Great Wall GW491QE, Service Manual

Page: 29 / 222

EF.1-11
United Electronic engine management system-Analysis of function /principal /
failure for system parts &components
Performance data
Measurement Value
Min. Typical Max.
Unit
Scope of testing pressure 20 115 kPa
Operation temperature -10 125
℃
Operation supply voltage 4.5 5.0 5.5 V
Current when US=5.0V 6.0 9.0 12.5 mA
Load current in output loop -0.1 0.1 mA
Load resistance to ground or to accumulator 50 k
Ω
Response time 0.2 ms
Weight 27 g
(h)Technical &characteristic parameter
Limit data
Measurement Value
Min. Typical Max.
Unit
Tolerable supply voltage
16 V
Tolerable pressure
500 kPa
Tolerable storage
temperature
-40 +130 ℃
3. Throttle position sensor DKG
(a)Function: this sensor is used to provide ECU with information concerning
the rotation angle of throttle valve. Based on such information, ECU may
obtain relevant information concerning engine load, working condition, (eg.
starting, idle-speed, reverse, partial load, full load), acceleration and
deceleration.
(d)Symptom bad acceleration, etc.
(e)Cause of general failures artifical failure.
(f)Precautions to maintenance take note of the installation position.
(g)Simple measurement method
(after disconnection of joint Have digital multimeter adjusted to the ohm position, connect two pens with Pin 1 and Pin 2 of
sensor respectively; And the resistance value at room temperatrure shall be 2k 20%; Connect two pens with Pin 1 and Pin 3 of
sensor respectively, rotate the throttle valve, and the resistance value will be subject to a linear change with the opening of throttle
valve; When connected with Pin 2 and Pin 3, an opposite situation will be produced.
Remark: When observing the change of resistance value, the main focus is to observe whether the resistance value has a larger leap.
(after connection of joint Open the ignition switch rather than to start the engine, have digital multimeter adjusted to the DC
voltage position, and connect the black pen to ground, the red pen to Pin 2, and a 5V reference voltage shall be produced; Connect the
red pen to Pin 3, and the voltage shall be at about 0.3V when throttle valve is at a full closed position, or about 3V when throttle valve
is at a full open position.
ProCarManuals.com