Chery QQ Manuel de service télécharger pdf (Page 19)

CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM

Service notice:

 For the inductive engine speed sensor, it is

permitted to take out from its pack before it

is assembled to the auto or testing device

right away.

 Inductive engine speed sensor is assembled

by press in method but not hammer tapping.

 Tightening torque is 8.2Nm. Gas clearance

between inductive engine speed sensor and

pulse disc is 0.8 - 1.2mm.

3)Purpose: Speed sensor provides engine speed,

crankshaft angle and top dead center signal to

ECU. That will control engine ignition and

injection timing.

4)Working principle: The inductive engine

speed sensor work together with pulse disc, it is

used in ignition system without distributor

providing engine speed and crank shaft top dead

center information. Speed sensor is made up of

a permanent magnet and coil outside of magnet.

Pulse disc is a tooth disc with 60 teeth originally

but there are two teeth opening. Pulse disc is

assembled on crank shaft and rotate with

crankshaft. When the tip of the tooth passed the

end of inductive engine speed sensor, the

magnet pulse disc incises the magnetic line of

force, generating rotating speed signal and

output.

5)Working temperature:-40--120★

Resistance of coil in room T:731--989Ω

6)Malfunction and diagnosis method:

 Malfunction: can not start etc.

 Reason: man failure

 Service notice: use pressing method but not

a hammer to install it.

 Simple measure method: disconnect the

joint, put digital multimeter to ohm shift,

connecting two meter pen to No. 2 and No.

Speed sensor

Chart 3-9 Circuit diagram of speed

sensor

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Chery QQ Manuel de service Page 19

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