Ariens Sno-Thro Platinum Series Service Manual
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Ariens Sno-Thro Platinum Series Service Manual

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Service Guide
®
Platinum Series Sno-Thro
Models
921050 – Platinum 24 SHO
(SN 000101 +)
921051 – Platinum 30 SHO
(SN 000101 +)
921052 – Platinum 28 Track SHO
(SN 000101 +)
921053 – Platinum 24 SHO EFI
(SN 000101 +)
921057 – Platinum 28 SHO RapidTrak
(SN 000101 +)
921327 – Platinum 24 SHO EFI CE
(SN 000101 +)
E10
ENGLISH
05136030B • 9/18

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Summary of Contents for Ariens Sno-Thro Platinum Series

  • Page 1 Service Guide ® Platinum Series Sno-Thro Models 921050 – Platinum 24 SHO (SN 000101 +) 921051 – Platinum 30 SHO (SN 000101 +) 921052 – Platinum 28 Track SHO (SN 000101 +) 921053 – Platinum 24 SHO EFI (SN 000101 +) 921057 –...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Install Interlock Cams ........43 SAFETY .
  • Page 3 Installing unauthorized parts will not automatically void the warranty; however, the warranty will not apply if the installation and use of unauthorized parts damages the unit. The Ariens warranty applies solely to defects in Ariens materials and / or factory workmanship. Ariens disclaims liability for any claims or damages –...

  • Page 4: Safety

    Failure to follow these instructions and warnings may cause death or serious 4. Notice injury. If you have purchased this product from an Ariens NOTICE: Indicates information or procedures that are dealer, the dealer can provide you with training.

  • Page 5: Safety Decals

    SAFETY DECALS Stop engine, remove key, and read manual The safety decals on your machine are visual reminders of before making any repairs or adjustments. the important safety information in this manual. All messages on your unit must be fully understood and carefully followed.

  • Page 6: Safety Rules

    SAFETY RULES Handle fuel with care; it is highly flammable. • Use an approved fuel container. The following safety instructions are based on the B71.3 specifications of the American National Standards Institute • Never add fuel to a running engine or hot engine. in effect at the time of production.
  • Page 7 After striking a foreign object, stop the engine, remove the Never operate the snow thrower without good visibility or wire from the spark plug, disconnect the cord on electric light. Always be sure of your footing, and keep a firm hold motors, thoroughly inspect the snow thrower for any on the handles.
  • Page 8 Accessories operation or while performing an adjustment or repair to protect eyes from foreign objects that may be thrown from Use only Ariens Company-recommended attachments or the machine. accessories that are designed for your unit and that are appropriate to your use and can be used safely in your application.

  • Page 9: Draining Fuel System

    DRAINING FUEL SYSTEM SEPARATE HOUSING FROM FRAME Move unit to an open, well-ventilated area with no Remove Auger Housing flames or sparks. IMPORTANT: Save all hardware for reinstallation. Remove fuel tank cap and siphon fuel into a clean Stop engine, remove key and wait for moving parts to gasoline container.
  • Page 10 IMPORTANT: Discharge chute control designs differ based Generation 3 Chute Control Designs on serial number. Generation 2 chute control designs See Figure 5. appear as shown in Figure 4 and Generation 3 chute 10. Remove hairpin from clevis pin and partially remove control designs appear as shown in Figure 5.
  • Page 11 See Figure 7. 13. Remove hairpin, sleeve bushing and cable eyelet from deflector arm under dash panel. 14. With a pliers, compress cable anchor tabs and remove anchor from deflector bracket. IMPORTANT: Reinstall sleeve bushing and hairpin so parts are not misplaced. Figure 8 18.
  • Page 12 To assist belt removal, slowly pull recoil starter handle See Figure 13. while gently guiding belts out of attachment sheave. 22. Remove hardware securing auger housing to frame. 23. Lift auger housing rear slightly to disengage from mount rod and separate from unit. Figure 10 See Figure 12.

