Chery QQ6 Service Manual download pdf (Page 15)

(close to 100mV). The signal voltage will mutate near theoretical equivalent air-fuel ratio (λ=1), see

the figure above.

Every oxygen sensor bears a cable and the other end of the cable is the wire connector. The wire

connector of oxygen sensor produced by our company has four pins:

No.1 connects to the positive pole of heater power supply (white);

No.2 connects to the negative pole of heater power supply (white);

No.3 connects to signal negative pole (gray);

No.4 connects to signal positive (black).

7.3 Parameters of technical features

l The requirement to exhaust pipe: the segment of exhaust pipe in the area before the oxygen

sensor must be heated up rapidly. If possible, the exhaust pipe should be designed to be tilting

down to avoid accumulation of condensed water in front of the oxygen sensor.

l Do not inappropriately heat up the metal snap ring of the cable at oxygen sensor side, especially

after the engine is shut down.

l Do not apply purge fluid, oiliness fluid or volatile solid on connector of the oxygen sensor.

l The screw thread of the oxygen sensor is M18×1.5.

l The size of the hexagonal head wrench for the oxygen sensor is 22-0.33.

The tightening torque for the oxygen sensor is 40-60Nm.

7.4 Failure effects and judgment method

l Failure effects: poor idling, poor acceleration, over proof tail gas and excessive fuel

consumption etc.

l General causes of the failure:

1. Moisture entering inside of sensor, and when the temperature is changed, the pin will be

broken;

2. The oxygen sensor “intoxicates”. (Pb, S, Br, Si)

Maintenance precautions: application of cleaning fluid, oiliness fluid or volatile solid on the

oxygen sensor during maintenance is prohibited.

l Simple measurement method:

1. Remove joint, put digital multimeter to ohm shift, connect meter pen to No.1 (white) and

No.2 (white) pins of the sensor. The resistance value is 1~6Ω at constant temperature.

2. With the joint connected, under idle speed state, when the working temperature of the oxygen

sensor reaches 350, turn the digital multimeter to DC Voltage shift and connect the two meter pens ℃

respectively to 3# (gray) and 4# (black) pins; at this point, the voltage should fluctuate rapidly

between 0.1-0.9V.

Main relay 者 87#

xygen s

ensor

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Chery QQ6 Service Manual Page 15