3.1.13-14
CS35 2013.04
3.1.13-14Electronic Control System - ME7
Accelerator Pedal Position Sensor
The accelerator pedal position sensor has an
internal damping design and contains two identi-
cal potentiometric sensors. The signal pointer of
the sensor shares the same shift with the pedal.
When the pedal is depressed, the potentiometer
pointer rotates with the pedal coaxially and with
the sliding of the pointer, the signal terminal out-
puts different voltage signals. To prevent signal
distortion due to engine voltage fluctuations, a
comparison circuit is used in the ECM, which
compares signal voltage output by the sensor
with reference voltage, and ECM uses percent-
age to determine the pedal amplitude. ECM com-
pares signals input by sensor 1 and sensor 2, and
judges together with engine speed, load and
other sensors the true or false condition of the
output signal. If signals from either of two sensors
are determined as distortion, ECU will control the
engine to enter into the fault mode, take restricted
driving measures and maintain certain opening of
the throttle.
Carbon Canister Sewage Solenoid
Carbon canister sewage solenoid is located at the
side of cylinder head, to control the sewage air
flow of carbon canister, carbon canister sewage
solenoid cleaning flow is controlled by the duty
cycle signal from the ECM, in the following condi-
tion, carbon canister will not conduct the dis-
charge work:
• A certain time after engine cold start.
• Low engine coolant temperature.
• Engine idle speed operation period.
• High engine load period.
• The important sensor of the system fails.
Main Relay
Main relay is located in the engine compartment
electric center, ECM controls the main relays to
realize the control of fuel pump, fuel injector, car-
bon canister sewage solenoid power supply.
Fuel Pump Relay and Fuel Pump
Fuel pump relay is located in the indoor electric
center, fuel pump is installed in the fuel tank. ECM
controls the pump relay closed, then the fuel
pump starts working, the system uses no oil
return fuel supply system, fuel pressure regulator
is on the fuel pump assembly.
A3113021
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