4.5
Cleanfire Fuel Injection
4
Detonation Protection (DET)/RPM Limit
When DET is sensing and taking action to reduce
detonation, the driver may notice a drop in engine RPM
and/or reduced performance.
The ECU will illuminate the instrument cluster check
eng
ine LED and display “dET” on the LCD screen
whenever the DET system is active.
If the ECU determines the detonation cannot be controlled
by nor
mal means and further operation may cause engine
damage, the check engine LED will flash, the instrument
cluster will display “dET”, and the ECU will limit the
maximum engine speed to 6,500 RPM. The RPM limit will
remain active until the driver turns off and restarts the
engine.
If the detonation RPM limit occurs, a diagnostic trouble
c
ode (DTC) will be registered. Digital Wrench® will display
one of the following codes: 1352/0 (P1336), 1352/16
(P2336), 1353/0 (P1337), or 1353/16 (P2337).
DET Troubleshooting
If the check engine LED is illuminated and/or flashing with
“dET” displayed on the instrument cluster, reference the
following table.
NOTE: A DET Troubleshooting flowchart is located
at
the end of the chapter.
DET Protection RPM Limit Modes
MODEL
CHECK
ENGINE
LED/INSTRUMENT
CLUSTER MODE
RPM
LIMIT
600/800
DC-CFI-2/4
Check engine
LE
D illuminated/
“dET” displayed
on LCD
Driver may notice
slight dr
op in engine
RPM/power
Check engine
LED fl
ashing/
“dET” displayed
on LCD
6,500 RPM Misfire
T
urn off engine to
reset.
CAUSE OF DET ACTIVATION SOLUTION
Low fuel/no fuel in tank
Refill tank with recommended
fuel
Incorrect ethanol/non-ethanol
fuel resistor inst
alled
Verify correct fuel selector
resi
stor installed for fuel type in
tank
Poor quality fuel/water in fuel
Replace with higher quality
fuel
. Recommended 91 octane
minimum
Alcohol-based fuel additives
used with ethanol fuel
Do not use deicers or additives
that co
ntain any form of alcohol
when using ethanol-blended
fuel
Restricted fuel filter Replace fuel filter
Low fuel pressure
Verify fuel pressure is 58 psi (4
BAR) at
idle and while riding
Low fuel injector voltage
Verify fuel injection circuit is at
1
6 VDC when engine is
running
Faulty/plugged fuel injector
Use Digital Wrench® to
troub
leshoot
VES system malfunctioning
Verify valves are not stuck
o
pen, vent hoses are not
frozen or plugged
Knock sensor malfunctioning
Verify knock sensor screw
torqu
e is set to specification
Air leaks
Verify air intake system is
sea
led. Check throttle body
boots for cracks/tears/loose
parts. Remove after-market air
intake system.
Engine/exhaust modifications Remove modifications
Engine coolant temperature
high
Check cooling system. Ri
de
snowmobile on loose, un-
packed snow
Mechanical failure
Verify crankcase seals are
g
ood (not leaking). Verify
engine in good condition.
Check spark plugs.
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