Nissan Leaf. Manual — part 1142
EPS CONTROL UNIT
STC-13
< ECU DIAGNOSIS INFORMATION >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
TERMINAL LAYOUT
PHYSICAL VALUES
ALGIA0178ZZ
Terminal No.
(Wire Color)
Description
Condition
Value
(Approx.)
+
−
Signal name
Input/Output
1
(P)
—
CAN-L
Input/Output
—
—
2
(L)
—
CAN-H
Input/Output
—
—
4
(W)
Ground
Ignition power supply
Input
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
9
(R)
Ground
Battery power supply
Input
Always
Battery voltage
10
(B)
Ground
Ground
—
Always
0 V
11
(B)
Ground
Torque sensor ground
Input
Always
0 V
12
(Y)
Ground
Torque sub sensor
signal
Input
Ignition switch: ON
Steering wheel: Not
steering (There is no
steering force)
2.5 V
Engine running
Steering wheel: steer-
ing
1.6 V – 3.4 V
(The value is changed
according to steering
left or right)
14
(R)
Ground
Torque sensor power
supply
Output
Ignition switch: ON
10 V
15
(G)
Ground
Torque main sensor
signal
Input
Ignition switch: ON
Steering wheel: Not
steering (There is no
steering force)
2.5 V
Engine running
Steering wheel: steer-
ing
1.6 V – 3.4 V
(The value is changed
according to steering
left or right)
17
(W)
Ground
Torque sensor refer-
ence voltage
Output
Ignition switch: ON
3.3 V
19
(G)
Ground
Reference signal R2
Input
Ignition switch: ON
Steering wheel: Not
steering (There is no
steering force)
—
Engine running
Steering wheel: steer-
ing
—
22
(W)
Ground
Reference signal R1
Input
Ignition switch: ON
Steering wheel: Not
steering (There is no
steering force)
—
Engine running
Steering wheel: steer-
ing
—
STC-14
< ECU DIAGNOSIS INFORMATION >
EPS CONTROL UNIT
Fail-Safe
INFOID:0000000010119188
• If any malfunction occurs in the system and control unit detects the malfunction, EPS warning lamp on com-
bination meter turns ON to indicate system malfunction.
• When EPS warning lamp is ON, the system enters into a manual steering state. (Control turning force steer-
ing wheel becomes heavy.)
• Under abnormal vehicle speed signal conditions, vehicle speed is judged as constant.
Protection Function
INFOID:0000000010119189
EPS control unit decreases the output signal to EPS motor while extremely using the power steering function
(e.g., full steering) consecutively for protecting EPS motor and EPS control unit (Overload protection control).
While activating overload protection control, the assist torque gradually decreases, and the steering wheel
turning force becomes heavy. The normal assist torque is recovered if the steering wheel is not turned for a
while.
DTC Inspection Priority Chart
INFOID:0000000010119190
When multiple DTCs are detected simultaneously, check one by one depending on the following priority list.
DTC Index
INFOID:0000000010119191
23
(Y)
Ground
Reference signal S2
(Sine 1)
Input
Ignition switch: ON
Steering wheel: Not
steering (There is no
steering force)
—
Engine running
Steering wheel: steer-
ing
—
24
(L)
Ground
Reference signal S4
(Sine 2)
Input
Ignition switch: ON
Steering wheel: Not
steering (There is no
steering force)
—
Engine running
Steering wheel: steer-
ing
—
25
(B)
Ground
Reference signal S3
(Cosine 1)
Input
Ignition switch: ON
Steering wheel: Not
steering (There is no
steering force)
—
Engine running
Steering wheel: steer-
ing
—
26
(R)
Ground
Reference signal S1
(Cosine 2)
Input
Ignition switch: ON
Steering wheel: Not
steering (There is no
steering force)
—
Engine running
Steering wheel: steer-
ing
—
Terminal No.
(Wire Color)
Description
Condition
Value
(Approx.)
+
−
Signal name
Input/Output
Priority
Priority order item (DTC)
1
U1000 CAN COMM CIRCUIT
2
C1609 CAN VHCL SPEED
3
C1601 BATTERY VOLT
4
Other than the above
DTC
Items (CONSULT screen terms)
Reference
C1601
BATTERY VOLT
C1604
TORQUE SENSOR
C1606
EPS MOTOR
EPS CONTROL UNIT
STC-15
< ECU DIAGNOSIS INFORMATION >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
NOTE:
If some DTCs are displayed at the same time, refer to
STC-14, "DTC Inspection Priority Chart"
.
C1607
EEPROM
C1608
CONTROL UNIT
C1609
CAN VHCL SPEED
U1000
CAN COMM CIRCUIT
DTC
Items (CONSULT screen terms)
Reference
STC-16
< WIRING DIAGRAM >
ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM
WIRING DIAGRAM
ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM
Wiring Diagram
INFOID:0000000010119192
AAGWA0053GB
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