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FUEL SYSTEM / FUEL INJECTION
4.15
THROTTLE POSITION
SENSOR
(TPS)
The throttle position sensor (TPS) is used to indicate
throttle plate angle to the ECU.
Mounted on the throttle body and operated directly off
the end of the throttle shaft, the TPS works like a
rheostat, varying the voltage signal to the ECU in
direct correlation to the angle of the throttle plate. This
signal is processed by the ECU and compared to the
internal pre--programmed maps to determine the
required fuel and ignition settings for the amount of
engine load.
NOTE: The correct position of the TPS is
established and set at the factory. Do not loosen
the TPS or alter the mounting position. If the TPS
is repositioned, replaced or loosened it must be
recalibrated.
THROTTLE POSITION SENSOR TEST
The throttle position sensor (TPS) is a non--serviceable
item. If it is faulty, it must be replaced. It can be tested
using the following method:
G Set up the TPS voltage check tool,
PN PU--47082, according to the
instructions. Make sure that the 9volt
battery has a minimum of 6 volts.
Figure 2.
Figure 2
Red
Pink
Black
No ’Jumps’ in read--out
.70--.99v
Vdc
Black Probe
Red Probe
Tool PN PU--47082
R
Y
BK
G With the test leads connected and
the meter set, move the throttle open
and closed slowly while reading the
display. The voltage should increase
smoothly with no ’jumps’ or
decreases when the throttle is
applied.
G If the sensor does not function
correctly, replace it.
THROTTLE POSITION SENSOR
REPLACEMENT
Thecorrectposition oftheTPS isestablished and
set at the factory. If the TPS is repositioned,
replaced or loosened it must be recalibrated.
1. Remove the front fender assembly and fuel tank.
2. Disconnect sensor from the harness.
3. Loosenand rotate the throttle body to gain access
to the retaining screw.
4. Remove the retaining screw and replace the
sensor.
5. Refer to “TPS Initialization” for setting the TPS
voltage.
THROTTLE POSITION SENSOR
INITIALIZATION
Thecorrectposition oftheTPS isestablished and
set at the factory. Use this procedure only if
the
TPS was repositioned, replaced or
loosened.
This set procedure can be accomplished with the
throttle body attached to the engine. This
procedure is meant to allow the TPS flow and idle
offset voltage to be correctly set without the use of
a flow bench. No steps can be eliminated.
Step 1
Establishing zero offset voltage: This step is
crucial as it sets the TPS position using a fixed
physical stop. This will insure that the correct offset
voltage is reached once the correct throttle body flow
is set.
Figure 1
Throttle Plate
must be closed
G Remove cover and disconnect
throttle cable from throttle cam.