TROUBLESHOOTING (YUM2E)
9-6
TROUBLESHOOTING (YUM2E)
GENERAL INFORMATION
TIP
The following guide for troubleshooting does not
cover all the possible causes of trouble. It should
be helpful, however, as a guide to basic trouble-
shooting. Refer to the relative procedure in this
manual for checks, adjustments, and replace-
ment of parts.
POOR PERFORMANCE
Traction motor
1. Traction motor
• Out of round armature
• Broken or shorted armature coil
Electrical system
1. Battery
• Discharged battery
• Faulty battery
2. Fuse(s)
• Blown, damaged or incorrect fuse
• Improperly installed fuse
3. Switches and wiring
• Faulty main switch
• Broken or shorted wiring
• Faulty shift switch
• Faulty tow switch
• Improperly grounded circuit
• Loose connections
4. Motor control system
• Faulty MCU
• Faulty main relay
POOR BRAKING PERFORMANCE
• Worn brake shoe
• Worn or rusty brake drum
• Incorrect brake pedal free play
• Incorrect brake shoe adjuster position
• Incorrect brake shoe position
• Damaged or fatigued brake shoe spring
• Oil or grease on the brake shoe
• Oil or grease on the brake drum
FAULTY SHOCK ABSORBER ASSEMBLY
Malfunction
• Fatigued or damaged shock absorber spring
• Bent or damaged damper rod
• Leaking oil
UNSTABLE HANDLING
1. Steering wheel
• Bent or improperly installed steering wheel
2. Steering components
• Incorrect toe-in
• Bent steering shaft
• Improperly installed steering shaft
• Damaged bearing
• Bent tie-rods
• Deformed steering knuckles
3. Shock absorber assembly(-ies)
• Faulty shock absorber spring
• Leaking oil
4. Tire(s)
• Uneven tire pressures (left and right)
• Incorrect tire pressure
• Uneven tire wear
5. Wheel(s)
• Damaged wheel bearing
• Bent or loose wheel axle
• Excessive wheel runout
6. Frame
• Bent frame
• Damaged frame
FAULTY LIGHTING SYSTEM
Headlight does not come on
• Faulty headlight
• Too many electrical accessories
• Hard charging
• Incorrect connection
• Improperly grounded circuit
• Poor contacts (light switch)
RESETTING MOTOR CONTROL UNIT (MCU)
(YUM2E)
Before performing any tests in this section, it is
advisable to reset the motor control unit and
again verify the problem still exists.
1. Turn the main switch “OFF”.
2. Move tow switch to the “TOW” position.
3. Wait 30 seconds and turn the main switch
“ON”.
4. Turn tow switch to the “RUN” position.
If this procedure corrects the problem, there are
two potential causes for this condition:
a. The user operated the tow switch without
allowing the system to reset.
Summary of Contents for UMAX
Page 1: ...SERVICE MANUAL UTILITY VEHICLE J0F F8197 E1 YUM1A YUM2A YUM2E LIT 19616 A0 37...
Page 2: ......
Page 6: ......
Page 8: ......
Page 25: ...GENERAL SPECIFICATIONS 2 2 1174 kg 2589 lb YUM2E Hill claiming ability 20 YUM1A 15 YUM2A YUM2E...
Page 33: ...ELECTRICAL SPECIFICATIONS YUM1A YUM2A 2 10 USB fuse 5 A...
Page 43: ...TIGHTENING TORQUES 2 20...
Page 46: ...CABLE ROUTING 2 23 YUM1A Front and rear A B C 1 1 1 1 2 3 4 3 4 1 2 3 4 5 6...
Page 48: ...CABLE ROUTING 2 25 YUM1A Left side A B D C 1 2 3 4 4 4 4 5 6 7 8 9...
Page 50: ...CABLE ROUTING 2 27 YUM1A Brake and throttle cables A B 1 3 2 3 1 2 2 4 5...
Page 52: ...CABLE ROUTING 2 29 YUM1A Shift cables 1 2 3 1 2 4 1 2...
Page 56: ...CABLE ROUTING 2 33 YUM2A Front and rear A B C D 1 1 1 1 1 2 2 3 3 4 4 3 4 5 6 7...
Page 58: ...CABLE ROUTING 2 35 YUM2A Left side A B C D 1 2 3 4 4 4 4 6 7 8 9 10 5...
Page 60: ...CABLE ROUTING 2 37 YUM2A Brake throttle and shift cables A A B C D 1 1 2 3 3 4 5 4 5 6 6 7 8 9...
Page 62: ...CABLE ROUTING 2 39 YUM2E Frame top view A A B 1 2 3 4 5 6 7 C D E E 6 6 6 8 9 10 11 12...
Page 64: ...CABLE ROUTING 2 41 YUM2E Front and rear 1 1 2 3 4 3 A...
Page 66: ...CABLE ROUTING 2 43 YUM2E Left side B 2 1 3 4 5 6 7 8 9 10 11 A 9...
Page 68: ...CABLE ROUTING 2 45 YUM2E Brake cable A A B C 1 2 4 3...
Page 70: ...CABLE ROUTING 2 47...
Page 73: ......
Page 96: ...4 YEAR CHECKS 3 23...
Page 99: ......
Page 134: ...FRONT SUSPENSION COMPONENTS 4 35 4 3 1 2 5 a...
Page 138: ...REAR SUSPENSION COMPONENTS 4 39...
Page 174: ...CRANKSHAFT AND PISTON 5 35...
Page 196: ...TRANSMISSION YUM1A YUM2A 7 13 Refer to CHECKING THE SHIFT LEVER YUM1A YUM2A on page 3 8...
Page 202: ...TRACTION MOTOR YUM2E 7 19...
Page 205: ......
Page 217: ...CHARGING SYSTEM YUM1A YUM2A 8 12...
Page 223: ...LIGHTING SYSTEM YUM1A YUM2A 8 18...
Page 227: ...LIGHTING SYSTEM YUM2E 8 22...
Page 233: ...SIGNALING SYSTEM YUM1A YUM2A 8 28...
Page 243: ...FUEL INJECTION SYSTEM YUM1A YUM2A 8 38...
Page 247: ...FUEL PUMP SYSTEM YUM1A YUM2A 8 42...
Page 284: ...ELECTRICAL COMPONENTS YUM2E 8 79...
Page 313: ...PC GENIUS GOLF CAR PROGRAMMING SYSTEM YUM2E 9 28...
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