  • Page 13: Reinstall Auger Housing

    Reinstall Auger Housing See Figure 14. With assistance from an adult helper, engage attachment clutch lever so attachment brake will not obstruct attachment drive pulley in step 2. Lift auger housing rear and lower mount brackets onto mount rod. Figure 14 See Figure 16.
  • Page 14 11. Reinstall belt cover and secure left side with tapping Generation 2 Chute Control Design screw. Position right side under tapping screw and 23. Remove hairpin from chute control assembly and tighten. reinstall cable eyelet onto assembly. Reinstall hairpin. See Figure 18. 15.

  • Page 15: Bottom Cover Removal

    BOTTOM COVER REMOVAL CAUTION: AVOID INJURY. The track carriage IMPORTANT: Save all hardware for reinstallation. will rotate freely without the height-adjuster bracket. Keep fingers and hands away from WARNING: AVOID INJURY. Before placing unit pinch points. in service position, drain fuel from tank and fuel system.

  • Page 16: Install Bottom Cover

    Install Bottom Cover All Models 10. Remove hardware retaining bottom cover to frame Reinstall bottom cover and secure with two tapping and remove cover. See Figure 22. screws and four hex bolts. Models 921050, 921051, 921327: Advance to step 9. Models 921052, 921057 See Figure 23.
  • Page 17 Reinstall three carriage bolts through height adjuster bracket and reinstall spacers onto bolts. See Figure 24. Figure 23 See Figure 25. Figure 24 Secure height-adjuster plate to carriage bolts with three original flange nuts. All Models Reinstall cable eyelet onto lock finger and secure with Return unit to operating position.

  • Page 18: Attachment Drive Belt Replacement

    ATTACHMENT DRIVE BELT TRACTION DRIVE BELT REPLACEMENT REPLACEMENT Remove Attachment Drive Belts Remove Traction Drive Belt IMPORTANT: Save all hardware for reinstallation. IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool.

  • Page 19: Install Traction Drive Belt

    See Figure 29. Install Traction Drive Belt Disconnect idler spring from traction idler arm. See Figure 31. Remove stop bolt from frame. Install belt onto traction sheave and around traction drive pulley. Return swing gate assembly to upright position and reinstall stop bolt.

  • Page 20: Drive Idler Assembly Replacement

    DRIVE IDLER ASSEMBLY REPLACEMENT Remove Attachment Drive Idler Assembly IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts Measure to stop and for hot parts to cool. Here Disconnect spark plug wire from engine. Remove auger housing.

  • Page 21: Remove Traction Drive Idler Assembly

    Remove Traction Drive Idler Assembly Install Traction Drive Idler Assembly IMPORTANT: Save all hardware for reinstallation. See Figure 37. Stop engine, remove key and wait for all moving parts Reinstall traction drive idler assembly and torsion to stop and for hot parts to cool. spring onto idler pivot rod.

  • Page 22: Install Attachment Drive Idler Assembly

    Install Attachment Drive Idler Assembly ATTACHMENT BRAKE REPLACEMENT See Figure 39. Remove Attachment Brake Secure attachment idler arm to hub with original IMPORTANT: Save all hardware for reinstallation. tapping screws. Stop engine, remove key and wait for all moving parts Reinstall torsion spring around attachment idler arm.
  • Page 23 See Figures 42 and 43. WARNING: AVOID INJURY. Before placing unit Engage and disengage attachment clutch to verify in service position, drain fuel from tank and fuel brake roller on attachment idler does not interfere with system. See Draining Fuel System on page 7. brake pad.

  • Page 24: Friction Disc Replacement

    Remove hardware securing bearing to left side of FRICTION DISC REPLACEMENT frame and remove bearing. See Figure 46. Remove Friction Disc IMPORTANT: Save all hardware for reinstallation. WARNING: AVOID INJURY. Before placing unit in service position, drain fuel from tank and fuel system.

