Chery QQ6 Service Manual download pdf (Page 25)

gases as carbon dioxide and water etc. At 300-800, the conversion efficiency of three℃ -way

catalytic converter is maximum; with a temperature below this scope, the conversion efficiency will

be very poor, while, with a temperature above this scope, the three-way catalytic converter may be

burnt out. Three-way catalytic converter can exert better conversion efficiency only when the

oxygen sensor works. In control strategies of ECU, there are several protective modes for three-way

catalytic converter, and ECU can protect the three-way catalytic converter by regulating air-fuel ratio

and ignition advance angle.

15. Fan Control

15.1 Function:

In order to abstract heat from engine system and from condenser with A/C turned on, fan

control is affected by the signal to ECU sent by water temperature sensor; When water temperature

is high (above the threshold value set by ECU), the fan will run, and when water temperature is low

(below the threshold value set by ECU), the fan will also run; with A/C turned on, the fan will run at

low speed.

15.2 Composition:

DC electric motor double fan (high and low speed change).

15.3 Installation requirements:

The fan is installed between the rear of radiator and the engine, be careful when installing: not

to damage fin of fan blade, otherwise, running noise of the fan will increase, if serious, it may lead to

sharp fall of heat radiation effect of the engine.

15.4 Failure diagnosis:

Fan control circuit is a short or open circuit to ground;

The fan has failure itself;

Too loud fan noise;

Failure in power supply circuit of fan.

15.5 Troubleshooting:

First, validate whether it is a high speed fan system problem or a low speed fan system problem.

Provided that this is a fan control system problem, use a diagnostic tester to locate the failure point,

and then validate whether it is a short-circuit or a break in control circuit.

Failure symptom: the fan failure may result in rise of engine coolant temperature and poor

refrigeration of A/C system.

15.6. Fan Control:

Turn-on of low gear of fan:

1. Temperature of engine coolant: 96℃-102;℃

2. On request for A/C, the fan will start up;

3. When driving speed is too high, the fan will start up;

High speed startup of fan:

1. Engine coolant temperature sensor failure;

2. Air flow meter failure;

3. Engine coolant temperature exceeds 102.℃

Pins:

Main relay

High speed

relay of fan

Low speed

relay of fan

Brief sketch map of fan control

Fan motor

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 84 85

Comments to this Manuals

No comments

Chery QQ6 Service Manual Page 25

Comments to this Manuals

Related products and manuals for Cars Chery QQ6