4.20
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 lower seat base to access the TPS.
2. Disconnect the TPS harness connection (A).
3. Remove the mounting screw (B) and replace the sensor.
NOTE: If replacing the TPS or throttle body, you
must perform the “TPS Adjustment” procedure.
4. Refer to “TPS Adjustment” for setting the TPS voltage.
ENGINE COOLANT TEMPERATURE
SENSOR (ECT)
Operation Overview
Mounted on the cylinder head, the engine 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. If for
any reason the engine temperature sensor circuit is interrupted,
the fan will default to “ON”.
ECT Sensor Test
To quickly rule out other components and wiring related to the
ECT sensor, disconnect the harness from the ECT sensor. The
fan should turn on. This indicates all other components are
working properly.
Refer to Chapter 10 for ECT testing. Polaris dealers can also test
the sensor by using the Digital Wrench™ Diagnostic Software
(dealer only). Refer to the Digital Wrench™ User Guide for
more information.
ECT Sensor Replacement
1. Drain coolant to level below sensor.
2. Disconnect sensor from engine harness.
3. Using a wrench, remove and replace the sensor, applying
a light coating of thread sealant to aid installation.
4. Torque the sensor to 17 ft. lbs. (23 Nm).
TPS
A
B
Figure 4-19
ECT Sensor Resistance Readings
Temperature F (C) Resistance
68 F (20 C) 2.5 k 6%
212 F (100 C) 186 2%
= T
ECT Retaining Bolt Torque:
17 ft. lbs. (23 Nm)
Engine Coolant Temperature Sensor
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