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Chery QQ6 Service Manual Page 9

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2.3 Parameters of technical features
Value Item
Min. Typical Max.
Unit
Resistance under a room temperature of
20°C
774 860 946
Ω
Inductance 310 370 430 mH
Output voltage at a crankshaft
revolution of 416rpm
>1650
mV
2.4 Installation attentions:
l For the inductive tachogenerator, it is permitted to take out from its pack before it is assembled
to the auto or testing device right away.
l Inductive tachogenerator is assembled by press in method but not hammer tapping.
l Partly micro-encapsulated bolt M6×12 for fixing of the inductive engine tachogenerator is
recommended.
l The tightening torque is 8±2Nm.
l Gas clearance between inductive tachogenerator and pulse disc tip is 0.8-1.2mm.
Dimension d (see the figure below): 4.7mm.
2.5 Failure effects and judgment method:
l Failure effects: start failure etc.
l General cause of the failure: man induced failure.
l Maintenance precautions: during maintenance, the tachogenerator should be installed by using
press-in method instead of hammering method.
l Simple measurement method:
1. With the joint removed, turn the digital multimeter to Ohm shift, and then connect the two
meter pens respectively to 2# and 3# pins; At 20, the rated resistance should be 860Ω±10%.℃
2. With the joint connected, turn the digital multimeter to AC Voltage shift, and then connect the
two meter pens respectively to 2# and 3# pins of the sensor; start the engine and voltage output
should be present at this point. (Inspection with vehicle oscilloscope is recommended).
Oscillogram in Test
Installation of the
tachogenerator
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