Snowmobile Polaris IQ (2007-2008 year). Manual - part 24

4.14

Fuel Systems

CARBURETOR ADJUSTMENT

Throttle Valve Synchronization

All throttle valve synchronization adjustments are made to the
MAG throttle valve.  The PTO throttle valve is non-adjustable
and considered the base throttle valve.

Throttle valve synchronization can be performed with the
carburetor rack installed or removed from the engine.

1.

If running, turn off engine. Remove the air box.

2.

Remove the carburetor covers.

3.

Hold the throttle bell crank wide open on the carburetor.

4.

The bottoms of each throttle valve should be flush with the
top of the intake bores.

5.

If adjustment is required, hold the PTO carburetor flush
with the top of intake bore. Turn the throttle stop screw in
or out to set the PTO throttle slide flush with the intake
bore.

6.

Once the PTO carburetor slide is flush, loosen the Phillips
head screw, located under the top cover on the MAG
carburetor.

7.

While holding the PTO carburetor slide flush to the top of
the carburetor, rotate the synchronization nut clockwise to
raise the slide and counterclockwise to lower the slide.

8.

Adjust the synchronization nut until it is even with the PTO
slide.

9.

Once this is flush, lock the locking screw.

10. Replace the carburetor covers.

11. If removed, reinstall the fuel, vent, throttle, and choke hose

and cable connections.

12. Verify and set throttle cable free play.

Lock Screw

Sync Nut

4.15

Fuel Systems

4

CLEANFIRE™ FUEL INJECTION

System Overview

The Cleanfire™ fuel Injection system is a battery-less engine
management, capacitive discharge ignition, four fuel injector
engine management system.

System components include:

• ECU: The ECU controls the ignition / fuel injection 

angles, chassis / battery relays, and supplies the MFD 
gauge with tachometer / water temp. / PERC / HOT / 
DET / diagnostic information.

• Stator: The stator consists of a lighting charge coil, 

ignition exciter coil, fuel injector charge coil and two 
independent external crank position (two and five 
pulse) coils.

• Flywheel: The CFI flywheel houses the magnets for 

energizing the stator windings as well as two 
independent encoder ribs. The set of two encoder ribs 
are spaced 180 degrees apart from each other and 
provide RPM information required at engine start up. A 
set of five encoder ribs is responsible for crank angle 
detection, speed, and direction information.

• Regulator / Rectifier: Responsible for converting Vac to 

Vdc for the chassis and battery (electric start) circuits. 
Regulates voltage to 14.5 Vdc. Also supplies fuel 
injector “boost” power when engine RPM is 700 RPM 
or less.

• Capacitor: The capacitor suppresses voltage spikes and 

ensures consistent voltage throughout the chassis 
(RED/WHT) circuit.

• Chassis Relay: The chassis relay is activated by the 

ECU at approximately 950 RPM. Below 950 RPM, all 
power supplied by the regulator / rectifier (RED circuit) 
is used to power the ECU and fuel pump.

• Ignition Coils: Provide ignition energy to each spark 

plug. Both coils are fired at the same time.

• Fuel Injectors: CFI uses one set of full load injectors 

(located in the crankcase), and one set of part load 
injectors (located in each cylinder’s transfer port). The 
full load injectors are used at idle and high RPM 
speeds, while the part load injectors are used at low to  
mid engine speeds.

• Detonation Sensor: Located on the cylinder head, the 

detonation sensor transforms internal acoustic 

information into a signal the ECU uses to determine the 
amount of engine knock.

• Exhaust Valve Solenoid: Activated by the ECU, the 

solenoid controls the VES venting. When powered, the 
solenoid is open, allowing cylinder pressure to vent 
thus keeping the exhaust valves closed. When power is 
removed, the solenoid closes and the exhaust valves are 
allowed to open.

• Throttle Position Sensor (TPS): The TPS relays the 

position of the throttle plates (operator throttle input) to 
the ECU.

• Coolant Temperature Sensor: Relays the engine 

temperature to the ECU.

• Exhaust Temperature Sensor: Relays the temperature of 

the exhaust pipe to the ECU.

• Temperature / Barometric Air Pressure (T-BAP) 

Sensor: Relays the current intake air temperature and 
ambient air pressure to the ECU. The sensor is located 
on the airbox.

• Vehicle Speed Input: The ECU monitors the vehicle 

speed supplied by the vehicle speed sensor.

• Fuel Pump: Supplies fuel to the fuel injectors. Power to 

the fuel pump is supplied by the regulator / rectifier.

• Diagnostic Connector: The ECU can communicate with 

the Polaris Digital Wrench software and can be re-
flashed, monitored and will display trouble codes.

4.16

Fuel Systems

Diagnostic Trouble Codes (DTCs)

CFI Diagnostic Trouble Codes

T

ROUBLE

 C

ODE

P-C

ODE

MFD B

LINK

 

C

ODE

D

ESCRIPTION

Throttle Position Sensor Unrealistic 
Transition

P0120

1

TPS signal changes too rapidly to be correct. Can be 
caused by faulty connections or a faulty TPS.

