Service manual

G420F(FE) Service Manual Chapter 5. Engine Management System (EMS) 200
Angle Sensor-Accelerator
Location
Description
Angle Sensor-Accelerator is located in the
accelerator pedal assembly. The engine speed
management deals with a Drive-by-wire system.
Drive-by-wire refers to the fact that the MI-07 control
system has no throttle cable from the foot pedal to
the throttle body. Instead, the ECM is electronically
connected both to the foot pedal assembly and the
throttle body. The SECM monitors the foot pedal
position and controls the throttle plate by driving a
DC motor connected to the throttle. The DC motor
actuates the throttle plate to correspond to the foot
pedal position when the operator depresses the
pedal. The SECM will override the pedal command
above a maximum engine speed and below a
minimum idle speed. The foot pedal assembly uses
two potentiometers to detect pedal position. These
two signals, accelerator pedal position 1 (APP1) and
accelerator pedal position 2 (APP2) are sent directly
to the SECM. The SECM uses a series of algorithms
to self calibrate and cross check the signals from the
pedal assembly.
[Circuit Diagram]
[Harness Connectors]
Inspection
1. Disconnect the Accelerator Pedal’s connector
from the main engine harness.
2. Inspect the electrical conditions with a follow
basic specification.
Signal output is on condition that input voltage
is 5V±0.5%
Rated current : 20Ma,
Power : 100mW,
Wire width : 20AWG
- At start point : Signal ’A’ 0.4V±0.1V
Signal ‘B’ 4.5V±0.1V
- At end point(Push for end) :
Signal ’A’ 3.60V±0.15V
Signal ‘B’ 1.39V±0.15V
3. If the result value is out of the specification,
replace the Accelerator Pedal.