Chapter VI Fuel System
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
397
Fig. 6-1-31 Working principle of accelerator
pedal position sensor
ECU detects this voltage and judges the knock intensity
according to the voltage.
The installation of the knock sensor: install the knock
sensor and 1 hexagon flange face bolt (M6×12) to the
sensor hole on the exhaust manifold end of the cylinder
body and tighten them as per specified torque. The
mounting planes of the knock sensor and the cylinder
body should be well fitted without any clearance. See
Fig 6-1-30.
Tightening torque for fastening bolt of knock
sensor
23
N•m±3 N•m
2.7.5 Accelerator pedal position sensor
The working principle of potentiometer type pedal
position sensor is voltage divider circuit. ECU supplies
5V voltage for the sensor circuit. The accelerator pedal
is connected to the electric brush of the sliding rheostat
inside the sensor through the rotating shaft. The
voltages of the electric brush and the earthing end vary
as the position of the accelerator pedal position sensor.
The voltage sensing circuit inside the ECU will change
the voltage into the position signal of the accelerator
pedal. See Fig. 6-1-31.
on
ECU
(electronic
control
unit)
off
electric
brush
sensor
signal
ground
Voltage
sensing
circuit
