Taylor-Dunn B0-248-36, Operation, T Roubleshooting And Replacement Parts Manual

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Sevcon Troubleshooting
Page 6
Electrical Troubleshooting
TEST 1.5:
Test the voltage at pin #4 on the 12-pin logic card
connector.
If the voltage is high, then skip ahead to Test
#1.6.
If the voltage is low, then skip ahead to Test
#6.
TEST 1.6:
Test the voltage at pin #7 on the 12-pin logic card
connector.
NOTE: Pin #7 is for a parking brake interlock switch.
This switch is not available for all vehicles
and may not be used.
If the voltage is high, then skip ahead to Test
#1.7.
If the voltage is low, then:
•
Check the park brake switch for shorted
contacts.
•
Check the wire to the park brake switch for
short circuits to B-.
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 1.7:
Depress the accelerator pedal to engage FS-1 only
(creep speed).
Perform the following tests:
Test the voltage at pin #10 on the 12-pin logic card
connector.
If the voltage is below 0.3 volts, then skip
ahead to Test #1.8.
If the voltage is above 0.3 volts, then skip
ahead to Test #6
This troubleshooting guide is written in
sequential order. All tests must be performed in
the order that they are written. Starting in the
middle or skipping sections when not instructed
to do so may lead to invalid test results.
TEST 1.8:
Test the voltage at pin #4 on the 12-pin logic card
connector.
If the voltage is low, then skip ahead to Test
#1.9.
If the voltage is high, then skip ahead to Test
#6.
TEST 1.9:
Depress the accelerator pedal fully.
Test the voltage at pin #10 on the 12-pin logic card
connector.
If the voltage is between 4.8 and 5.1 volts,
then skip ahead to Test #2.
If the voltage is
not between 4.8 and 5.1 volts,
then skip ahead to Test #6.