  • Page 25: Install Friction Disc

    Remove hex shaft from friction disc assembly and remove friction disc assembly. See Figure 48. Figure 49 See Figure 51. Figure 47 Reinstall spring clips into hex shaft. Install Friction Disc Reinstall bearing onto hex shaft end. Align friction disc assembly with shift fork roller Reinstall bearing flange over bearing and secure to bearing and hex shaft.

  • Page 26: Hex Shaft Bearing Replacement

    11. Adjust speed selector lever. Refer to Operator’s HEX SHAFT BEARING REPLACEMENT Manual for adjustment procedure. Remove Bearing IMPORTANT: Check all adjustments after first use. IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool.

  • Page 27: Swing Gate Replacement

    See Figure 54. SWING GATE REPLACEMENT Remove traction drive clutch cable and return spring Remove Swing Gate Assembly from swing gate. IMPORTANT: Save all hardware for reinstallation. IMPORTANT: To gain more cable slack, traction drive Stop engine, remove key and wait for all moving parts clutch cable may need to be removed from traction clutch to stop and for hot parts to cool.

  • Page 28: Install Swing Gate Assembly

    Remove swing gate assembly. See Figure 56. Reinstall traction drive clutch cable and return spring onto swing gate. See Figure 58. Figure 57 IMPORTANT: If traction drive clutch cable was removed from traction clutch lever, reinstall cable to lever. See Figure 86.

  • Page 29: Reduction Shaft Bearing Replacement

    Position reduction shaft as far to the right side of unit REDUCTION SHAFT BEARING as possible and remove spring clip from shaft. See REPLACEMENT Figure 59. Model 921057 Remove Bearings IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool.

  • Page 30: Install Bearings

    See Figure 61. Install Bearings Remove hardware retaining bearing flanges. Press bearings into bearing flanges and install onto reduction shaft. Reposition reduction shaft as needed and remove bearings from brace. Secure bearing flanges to brace with original tapping screws. See Figure 61. Align sleeve bushing and sprockets with right bearing.

  • Page 31: Auger Replacement

    Position reduction shaft as far left as possible and AUGER REPLACEMENT reinstall sleeve bushing and spring clip. See Remove Auger Figure 64. IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool. Disconnect spark plug wire from engine.
  • Page 32 Remove hardware retaining support bushings to auger Remove auger assembly from housing. See housing. See Figure 61. Figure 63. Figure 66 Remove hardware retaining gearcase support Figure 68 brackets to auger housing. See Figure 62. 10. Remove shear bolt from auger shaft. See Figure 64. Figure 69 11.

  • Page 33: Install Auger

    See Figure 66. Reinstall flange bushing and support bushing onto auger end. See Figure 68. 12. Remove auger. Use of penetrating oil or heat may be necessary to remove auger. IMPORTANT: If rust is present on auger shaft, remove with sand paper and wipe clean with oil.
  • Page 34 Secure support brackets to auger housing with original See Figure 72. round head square neck bolts and top locking flange Tighten three hex nuts retaining bearing plate. nuts. See Figure 70. Apply a thin layer of anti-seize to impeller shaft end. 10.

  • Page 35: Auger Gearcase Replacement

    See Figure 74. AUGER GEARCASE REPLACEMENT Remove roll pins retaining impeller to impeller shaft Remove Gearcase Assembly and remove impeller. IMPORTANT: Save all hardware for reinstallation. IMPORTANT: Use of penetrating oil or heat may be Stop engine, remove key and wait for all moving parts necessary to remove impeller.

  • Page 36: Impeller Replacement

    IMPELLER REPLACEMENT Install Impeller See Figure 77. Remove Impeller Apply a thin layer of anti-seize to impeller shaft. IMPORTANT: Save all hardware for reinstallation. Secure impeller to impeller shaft with two roll pins. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool.

  • Page 37: Engine Replacement

    See Figure 79. ENGINE REPLACEMENT Tighten three hex nuts securing bearing plate to Remove Engine housing. IMPORTANT: Save all hardware for reinstallation. Apply a thin layer of anti-seize to impeller shaft end. Stop engine, remove key and wait for all moving parts Reinstall spacer bushing onto impeller shaft.