Throttle Position Sensor Voltage High

P0123

TPS signal is above 4.39 Vdc. Can be caused by a 
faulty wire connection or faulty TPS.

Throttle Position Sensor Voltage Low

P0122

TPS signal is below 0.7 Vdc. Can be caused by a 
faulty wire connection or faulty TPS.

Engine Coolant Temperature Sensor 
Voltage High

P0118

2

Sensor signal is above 4.8 Vdc. Can be caused by a 
faulty wire connection or faulty temperature sensor.

Engine Coolant Temperature Sensor 
Voltage Low

P0117

Sensor signal is below 0.1 Vdc. Can be caused by a 
faulty wire connection or faulty temperature sensor.

Intake Air Temperature Circuit Voltage 
High

P0113

3

Sensor signal is above 4.9 Vdc. Can be caused by a 
faulty wire connection or faulty TBAP.

Intake Air Temperature Circuit Voltage Low P0112

Sensor signal is below 0.19 Vdc. Can be caused by a 
faulty wire connection or faulty TBAP.

Barometric Pressure Sensor Voltage High

P0108

4

Sensor signal is above 3.23 Vdc. Can be caused by a 
faulty wire connection or faulty TBAP.

Barometric Pressure Sensor Voltage Low

P0107

Sensor signal is below 1.25 Vdc. Can be caused by a 
faulty wire connection of faulty TBAP.

Exhaust Temperature Sensor Circuit 
Voltage High

P0546

5

Sensor signal is above 4.9 Vdc for at least 2 minutes 
and the engine has been running at or above 3000 
RPM.

Exhaust Temperature Sensor Circuit 
Voltage Low

P0545

Sensor signal is below 0.06 Vdc for at least 2 minutes 
and the engine has been running at or above 3000 
RPM.

Detonation Sensor Circuit Voltage High

P0328

6

Engine speed is above 6000 RPM and the sensor 
signal is above 4.3 Vdc for at least 2 seconds.

Detonation Sensor Circuit Voltage Low

P0327

Engine speed is above 6000 RPM and the sensor 
signal is below 1.23 Vdc for at least 2 seconds.

Exhaust Valve Solenoid Circuit 
Malfunction

P1477

8

Solenoid control circuit is OPEN. Can be caused by 
faulty wiring, solenoid, or ECU.

4.17

Fuel Systems

4

MAG Part Load Injector Circuit Open

P0261

7

OPEN circuit or short to ground. Can be caused by 
faulty wiring, injector, stator or ECU.

MAG Full Load Injector Circuit Open

P1261

PTO Part Load Injector Circuit Open

P0264

PTO Full Load Injector Circuit Open

P1264

Fuel Injector Voltage Too High

P2148

Engine is running, but the injector voltage is above 
the acceptable limit. Can be caused by faulty wiring, 
ECU or stator.

Fuel Injector Voltage Too Low

P2147

Engine is running, but the injector voltage is below 
the acceptable limit. Can be caused by faulty wiring, 
ECU or stator.

MAG Ignition Coil Circuit Malfunction

P0351

9

Failure within the primary circuit. Can be caused by 
faulty wiring, ignition coil, or ECU.

PTO Ignition Coil Circuit Malfunction

P0352

5 Tooth CPS Signal Missing

P0335

10

Engine is running, but there is no signal from the 5 
tooth CPS. Can be caused by a faulty stator, wiring or 
ECU.

5 Tooth CPS Signal Intermittent

P0336

Steady LED

Engine is running, but the pulses from the 5 tooth 
CPS are incorrect. Can be caused by a faulty stator, 
wiring harness or there is no 2 tooth CPS signal. If 
there is no 2 tooth CPS signal, the engine will not run, 
but the P0336 code will be set because the ECU 
receives extra 5 tooth signals without any 2 tooth 
signals.

5 VDC Sensor Supply Voltage Low

P0643

Sensor supply voltage is below an acceptable limit. 
Can be caused by faulty wiring or ECU.

Chassis Voltage High

P0563

System voltage is too high. Can be caused by faulty 
wiring or regulator / rectifier.

Chassis Voltage Low

P0562

System voltage is too low. Can be caused by a faulty 
wiring or regulator rectifier.

Ignition Voltage Circuit Malfunction

P0350

Engine is running but a problem is found with the 
ignition coil power circuit. Can be caused by faulty 
wiring or ECU.

Chassis Relay Coil Open Circuit

P1611

The chassis relay control circuit is open. Can be 
caused by faulty wiring or a faulty relay.

CFI Diagnostic Trouble Codes

T

ROUBLE

 C

ODE

P-C

ODE

MFD B

LINK

 

C

ODE

D

ESCRIPTION