Section 04 FUEL SYSTEM
Subsection 02 (ELECTRONIC FUEL INJECTION (EFI))
smr2009-030-032_a
CONNECTOR PIN-OUT
Throttle Actuator Operating Positions
Two torsional springs are connected with the
throttle plate. A main spring and another one in a
plunger mechanism.
When there is no power on the throttle actuator
(ETA), the plunger mechanism maintains the throt-
tle plate to a rest position. This also serves as the
limp home position.
When the throttle plate is opened by the ETA, it
acts against the main spring. If the ETA failed, the
return spring would bring back the throttle plate to
the limp home position.
ECM
ENGINE
THROTTLE BODY
OFF
Stopped
Throttle actuator: Off.
Throttle plate: Rest position, maintained
opened at approximately 8°
(1)
. This is
also the limp home position.
ON
Not
started
Throttle actuator: On.
Throttle plate: Moves from the
rest position to approximately 14°. It
then moves back to the rest position.
This is the diagnostic mode where the
rest position, actuator opening force to
overcome the return springs and the
motor return rate are monitored. If any
of these parameter are out of range, a
fault code is initiated.
ON
Started.
Normal
operation
at idle
Throttle actuator: On.
Throttle plate: Moves from the
rest position to idle position
(approximately 1-3°) according to
ECM injection and ignition maps.
Throttle plate is opened and closed as
necessary to control the idle speed.
ON
Started.
Normal
operation
at various
RPM
Throttle actuator: On.
Throttle plate: Opens and closes
according to ECM torque management
priorities.
(1) Degree values are given from the fully closed position.
Throttle-Body Faults and Effects
NOTE:
Among other things, a weak or broken
spring and a sticky throttle plate (carbon build-up,
dried salt water etc) are validated by the throttle
body diagnostic mode.
FAULT
EFFECT
Partial failure
of TAS sensor
(one internal
sensor only)
Limp home mode. Engine speed limited to idle.
ECM will use the remaining TAS sensor.
Fault code set and beeper
activated to emit warning signals.
Check engine light is turned ON.
Driveability could be reset by releasing
and reapplying the throttle.
Complete
failure of
TAS sensor
(both internal
sensors)
Limp home mode. Engine
speed limited to 2500 RPM.
Fault code set and beeper
activated to emit warning signals.
Check engine light is turned ON.
Any throttle
body failure
Limp home mode. Engine
speed limited to 2500 RPM.
Engine speed can still be increased up
to 3200 RPM using the throttle lever.
Fault code set and beeper
activated to emit warning signals.
Check engine light is turned ON.
NOTE
: When one of these fault is active, OTAS and iBR will
continue to monitor their input signals. However, since the
engine speed is limited, the OTAS will not be activated. Also,
since the ECM cannot control the throttle body, the iBR might
come in fault because the ECM does not react to his specific
torque request. It all depends on the circumstances when the
iBR is applied. (vehicle and engine speed will be a factor).
Throttle Body Lubrication
No lubrication is required.
Throttle Body Cleaning
To gain access to throttle body, remove the re-
quired parts as described in
THROTTLE BODY RE-
MOVAL.
Check throttle body cleanliness using a flashlight.
Fully open throttle plate and verify:
– Throttle body bore
– Throttle plate edge.
Look for:
– Dirt
– Oily surfaces
– Carbon deposits on throttle plate and the sur-
rounding bore.
Clean as necessary.
Use a throttle body cleaner such as GUNK INTAKE
MEDIC or the equivalent.
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