Tps Replacement; Engine Coolant Temperature Sensor (Ect); Ect Sensor Test - Polaris 2009 Sportsman XP 850 Service Manual

ELECTRONIC FUEL INJECTION

TPS Replacement

NOTE: The correct position of the TPS angle on the
throttle body is established and set at the factory. If
the TPS is replaced, repositioned or loosened it
must be recalibrated. Refer to the "TPS Adjustment"
procedure.
1. Remove the seat and upper left-hand side panel (see
Chapter 9 "Seat and Side Panels").
2. Loosen the hose clamp retaining the intake boot to the
intake plenum.
3. Remove the (4) bolts retaining the intake plenum and
throttle body.
4. Position the throttle body to access the TPS harness and
mounting screws.
5. Disconnect the harness from the TPS.
Disconnect
6. Remove the (2) Phillips-head mounting screws and replace
the TPS.
IMPORTANT: If replacing the TPS or throttle body,
you must perform the "TPS Adjustment" procedure.
7. Refer to "TPS Adjustment" for setting the TPS voltage.
3.22
ENGINE COOLANT TEMPERATURE
SENSOR (ECT)
Operation Overview
The engine coolant temperature sensor measures coolant
temperature. The engine temperature sensor is a Negative
Temperature Coefficient (NTC) type sensor, as the temperature
increases the resistance decreases.
Coolant passes through the cylinder and by the sensor probe,
varying a resistance reading which is relayed to the ECU. This
signal is processed by the ECU and compared to its
programming for determining the fuel and ignition
requirements during operation. The ECU also uses this signal to
determine when to activate the fan during operation.

ECT Sensor Test

To quickly rule out other components and wiring related to the
ECT, disconnect the harness from the ECT sensor and start the
engine. After a few seconds, the fan should turn on and the
"Over Temp" indicator should display on the instrument cluster.
This indicates all other components are working properly.
Refer to Chapter 4 for additional ECT information. Polaris
dealers can test the sensor by using the Digital Wrench™
Diagnostic Software (dealer only).
ECT Sensor Resistance Readings
Temperature °F (°C)
32 °F (0 °C)
68 °F (20 °C)
176 °F (80 °C)
212 °F (100 °C)
Resistance
5.9k Ω ± 5%
2.5k Ω ± 5%
323 Ω ± 5%
186 Ω ± 5%