  • Page 38: Install Engine

    See Figure 81. Install Engine Remove engine mounting hardware. WARNING: AVOID INJURY. Engine is heavy. Remove J-clamp and chute deflector cable from NEVER lift engine without a suitable lifting device engine mount. or adult assistant. Using a suitable lifting device or help from an adult assistant, lift engine and lower onto bolts in frame.
  • Page 39 See Figure 84. 11. Reinstall belt finger and secure with original flat steel washers, locking washers and hex bolts as shown in Reinstall idler spring to traction idler arm. Figure 10. Secure attachment sheave to crankshaft with one 12. Check belt finger clearance: locking washer and hex bolt.

  • Page 40: Traction Drive Cable Replacement

    See Figure 87. TRACTION DRIVE CABLE Disconnect lower traction drive cable from upper REPLACEMENT traction drive cable. Remove Traction Drive Clutch Cable Loosen, but DO NOT remove shoulder bolt retaining IMPORTANT: Save all hardware for reinstallation. cable pulley to cable pulley bracket. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool.

  • Page 41: Install Traction Drive Clutch Cable

    Figure 93 Figure 94 Remove cable. See Figure 90. Install Traction Drive Clutch Cable Align cable with cable pulley and tighten shoulder bolt. Reconnect lower traction clutch cable to upper traction WARNING: AVOID INJURY. Before placing unit clutch cable. in service position, drain fuel from tank and fuel system.

  • Page 42: Dual-Handle Interlock Cam Replacement

    Reinstall upper traction clutch cable to traction clutch DUAL-HANDLE INTERLOCK CAM lever. Secure with one flat steel washer and hairpin. REPLACEMENT See Figure 86. Remove Interlock Cam Return unit to operating position. Adjust traction drive clutch. Refer to Operator’s IMPORTANT: Save all hardware for reinstallation. Manual for adjustment procedure.

  • Page 43: Install Interlock Cams

    Operator’s Manual for test procedure. See Figure 100. IMPORTANT: If dual-handle interlock continues to Position left interlock cam inside interlock bracket and malfunction, see your Ariens dealer. align with left camshaft. Insert camshaft through interlock bracket and into interlock cam.

  • Page 44: Axle Bushing Replacement

    AXLE BUSHING REPLACEMENT Remove Right Axle Bushing IMPORTANT: Save all hardware for reinstallation. Remove Left Axle Bushing IMPORTANT: Save all hardware for reinstallation. WARNING: AVOID INJURY. Before placing unit in service position, drain fuel from tank and fuel WARNING: AVOID INJURY. Before placing unit system.

  • Page 45: Install Right Axle Bushing

    See Figure 99. Install Right Axle Bushing IMPORTANT: Two flat steel washers will fall when short Secure bushing to frame exterior with three tapping axle is removed. screws from inside frame. See Figure 101. Hold differential gear and remove short axle. Remove differential gear.

  • Page 46: Flange Bushing Replacement

    Align differential gear with pinion gear and short axle. FLANGE BUSHING REPLACEMENT Reinstall short axle into differential. See Figure 103. IMPORTANT: Save all hardware for reinstallation. WARNING: AVOID INJURY. Before placing unit in service position, drain fuel from tank and fuel system.

  • Page 47: Install Flange Bushings

    Remove flange bushings from pinion gear. See See Figure 108. Figure 106. Insert pinion shaft end into left side of frame. Position flat steel washer against pinion gear and reinstall spring clip. Figure 111 Install Flange Bushings Install flange bushings into pinion gear. See Figure 107.

  • Page 48: Differential Gear Replacement

    See Figure 110. DIFFERENTIAL GEAR REPLACEMENT IMPORTANT: Two flat steel washers will fall when short Remove Differential Gear axle is removed. IMPORTANT: Save all hardware for reinstallation. Hold differential gear in place and remove short axle. Remove differential. WARNING: AVOID INJURY. Before placing unit in service position, drain fuel from tank and fuel system.

