Chery QQ Service Manual download pdf (Page 28)

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

causticity liquid to wash it; 3, avoid it from

distorting by outside force.

Simple measurement method: connect fuel

pressure gauge at fuel intake pipe, start the

engine and make the engine running at idle speed;

check the fuel pressure around 350kPa or not;

step on the gas until the engine speed to

2500rpm,and observe if the fuel pressure at

around 350kPa.

3.13 ELECTRONIC THROTTLE VALVE AND

ACCELERATOR

1)Exterior drawing and pin

 Accelerator pin definition

Pin No.1 and No.2 is the anode of the 5V

reference voltage

Pin No.3 and No.5 is the cathode of 5V reference

voltage

Pin No. 4 and No. 6 is output voltage signal

 Electronic throttle valve pin definition

Pin No. 1 is motor anode.

Pin No. 2 is potentiometer anode.

Pin No. 3 is potentiometer cathode.

Pin No. 4 is motor cathode.

Pin No. 5 is signal output 1.

Pin No. 5 is signal output 2.

2)Installation position: Electronic throttle valve:

front end of intake manifold; accelerator: driver

cockpit.

3)Working principle: The engine on time torque

requirement was transferred from accelerator to ECU,

and ECU sends impulse electronic signal to electronic

throttle valve according to torque requirement

information; the motor is running and drive throttle

valve to its opening required degrees; this throttle

valve can stay at one fixed position or change to

another position upon required to meet the

Chart 3-25 Circuit Diagram of

Accelerator

Electronic Throttle Valve

Accelerator Pedal

Chart 3-24 Electronic Throttle Valve

and Accelerator

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