G643(E) Service Manual
Chapter 5. Engine Management System (EMS)
192
Electronic Throttle Body
[G643E and G643]
Location
Description
The MI-07 system uses electronic throttle control
(ETC). The SECM controls the throttle valve based
on engine RPM, engine load, and information
received from the foot pedal. Two potentiometers on
the foot pedal assembly monitor accelerator pedal
travel. The electronic throttle used in the MI-07
system is a Bosch 32mm electronic throttle body
DV-E5. The DV-E5 is a single unit assembly, which
includes the throttle valve, throttle-valve actuator
(DC motor) and two throttle position sensors (TPS).
The SECM calculates the correct throttle valve
opening that corresponds to the driver’s demand,
makes any adjustments needed for adaptation to the
engine’s current operating conditions and then
generates a corresponding electrical (driver) signal
to the throttle-valve actuator.
Circuit Diagram
[
G643E
]
Circuit Diagram
[
G643
]
[Harness Connectors]
Inspection
1.
Check for loose, dirty or damaged connectors and
wires on the harness
2.
Check the throttle assembly motor housing for
coking, cracks, and missing cover-retaining clips
3.
Check the resistance of TPS sensor. (refer as
blow chart)
SENSOR
POINT TO POINT
EXPECTED
RANGE
TPS PIN 2(GND) TO
PIN 6(TPS1 SIGNAL)
1.25K
Ω
+/-
30%
TPS PIN 3(PWR) TO
PIN 6(TPS1 SIGNAL)
1.25K
Ω
+/-
30%
TPS
(Throttle
Position
Sensor)
TPS PIN 1(+DRIVER)
TO PIN 4(-DRIVER)
~3.0K
Ω
+/-
30%