  • Page 49: Chute Gear Replacement

    CHUTE GEAR REPLACEMENT Remove Chute Rotation Gear IMPORTANT: Save all hardware for reinstallation Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool. Disconnect spark plug wire from engine. Position discharge chute facing forward. See Figure 120.

  • Page 50: Install Chute Rotation Gear

    Remove hardware retaining chute rotation gear to pedestal plate and remove gear. See Figure 121. 1. Actuation Gear Figure 120 2. Chute Rotation Gear 3. Lock Arm Install Chute Rotation Gear Figure 121 IMPORTANT: Discharge chute MUST be positioned Secure chute rotation gear to chute pedestal with forward.

  • Page 51: Remove Actuation Gear

    Reinstall chute gear cover and secure with original SCRAPER BLADE REPLACEMENT tapping screw. Remove Scraper Blade Adjust discharge chute. Refer to Operator’s Manual IMPORTANT: Save all hardware for reinstallation. for adjustment procedure. Reconnect spark plug wire. WARNING: AVOID INJURY. Before tipping unit IMPORTANT: Check all adjustments after first use.

  • Page 52: Install Scraper Blade

    Install Scraper Blade HEADLIGHT REPLACEMENT Position scraper blade inside auger housing and align Remove Bulb with holes in housing. IMPORTANT: Save all hardware for reinstallation. Insert seven flat head square neck bolts through Stop engine, remove key and wait for all moving parts scraper blade from inside housing.

  • Page 53: Install Bulb

    Turn bulb one-eighth turn counterclockwise and EFI BATTERY REPLACEMENT remove from headlight bezel. See Figure 130. Models 921053, 921327 Remove Battery IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool. Disconnect spark plug wire from engine.

  • Page 54: Install Battery

    See Figure 134. Secure battery bracket to dash panel with original hardware. Reconnect battery connector to wire harness. Figure 130 Figure 132 Cut cable ties retaining battery to battery bracket. Reinstall ECU and secure to dash panel with original Remove battery and dispose of properly. hardware.

  • Page 55: Replace Engine Control Unit (Ecu)

    REPLACE ENGINE CONTROL UNIT Install ECU Secure ECU to bracket with original hardware. See (ECU) Figure 137. Models 921053, 921327 Secure ECU bracket to dash panel with original Remove ECU hardware. See Figure 135. IMPORTANT: Save all hardware for reinstallation. Reconnect wire harnesses to ECU.

  • Page 56: Gearcase Rebuild

    See Figure 139. GEARCASE REBUILD Remove hardware retaining gearcase cover and Disassemble Gearcase remove cover. IMPORTANT: Save all parts for reassembly, unless Remove gasket and drain gearcase. otherwise specified. Remove gearcase. See Remove Gearcase Assembly on page 31. Remove any rust, if present, from auger and impeller shafts with sandpaper.
  • Page 57 See Figure 141. 10. With a snap ring pliers, remove retaining ring. See Figure 143. Press auger shaft through the right side of gearcase. NOTICE: DO NOT strike auger shaft end; use a press. Remove seal, bushing and washer from auger shaft. Figure 141 See Figure 144.

  • Page 58: Assemble Gearcase

    14. Remove seals and flange bushings from gearcase. Assemble Gearcase See Figure 145. See Figure 146. Press rear seal into gearcase until flush with gearcase exterior. IMPORTANT: DO NOT press right seal into gearcase. Reinstall right and rear flange bushings. Figure 143 1.
  • Page 59 See Figure 148. Reinstall impeller shaft through front of gearcase and reinstall thrust collar onto impeller shaft end. Wrap a seal protector around impeller shaft end and insert shaft through gearcase seal. Remove seal protector. NOTICE: Unprotected seals can be damaged when rough edges in shaft, such as holes, pass through seal.
  • Page 60 10. Reinstall retaining ring. See Figure 151. See Figure 153. 14. Reinstall one flat steel washer and bushing onto right auger shaft end. IMPORTANT: Stepped-down side of bushing MUST be positioned toward gearcase. Figure 149 11. Turn impeller shaft by hand to ensure shaft rotates easily.
  • Page 61 See Figure 155. See Figure 157. 16. Wrap seal protector around each auger shaft end so 21. Reinstall gearcase gasket. holes in shaft are covered. 22. Secure cover to gearcase with four external tooth NOTICE: Unprotected seals can be damaged when locking washer bolts.

