Electrical Troubleshooting
Troubleshooting
Page 15
Test 5. CONTACTOR COIL FAULT
Disconnect the 12-pin logic card connector from the Sevcon power unit.
Turn the key switch ON and perform the following tests:
TEST 5.1:
Check the voltage on the positive coil terminal of the
ISO solenoid (violet wire).
If the voltage is within approximately 1-volt of the
battery voltage, then skip ahead to test #5.2.
If the voltage is not within approximately 1-volt
of the battery voltage, then check the diode in
the positive wire to the ISO solenoid.
Stop trouble shooting here and repair the problem.
When the repair is completed, completely retest the
vehicle before lowering the drive wheels to the
ground.
TEST 5.2:
Check the voltage on the negative coil terminal of the
contactor coil.
If the voltage is not within 1-volt of battery voltage,
then the contactor is bad and must be replaced.
NOTE: An open contactor coil should be
accompanied by a 4-flash code from
the logic LED.
If the voltage is within 1-volt, then one of the four
following faults may have occurred:
Broken Wire: Check the wire from pin #8 in
the 12-pin logic card connector to the
contactor coil negative terminal for open
circuits.
Welded Solenoid Contacts: Test the solenoid for welded contact tips. There are two
methods for checking the contacts:
1. Disconnect the batteries and test the continuity across the contacts. If there
is continuity then the contact tips are welded.
2. With the key switch OFF, check the voltage at the B+ terminal on the Sevcon
control (see illustration on following page). If the voltage at the B+ terminal
is at full battery voltage then the contact tips are welded.
NOTE: Welded tips should be accompanied by a 4-flash code from the
logic LED.
Summary of Contents for C0-425-36
Page 2: ......
Page 10: ...TAYLOR DUNN...
Page 18: ...TAYLOR DUNN...
Page 73: ...Maintenance Service and Repair Steering Page 19 Exploded View of Steering Gear...
Page 74: ...TAYLOR DUNN...
Page 98: ...TAYLOR DUNN...
Page 99: ...TABLE OF CONTENTS Throttle Linkage Adjustments 2 Throttle Linkage...
Page 132: ...TAYLOR DUNN...
Page 142: ...TAYLOR DUNN...
Page 154: ...TAYLOR DUNN...
Page 182: ...TAYLOR DUNN...
Page 183: ...TABLE OF CONTENTS Wire Diagrams Dash 2 Control Panel 3...
Page 186: ...TAYLOR DUNN...
Page 194: ...Illustrated Parts Illustrated Parts Page 8 Front Suspension...
Page 196: ...Illustrated Parts Illustrated Parts Page 10 Transmission Assembly 5 7 6 8 9...
Page 198: ...Illustrated Parts Illustrated Parts Page 12 Transmission Gear Case...
Page 200: ...Illustrated Parts Illustrated Parts Page 14 Transmission Differential Case Rear Axle...
Page 202: ...Illustrated Parts Illustrated Parts Page 16 Rear Brakes Brake Body Assembly...
Page 204: ...Illustrated Parts Illustrated Parts Page 18 Rear Suspension 12 FRONT 11 1 5 4 2 17 6 Frame 7 7...
Page 206: ...Illustrated Parts Illustrated Parts Page 20 Motor Master Cylinder 13...
Page 208: ...Illustrated Parts Illustrated Parts Page 22 Automatic Electric Brake...
Page 220: ...Illustrated Parts Illustrated Parts Page 34 Instrument Panel dash 2 Smart View Display...
Page 226: ...Illustrated Parts Illustrated Parts Page 40 Lighting System...
Page 228: ...Illustrated Parts Illustrated Parts Page 42 Seat Cushions and Deck...
Page 230: ...Illustrated Parts Illustrated Parts Page 44 Decals...
Page 237: ...APPENDIX A Special Tools...
Page 239: ...APPENDIX B Torque Values...
Page 242: ...TAYLOR DUNN...
Page 243: ...Appendix C...
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