3-D RAVE Basic Operation

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Silvester Fields
6 years ago
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1 2007 All SUMMIT 800R 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: 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. 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: 1. Vacuum solenoid 2. Pressure solenoid 1 of 8

An arrangement of check valves and Y-fittings allows to separate the crankcase vacuum pulses from the pressure pulses. NOTICE THE CHECK VALVE ORIENTATION 1. Check valves 2.

When troubleshooting, ensure to check each RAVE valve. Raise rear of snowmobile and retain with an appropriate suppo rt.

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.

Disconnect hose from RAVE valve or pressure solenoid outlet as per flow chart task. Connect the vacuum/pressure pump (P/N 529 021 800) to the hose to be tested. Install B.U.D.S.

2 An arrangement of check valves and Y-fittings allows to separate the crankcase vacuum pulses from the pressure pulses. NOTICE THE CHECK VALVE ORIENTATION 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. When troubleshooting, ensure to check each RAVE valve. Raise rear of snowmobile and retain with an appropriate suppo rt. 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. Connect the vacuum/pressure pump (P/N ) to the hose to be tested. 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

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4 3-D RAVE Valve Troubleshooting Intermittent Engine Performance Problem RAVE Valve Operation with Solenoid Electrical Malfunction 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

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Re-assemble valve as per 2007 REV SHOP MANUAL RAVE Valves Inspection and procedures but pay attention to the following. Repair For more detailed procedures, refer to the 2007 REV SHOP MANUAL.

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.

Inspection Inspect valve guillotines for wear marks as shown. Repair If wear is found, sand down guillotines using fine sand paper until marks disappear.

8 Re-assemble valve as per 2007 REV SHOP MANUAL RAVE Valves Inspection and procedures but pay attention to the following. Repair For more detailed procedures, refer to the 2007 REV SHOP MANUAL. Removal Pull out RAVE valves ass'y. NOTE: Pay attention not to lose the small springs. NOTE: Do not disassemble bellows needlessly. 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. When installing valve ass'y in its housing, center valve horizontally and longitudinally then hand tighten screws. Push and pull valve to make sure it moves freely. Inspection Inspect valve guillotines for wear marks as shown. 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 Tighten screws and check valve for free movement again. If some friction is felt, slightly loosen screws and readjust housing then retighten screws. Repeat the process until a free movement is obtained. Start engine and recheck RAVE system operation. Reinstall remaining parts. 8 of 8

5. Engine Control Module (ECM) I/O Signal

5. Engine Control Module (ECM) I/O Signal 5. A: ELECTRICAL SPECIFICATION B134 B135 B136 B137 17 16 15 14 13 12 11 10 9 8 27 26 25 24 23 22 21 20 19 18 34 33 32 31 30 29 28 19 18 17 16 15 14 13 12 11 10 9 8 27 26 25 24 23 22 21 20 35 34 33 32 31