  • Page 62: Track Drive Wheel Replacement

    (2.4" – 2.6") from the flat surface of the gearcase IMPORTANT: Save all hardware for reinstallation. cover. IMPORTANT: Ariens recommends using only Ariens L3 WARNING: AVOID INJURY. Before placing unit synthetic severe duty gear lube. Using other lubricants will in service position, drain fuel from tank and fuel not automatically void unit warranty, but the warranty will system.

  • Page 63: Install Track Drive Wheel

    See Figure 161. Model 921052 With assistance from an adult helper, pull rear track axle up so eye bolts insert through tension brackets. Secure with center locking flange nuts and tighten. Model 921057 Figure 159 Return unit to operating position. Reconnect spark plug wire and fill fuel tank.

  • Page 64: Track Replacement

    TRACK REPLACEMENT Install Track See Figure 163. Models 921052, 921057 IMPORTANT: Tracks are directional and MUST be installed Remove Track with treads in the orientation shown in Figure 163. IMPORTANT: Save all hardware for reinstallation. Install track onto carriage assembly and align with bogie wheel(s) and track runner, if equipped.

  • Page 65: Bogie Wheel Replacement

    BOGIE WHEEL REPLACEMENT AXLE BEARING REPLACEMENT (TRACK MODELS) Models 921052, 921057 Remove Bogie Wheel Models 921052, 921057 IMPORTANT: Save all hardware for reinstallation. Remove Left Bearing IMPORTANT: Save all hardware for reinstallation. WARNING: AVOID INJURY. Before placing unit in service position, drain fuel from tank and fuel WARNING: AVOID INJURY.
  • Page 66 See Figure 166. 10. Remove sleeve bushing between bearings on frame and carriage side plate. See Figure 168. Remove axle. IMPORTANT: Model 921052: Be aware of flat steel washer on axle. Figure 164 Figure 166 Loosen, but DO NOT remove hardware securing axle 11.

  • Page 67: Install Left Bearing

    IMPORTANT: RapidTrak model Model 921057 does not Install Left Bearing require track tension adjustments. IMPORTANT: Bearing plates are ONLY installed with IMPORTANT: Check all adjustments after first use. bearing on frame. Bearing plates are NOT installed with bearing on side plate. Secure each bearing to frame and / or side plate with three hex bolts and three locking nuts.

  • Page 68: Remove Right Bearing

    See Figure 173. Remove Right Bearing Loosen, but DO NOT remove hardware securing axle IMPORTANT: Save all hardware for reinstallation. mount plates to carriage side plates. WARNING: AVOID INJURY. Before placing unit IMPORTANT: Loosen mount plates on both sides of unit. in service position, drain fuel from tank and fuel system.

  • Page 69: Install Right Bearing

    See Figure 175. 11. Remove hardware retaining bearing(s) and remove bearing(s). IMPORTANT: Bearing plate is not a wear item and does not need replacement unless damaged. Figure 174 Reinstall long axle into differential gear. See 1. Bearing Figure 177. 2. Bearing Plate Figure 173 Install Right Bearing IMPORTANT: Bearing plates are ONLY installed with...

  • Page 70: Efi Troubleshooting

    EFI TROUBLESHOOTING EFI REPLACEMENT COMPONENTS....69 EFI TROUBLE CODE IDENTIFICATION ... 71 CHECKING TROUBLE CODES ....71 TROUBLE CODE DIAGNOSTICS.

