Chery A11. Manual — part 118

coolant temperature reaches specified value (about 65℃). When engine warming up, ECU

will send a square wave signal to carbon canister. Carbon canister on and off is regulated

by cycle ratio of signal itself. Therefore ECU may control fuel vapor quantity input to

intake manifold, preventing mixture richness making an abrupt change.

When throttle is at idle position, engine speed less than 1500 rpm, intake manifold pressure

lower than a preset value and air/fuel mixture richness self-adapt, carbon canister solenoid

keep closed to ensure an more optimum engine performance.

(3) Fuel tank ventilation safety valve

it has the following functionsThe valve is installed on filter cover and has following

functions upon pressure inside fuel tank:

1. When pressure inside fuel tank exceeds 0.1—0.18bar, fuel vapor will be given out from

outlet (safety function).

2. When 0.020—0.030bar vacuum is generated in the fuel tank, air is drawn in

(ventilation function)

6. Engine anti-theft system (optional)The engine anti-theft unit is an alien frequency radar

anti-theft unit.

Fig 13 Engine anti-theft unit schematic

1. Anti-theft ECU (ignition key) 2. Engine ECU 3.Anti-theft unit ECU

The alien frequencies radar anti-theft system is an electric device, connecting with engine

control system, prevent vehicle from disoperation. One of characteristics engine

anti-theft unit on and off need no additional operation by user. When use alien frequency

radar transponder, the function is on as the key turns off and the function is off as the key

turns on. Each time the key turn on, the engine ECU needs a special authentication code.

The authentication code is processed upon code stored in ignition switch circuit. Only this

condition meets can the engine start.

Alien frequency radar anti-theft unit mainly consists of 3 components: anti-theft ECU,

antenna and transponder.

Anti-theft unit ECU is in a black plastic box and usually located on instruments panel.

Its electric device is in-line with alien frequency radar transponder and connects with engine

ECU. Antenna is fixed in a special channel in ignition switch and consists of copper coil

wrapped by a plastic jacket and a connector, which can connect with anti-theft ECU. The

structure of anti-theft ECU is as shown in fig 14.

Fig 14 Anti-theft ECU

Anti-theft ECU pin definition

8-pin connector

3-pin connector

1 Not

used

1

Antenna

positive

2

warning indicator

2

not used

3 +30(12V)

3

Antenna

negative

4 ground

5 Not

used

6

to ECU serial surface

7 Not

used

8

+15 (ignition switch

positive)

Warning indicator

Warning indicator on instruments panel is controlled by anti-theft ECU, indicating user

state information. Warning indicator will flicker under following conditions:

1. The key is stored;

2. 2.5 seconds after the key turned on, the warning indicator begins to flicker, indicating

system is operating but engine will not be protected until the key is stored.

5. Electronic Control Fuel Injection System Maintenance

(1) Fuel

ONLY high quality vehicle unleaded gasoline of RESEARCH RULE octane value

RON90 or above (conform to SH0041 standard, lead content〈=0.005g/L〉, otherwise, the

electronic control fuel injection system and 3 way catalyst converter will be damaged,

affecting exhaust performance.. In addition, sulfur or lead can damage heated oxygen

sensor.

(2) Start-up

The electronic control fuel injection system can provide appropriate injection fuel width

under all conditions. Therefore depressing pedal is not necessary before or after hot or cold