Toro 04861, Service Manual

Page: 113 / 234

Testing the Lithium-Ion Battery Controller (continued)
g338794
Figure 56
1. Lithium-Ion battery controller 5. B- terminal
2. Positive (+) terminal 6. Negative (–) terminal
3. B+ terminal 7. COM terminal
4. M-S terminal
Although there is no method to test the solid state circuitry built into the controller
directly, some aspects of the lithium-ion battery controller operation can be tested
as follows; refer to
Figure 55 .
1. With the battery connected to the BMS, the battery pack voltage can be
tested across the BMS B+ and B- terminals.
2. With the battery connected to the BMS, signal voltage from the BMS to the
key switch can be tested at the controller wire harness connector pin 6 and
the BMS B- terminal.
3. An audible “Click” should come from the BMS shortly after the key switch is
set to the ON position. The “Click” sound indicates the contactor inside the
BMS has closed and battery power should be available to the machine.
4. Once the BMS internal contactor has closed, battery pack voltage can be
tested across the BMS positive (+) and negative (–) terminals.
5. If CAN bus communication with the controller is suspect, the CAN bus wiring
should be checked for corrosion or damage and cleaned or repaired as
necessary. The lithium-ion battery controller CAN bus transceiver can also
be tested, if necessary, by using the controller wire harness connector pins 3
and 4, the normal resistance must be 50k to 55k ohms.
Greensmaster ® eFlex 1021 Page 5–29 Electrical System: Testing the Electrical Components
20248SL Rev C