Page 250 - Foton Workshop Manual - Aumark (BJ1099)

11-24 ENGINE CONTROL SYSTEM - FRONT OXYGEN SENSOR

OVERHAUL

1. Check oxygen sensor
(a). Disconnect the oxygen sensor connector.
(b). n the Power "OFF" Condition, check the
resistance between No.1 and No.2 pin of
1 2 3 4
oxygen sensor.
Resistance: 2.5Ω-4.5Ω (20℃ )
NOTICE:
While checkup, check the resistance at the sensor
side with digital multimeter.
Ω

fuwx11009

(c). Connect oxygen sensor connector.
(d). Connect diagnostic device, start engine, read the voltage of oxygen sensor on
diagnostic device. When the engine operates above 3min and the oxygen sensor
temperature reaches above 350 ℃ , the oxygen sensor voltage shall continuously
change between 0.1V-0.9V. If there is no change, it indicates that the sensor is
"poisoned", invalid or damaged.
NOTICE:
If the checkup is not in conformity with the regulations, it indicates that the oxygen sensor
is damaged and should be replaced.

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