Nissan Leaf. Manual — part 505
EVC-44
< SYSTEM DESCRIPTION >
SYSTEM
EV SYSTEM START UP CONTROL
EV SYSTEM START UP CONTROL : System Description
INFOID:0000000010120555
SYSTEM DIAGRAM
CONTROL DESCRIPTION
VCM judges the operation mode from signals sent by various sensors, switches, and ECUs, and controls the
start/stop of the EV system by activating the relays accordingly.
P31B5
TYPE 1
ASCD operation prohibited
NOTE:
The ECO indicator value also becomes extremely poor.
TYPE 2
No fail-safe.
P31B6
VCM sets the DC/DC converter output power to a constant 14 V.
P31C5
• VCM inhibits the timer charge and the remote climate control.
• VCM inhibits the automatic 12V battery charge control.
P31C6
• VCM inhibits the timer charge and the remote climate control.
• VCM inhibits the automatic 12V battery charge control.
P31C7
• VCM inhibits the timer charge and the remote climate control.
• VCM inhibits the automatic 12V battery charge control.
P31CA
×
Traction motor output is limited.
P31CB
×
Traction motor output is limited.
P31D5
• Traction motor output is limited.
• Vehicle speed is limited. [Approx. 40 km/h (25 MPH)]
P31DB
×
×
×
×
P31DC
×
×
×
×
P31DE
TYPE 1
Traction motor output is limited.
TYPE 2
×
×
×
×
Start not possible
P31E0
TYPE 1
×
×
×
×
TYPE 2
No fail-safe.
P31E1
TYPE 1
×
×
×
×
TYPE 2
No fail-safe.
P31E7
Doing READY again is prohibited.
P31F2
VCM inhibits the timer charge and the remote climate control.
DTC
Pattern
Others
A
B
C
D
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SYSTEM
EVC-45
< SYSTEM DESCRIPTION >
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Power Switch ON
When the power ON power supply from the IPDM E/R enters VCM, VCM turns ON the M/C relay to supply
power to each ECU in the EV system.
READY
When the driver operates the POWER switch while depressing the brake pedal, VCM turns ON the M/C relay
to supply power to each ECU in the EV system. Furthermore, VCM activates the F/S relay to start the power
supply to the system main relay.
NOTE:
VCM inhibits the vehicle is set to READY in following conditions:
• Charge connector is connected
• Li-ion battery remaining energy is too low.
• Li-ion battery temperature is too low. [Approximately -25
°C (-13°F)]
In Normal Charging
If VCM judges that the system is in normal charge mode, VCM turns ON the M/C relay to supply power to
each ECU in the EV system. Furthermore, VCM activates the F/S relay to start the power supply to the system
main relay.
NOTE:
Normal charging does not start with the power switch ON.
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EVC-46
< SYSTEM DESCRIPTION >
SYSTEM
In Quick Charging
When VCM judges that the system is in quick charge mode, VCM turns ON the M/C relay to supply power to
each ECU in the EV system. VCM also activates the F/S CHG relay to supply power to the quick charge relay
inside PDM (Power Delivery Module). Furthermore, VCM activates the F/S relay to start the power supply to
the system main relay.
When Air Conditioner Is Operating (Power OFF)
When air conditioner is activated (e.g. remote climate control and Climate Ctrl. Timer), VCM turns ON the M/C
relay to start the EV system. VCM also activates the A/C relay to supply power to the air conditioner system.
Furthermore, VCM activates the F/S relay to start the power supply to the system main relay.
When Automatic 12V Battery Charge Control is Operating
When VCM judges that the 12V battery requires automatic charging, VCM turns ON the M/C relay to start the
EV system. Furthermore, VCM activates the F/S relay to start the power supply to the system main relay.
Relay Activation Matrix
POWER ON
POWER OFF
*: Only during quick charging
HIGH VOLTAGE POWER SUPPLY CONTROL
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Relay
Condition
POWER ON
READY
Charging
When 12V bat-
tery is charged
Climate Ctrl.
Timer
Normal charge
Quick charge
F/S relay
ON
ON
ON
ON
ON
ON
M/C relay
ON
ON
ON
ON
ON
ON
A/C relay
ON
ON
ON
ON
ON
ON
F/S CHG relay
OFF
OFF
OFF
ON
OFF
OFF
Relay
Condition
Charging
When 12V battery
is charged
Climate Ctrl. Timer
Remote cli-
mate control
Normal charge
Quick charge
F/S relay
ON
ON
ON
ON
ON
M/C relay
ON
ON
ON
ON
ON
A/C relay
OFF
OFF
OFF
ON
ON
F/S CHG relay
OFF
ON
OFF
OFF
ON
*
SYSTEM
EVC-47
< SYSTEM DESCRIPTION >
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HIGH VOLTAGE POWER SUPPLY CONTROL : System Description
INFOID:0000000010120556
SYSTEM DIAGRAM
DESCRIPTION
When the driver performs the READY operation or connects the charge cable to a charging port or when VCM
starts according to the timer control and judges the necessity of connecting the high voltage circuit to Li-ion
battery, VCM activates system main relay 1, system main relay 2, and the pre-charge relay located inside the
Li-ion battery to establish the circuit.
Moreover, the high voltage circuit of the EV system has a pre-charge circuit to protect the high voltage circuit
from sudden application of high voltage current.
CONTROL FLOW
To connect the high voltage circuit, VCM first activates the system main relay 2 and pre-charge relay.
As a result, the high voltage power is supplied to the respective systems via the pre-charge resistor in the pre-
charge circuit. When the condenser inside the traction motor inverter is fully charged by the applied power, the
traction motor inverter transmits a high voltage power supply preparation completion signal to VCM. Receiving
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