Chery QQ6 Service Manual download pdf (Page 84)

13. Safety Precautions for System Maintenance

13.1 Safety Precautions for Diagnosis and Maintenance of Gasoline

Injection Electronic Control System

(1) Disassembly and assembly requirements for electronic control unit (ECU):

Controllers shall be removed before welding or paint-baking;

When disassembling and installing the controller, be sure to set ignition switch to

CLOSE position and disconnect the battery with the system for fear to damage the

engine control unit during disassembly and installation.

Power supply wires shall not be removed from battery when engine is in operation or

electric system is in use;

Do not use such heavy current equipment as charger etc. to start the engine by direct

bridging;

Note that the ambient temperature for the controller should not exceed 80.℃

(2) Requirements for cleanness: the following rules should be observed for any

operation on oil-supply system and oil-injection system:

The parts removed should be place at a clean site and covered properly; do not use the

cloth (cotton cloth and gauze) with falling off fibre;

(3) Connect and disconnect the connectors of all sorts of harnesses and the connectors

of failure diagnosis testers only after the ignition switch is turned off.

When measuring mains voltage or ground wire grounding of the electronic control

system, be sure to check if the connection order and mode are correct;

Disconnect power cord or ground wire of battery from the system and disconnect

harness connector of ECU; both operation modes above may cause loss of information

about diagnosis and self-study stored in ECU (the retention time of information after the

ECU installed is power off depends on the model).

(4) Attentions during maintenance of fuel feed system (fuel feed line, fuel pump

and fuel injection system):

Disassembly or installation of oil pump on the tank full of oil or partly full of oil,

please note:

Before operation, get material ready near the fuel tank opening for absorption of heavy

discharging fuel, so that, the fuel discharged can be duly absorbed;

Avoid skin from direct contact with gasoline as best as you can;

Before loosening a connection part, thoroughly clean this part and the area around the

connecting pieces;

Dishcloth shall be placed around the connecting part for avoide oil-spraying;

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Chery QQ6 Service Manual Page 84