3-D RAVE Basic Operation

Date: January 25, 2007
2007
Subject: 3-D RAVE Troubleshooting tips
All SUMMIT 800R
No. 2007-11
All
We have had some reports that the engine does not reach
its maximum RPM or poor acceleration could be
experienced.
The RAVE system should be first diagnosed as detailed
in this bulletin.
This bulletin is intended to help you to understand the basic
operation and to give you diagnostic procedures and tips to
help when working on 3-D RAVE engines.
3-D RAVE Basic Operation
3-step RAVE valves are used. Their positions vary according
to engine operating condition.
The RAVE valve steps are:
NOTE: 3-D RAVE valves may go through all the
3 positions of opening or skip the partially open
position and go directly to the fully open position or
to the fully closed position depending how quickly
the throttle is depressed and the engine load.
IMPORTANT: During engine warm-up when
engine coolant temperature is below 5°C (41° F)
or if it reaches 85°C (185°F) during operation, the
ECM will keep both solenoids activated (ON) to
fully close the RAVE valves.
Solenoids use crankcase pulses (pressure and
vacuum) to open or close the valves:
– Fully closed
– Partially opened
– Fully opened.
RAVE valves are activated by 2 solenoids that are controlled
by the ECM through mappings.
Many different mappings are used by the ECM to control
the 3-D RAVE valves. The mappings are based on current
engine RPM, crankshaft rate of acceleration or deceleration
and the following inputs: intake temperature, TPS, knock
sensor, engine coolant temperature and APS.
1. Vacuum solenoid
2. Pressure solenoid
1 of 8
Date: January 25, 2007
Subject: 3-D RAVE Troubleshooting tips
An arrangement of check valves and Y-fittings
allows to separate the crankcase vacuum pulses
from the pressure pulses.
No. 2007-11
When troubleshooting, ensure to check each
RAVE valve.
Raise rear of snowmobile and retain with an
appropriate support.
WARNING
Before running engine:
— Ensure track is free of any particles
which could be thrown out while
track is rotating. Keep hands, tools, feet
and clothing clear of track.
— Ensure no one is standing in
close proximity to the vehicle.
— Ensure belt guard is properly secured to
vehicle and be careful with the rotating
components of the transmission system.
Vacuum/Pressure Validation when Using Flow Chart
If the flow chart refers to checking vacuum or
pressure, refer to these procedures.
— Disconnect hose from RAVE valve or pressure
solenoid outlet as per flow chart task.
NOTICE THE CHECK VALVE ORIENTATION
— C o n n e c t t h e v a c u u m / p r e s s u r e p u m p (P/N
529 021 800) to the hose to be tested.
1. Check valves
2. V-fittings
Diagnostic Flow Chart
The following flow chart will validate proper
operation of RAVE valves or assist in
troubleshooting a malfunctioning RAVE system.
Install B.U.D.S. and ensure there are no fault codes
(active or occured). If so, see EMS FAULT CODES
PERTAINING TO RAVE AND DPM SYSTEMS in
this bulletin.
Preparation
Remove RAVE valve covers.
EXAMPLE: 1. Hose from RAVE solenoids
— Set pump to any position (vacuum or pressure).
— Start engine and read the gauge on vacuum/pressure
pump according to this chart.
2 of 8
Date: January 25, 2007
Subject: 3-D RAVE Troubleshooting tips
3 of 8
No. 2007-11
Date: January 25, 2007
Subject: 3-D RAVE Troubleshooting tips
3-D RAVE Valve Troubleshooting
RAVE Valve Operation with Solenoid Electrical
Malfunction
No. 2007-11
Intermittent Engine Performance Problem
— Check transmission (belt, drive and driven
pulleys).
— If engine will not always reach maximum
RPM: Check RAVE valves as per RAVE VALVE
INSPECTION AND REPAIR in this bulletin. Then, •
proceed with DIAGNOSTIC FLOW CHART to
validate RAVE operation.
EMS Fault Codes pertaining to RAVE and DPM
Systems
Check if fault codes pertaining to RAVE, DPM and other
systems are either active or occured. If so, proceed as
follows:
— Check each RAVE solenoid heater.
— Check if power wire (RED/YELLOW) of RAVE
solenoids, heaters and DPM is shorted to ground
or have any sign of damage.
— Check each RAVE solenoid.
Repair as required then use the
DIAGNOSTIC FLOW CHART to validate
RAVE valve operation.
RAVE Valve Position According to
Engine Operation
4 of 8
Date: January 25, 2007
Subject: 3-D RAVE Troubleshooting tips
5 of 8
No. 2007-11
Date: January 25, 2007
Subject: 3-D RAVE Troubleshooting tips
6 of 8
No. 2007-11
Date: January 25, 2007
Subject: 3-D RAVE Troubleshooting tips
7 of 8
No. 2007-11
Date: January 25, 2007
Subject: 3-D RAVE Troubleshooting tips
RAVE Valves Inspection and
Repair
No. 2007-11
Re-assemble valve as per 2007 REV SHOP MANUAL
procedures but pay attention to the following.
Removal
NOTE: If bellow was removed, take care that at installation
there is no strain in the bellow that could apply some
bending force or torsion to the RAVE valve. That may
contribute to a RAVE valve jam.
Pull out RAVE valves ass'y.
—
For more detailed procedures, refer to the 2007 REV
SHOP MANUAL.
NOTE: Pay attention not to lose the small springs.
When installing valve ass'y in its housing, center
valve horizontally and longitudinally then hand tighten
screws.
NOTE: Do not disassemble bellows needlessly.
— Push and pull valve to make sure it moves freely.
Inspection
Inspect valve guillotines for wear marks as shown.
— Tighten screws and check valve for free movement again.
If some friction is felt, slightly loosen screws and
readjust housing then retighten screws.
—
Repair
If wear is found, sand down guillotines using fine sand
paper until marks disappear.
When done, thoroughly clean valve components with a
solvent and wipe out with a clean rag.
Assembly/Installation
8 of 8
Repeat the process until a free movement is
obtained.
Start engine and recheck RAVE system
operation.
—
Reinstall remaining parts.
—