4.3.017
