Page 500 - Manual Oficina XP 1000 14-16
P. 500
ELECTRICAL
COOLING SYSTEM
FAN CONTROL CIRCUIT OPERATION / ENGINE COOLANT TEMPERATURE
TESTING SENSOR (ECT) OVERVIEW
Power is supplied to the fan via the Orange/Black wire Mounted in the thermostat housing, the engine
when the relay is ON. The ground path for the fan motor temperature sensor q measures coolant temperature.
is through the Brown harness wire. Refer to Relay The engine temperature sensor is a Negative
Operation, page 11.41 later in this chapter for more Temperature Coefficient (NTC) type sensor, as the
information on fan functions. temperature increases the resistance decreases.
CAUTION
Keep hands away from fan blades during operation.
Serious personal injury could result.
NOTE
The fan may not function or operation may be delayed if
coolant level is low or if air is trapped in the cooling
system. Be sure cooling system is full and purged of air.
FAN CONTROL CIRCUIT BYPASS TEST
1. Disconnect harness from coolant temperature
sensor on the engine cylinder head (see Chapter 4).
Coolant passes through the thermostat housing and by
2. With the transmission in Park, start the engine. After the sensor probe, varying a resistance reading which is
a few seconds, the fan should start running and the relayed to the ECU. This signal is processed by the ECU
“Check Engine” indicator should display on the and compared to its programming for determining the
instrument cluster. This indicates all other fuel and ignition requirements during operation. The ECU
components are working properly. also uses this signal to determine when to activate the
cooling fan during operation.
3. If the fan does not run or runs slowly, check the fan
motor wiring, ground, motor condition, circuit breaker
and mechanical relay for proper operation. Repair or ECT SENSOR TEST
replace as necessary. If the fan runs with the sensor To quickly rule out other components and wiring related
harness disconnected, but will not turn on when the to the ECT, disconnect the harness from the ECT sensor
engine is hot, check the coolant temperature sensor and start the engine. After a few seconds, the fan should
and connector terminals. turn on and the “Check Engine” indicator should display
on the instrument cluster. This indicates all other
components are working properly.
11.28 9926816 R06 - 2014-2016 RZR XP 1000 / XP4 1000 Service Manual
© Copyright Polaris Industries Inc.
