4.25
ELECTRONIC FUEL INJECTION
4
P
RELIMINARY
V
ERS
I
ON
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 Learn Function (2010 Models)
The TPS automatically learns the idle setting at every key-on
occurrence. This function provides more consistent calibration
by compensating for TPS drift. However, if the TPS reading gets
below .690 Vdc or above .730 Vdc, the learn function is set to
default to the last successfully learned point and the “Check
Engine” or “MIL” indicator will illuminate. Performing the
“TPS Adjustment” procedure will remedy this problem.
TPS Tester / Regulator
The TPS reading can be checked by using the Throttle Position
Sensor (TPS) Tester (2201519-A).
IMPORTANT: TPS Tester 2201519-A replaces the
existing TPS tester (PU-47082), which included the
4010264 regulator. If your dealership has PU-47082
and 4010264 you DO NOT need to order 2201519-A as
a replacement.
Set-up the TPS Tester Wire Harness (PU-47466) and TPS Tester
Regulator (547927) 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 loosen the throttle body stop screw or alter
its position in any manner. The stop screw controls
the air flow calibration of the throttle body. If the
stop screw is repositioned or adjusted, the throttle
body assembly must be replaced.
TPS Connector
Throttle Body
Stop Screw
(Factory Set)
Yellow
(Output)
Blue
(Input)
Black
(Ground)
TPS
DO NOT ADJUST
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