Service Manual

3.19
ELECTRONIC FUEL INJECTION
3
THROTTLE POSITION SENSOR (TPS)
Operation Overview
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.
TPS Resistance Tests
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:
Using an Ohm Meter:
With the test leads connected and the meter set to the ohms scale,
observe the reading at the following pin locations of the TPS:
TPS Tester Kit
The throttle position sensor (TPS) reading can be checked by
using the TPS Tester Kit (2201519).
Set-up the TPS Tester Kit (2201519), according to the
instructions that accompanied the tester. Make sure the 9 volt
battery is new.
The correct position of the throttle body
stop screw is established and set at the
factory. DO NOT remove the tamper proof
cap to adjust the throttle body stop screw or
alter its position in any manner. The stop
screw controls the air flow calibration
of the throttle body.
Throttle
TPS
Body
Stop Screw
(Factory Set)
DO NOT ADJUST
Throttle
Body
TPS Resistance Readings
Pins Throttle Position Resistance
d-GND ----- ∞
c-d Closed 4kΩ - 5kΩ (reference)
c-d Open
1150Ω - 1250Ω
(reference)
c-e ----- 4kΩ − 6kΩ
1
2
3
TPS Connector
TPS Tester
P/N - 2201519
Use a New
9V Battery