Cooling System; Cooling Fan Description And Operation; Cooling Fan Testing; Fan Control Circuit Bypass Test - Polaris RZR XP Turbo Service Manual

ELECTRICAL

COOLING SYSTEM

COOLING FAN DESCRIPTION AND
OPERATION
The RZR Turbo fan is controlled by the ECU and a solid
state driver in the fan motor assembly.
Power is supplied through a 30 amp fuse to terminal 1 of
the fan connector.
The ground path for the motor assembly is provided
through terminal 2 of the fan assembly connector.
Terminal 4 of the fan assembly connector runs back to
141, or terminal 41 of ECU connector 1. This provides a
pulse-width modulated ground path that acts as the
control signal for the controller in the fan assembly. This
controls fan speed. The longer the ground path through
the ECU is left on, the faster the fan motor will spin.
11.44

COOLING FAN TESTING

The cooling fan circuit can be tested for proper function
by using Digital Wrench – Output State Control. From
this menu, you can turn the cooling fan off and on. If the
cooling fan does not come on when requested:
1. Disconnect the harness going to the fan and check
for power and ground on the main harness side using
a multimeter.
When performing this test, Fan Control must be set to
ON or no voltage will be seen.
2. If power is present, reconnect the fan harness and
remove the fuse box cover. Cycle the Fan control ON
using Digital Wrench and check voltage on both sides
of the fan circuit breaker.
• If voltage is being lost, jump power directly to the fan
and use an inductive amp clamp around the fan power
wire.
• Normal running amperage for the fan is 15–20 amps
but will be momentarily higher when the fan first kicks
on.
3. If no power is present, isolate it to a power or ground
issue.
• Ground wire back to battery negative should have less
than 1 Ω.
• Power side should show battery voltage. If battery
voltage is not seen, check voltage at the fan circuit
breaker.

FAN CONTROL CIRCUIT BYPASS TEST

1. Disconnect harness
sensor on the engine cylinder head (see Engine
Coolant Temperature
outlined in this chapter).
9928491 R04 - 2017-2018 RZR XP Turbo / XP4 Turbo Service Manual
NOTE
from coolant temperature
Sensor (ECT) Overview
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