  • Page 71: Efi Replacement Components

    Using unauthorized parts may adversely affect the performance, durability or safety of this unit and may void the warranty. Click the Parts Diagrams by Parts Radar link at www.ariens.com for replacement part numbers of the items listed below: • ECU...
  • Page 72 Fuel Injector Servo Motor Servo-Operated Engine Throttle Plate Temperature Sensor Fuel Pump With Internal Filter Fuel Inlet Fuel Pressure Sensor (Internal) Figure 179 Inline Fuel Filter Throttle Body Assembly* Sealing O-Ring Fuel Pump Figure 178 *Throttle body assembly consists of fuel injector, fuel pressure sensor and servo-operated throttle plate.

  • Page 73: Efi Trouble Code Identification

    EFI TROUBLE CODE IDENTIFICATION CHECKING TROUBLE CODES The blinking red LED light on the ECU displays trouble Trouble Problem Correction codes. Its sequence indicates a particular system Code malfunction by blinking as many times as the first digit of a Low Battery Voltage Check charging trouble code, pausing, and then blinking as many times as system and battery.

  • Page 74: Trouble Code Diagnostics

    TROUBLE CODE DIAGNOSTICS NOTICE: Before performing diagnostic tasks, be aware of the screw on the bottom of the throttle body that adjusts the servo offset. The servo offset calibrates the throttle body at the factory using a flow bench and should NEVER be touched.

  • Page 75: Code 21: Barometer Sensor

    Code 21: Barometer Sensor Code 23: EFI System Cannot Sustain Desired RPM See Figure 176. The ECU reads the RPM through the alternator. If a faulty This trouble code indicates the barometric pressure sensor connection exists, the ECU will not read the RPM correctly. has failed.
  • Page 76 Inline Fuel Filter Center Tab Figure 186 Check fuel pump wiring to ensure it is connected correctly. See Figure 187. Figure 188 Fuel Pump Wires IMPORTANT: Fuel pump voltage MUST be measured within 30 seconds of the ignition switch being turned to the ON position.

  • Page 77: Code 28: High Battery Voltage

    Remove pump from tank. DIAGNOSTICS FOR NON-TROUBLE Reconnect pump wires. CODES Turn the ignition key to the ON position and listen for a IMPORTANT: The following conditions and diagnostic “humming” noise. procedures apply to EFI components only. If fuel pump is silent, replace fuel pump. Engine Starts and Loses Power If voltage is within range and fuel pump is operating If the engine starts and loses power immediately, this is...
  • Page 78 recoil starter handle to check for spark. If no spark is present, replace spark plug. f. Reinstall spark plug and finger tighten. Turn an additional 1/4 turn after spark plug is seated. g. Reinstall spark plug wire and make sure it is correctly positioned onto the spark plug.
  • Page 79 If voltage is within range and the fuel injector is not operating correctly with the key in the ON position, replace throttle body assembly. Figure 193 c. If no voltage is present at the injector, check battery voltage by probing the red and white wires on the 12-pin ECU connector with the red probe and contact the black probe against the engine block.

  • Page 80: Surging Run Condition

    If no voltage is present at the ECU, replace ECU. If voltage With an inline spark tester, check ignition for is present at the ECU, check wires for kinks or damage. If intermittent spark. damage is present repair wires if possible, or replace Check fuel pump output.

  • Page 81: Fluttering Servo Motor

    c. Position the black probe on the engine block. d. Turn ignition key to ON position. e. Turn the potentiometer from low-idle to full throttle. Voltage to the red wire should measure 4.90 V DC – 5.0 V DC at both low-idle and full throttle positions. If voltage measures less than 4.9 V DC, replace ECU.

  • Page 82: Service Record

    SERVICE RECORD DATE SERVICE COMPLETED NOTES EN – 80...
  • Page 83 655 West Ryan Street Brillion, WI 54110 www.ariens.com parts.ariens.com...

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