Nissan Sentra. Manual — part 826
DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
STC-11
< SYSTEM DESCRIPTION >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
*1: Almost in accordance with the value of “MOTOR SIG”. It is not a malfunction though these values are not
accorded when steering quickly.
*2: Normally displays 100%. In case of an excessive stationary steering, the assist curvature gradually falls.
However, it returns to 100% when left standing.
*3: It is not a malfunction, though it might not be corresponding just after ignition switch in turned ON.
STC-12
< ECU DIAGNOSIS INFORMATION >
EPS CONTROL UNIT
ECU DIAGNOSIS INFORMATION
EPS CONTROL UNIT
Reference Value
INFOID:0000000009757429
VALUES ON THE DIAGNOSIS TOOL
The following table includes information (items) inapplicable to this vehicle. For information (items) applicable
to this vehicle, refer to CONSULT display items.
CAUTION:
The output signal indicates the EPS control unit calculation data. The normal values will be displayed
even in the event that the output circuit (harness) is open.
*1: Almost in accordance with the value of “MOTOR SIG”. It is not a malfunction though these values are not
accorded when steering quickly.
*2: A fixed value is indicated regardless of steering turning.
*3: Normally displays 100%. In case of an excessive stationary steering, the assist curvature gradually falls.
However, it returns to 100% when left standing.
*4: It is not a malfunction, though it might not be corresponding just after ignition switch in turned ON.
Monitor item
Data monitor
Condition
Display value
BATTERY VOLT
Ignition switch: ON
Battery voltage
TORQUE SENSOR
Engine running
Steering wheel: Not steering (There is
no steering force)
Approx. 0 Nm
Steering wheel: Right turn
Positive value (Nm)
Steering wheel: Left turn
Negative value (Nm)
MOTOR CURRENT
Engine running
Steering wheel: Not steering (There is
no steering force)
Approx. 0 A
Steering wheel: Right or left turn
Displays consumption current of
EPS motor (A)
*1
MOTOR SIG
Engine running
Steering wheel: Not steering (There is
no steering force)
Approx. 0 A
Steering wheel: Right turn
Positive value (A)
Steering wheel: Left turn
Negative value (A)
ASSIST TORQUE
Engine running
Approx. 0 Nm
*2
C/U TEMP
Ignition switch ON or engine running
Displays temperature of inside of
EPS control unit [
°C (°F)]
ASSIST LEVEL
Engine running
100 %
*3
VEHICLE SPEED
Vehicle stopped
0 km/h (0 mph)
While driving
Approximately equal to the indication
on speedometer
*4
(inside of
±10%)
WARNING LAMP
EPS warning lamp: ON
On
EPS warning lamp: OFF
Off
ENGINE STATUS
Engine not running
Stop
Engine running
Run
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
Fail-Safe
INFOID:0000000009757430
• 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:0000000009757431
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
ALGIA0156ZZ
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
(BR)
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
15
(R)
Ground
Torque sensor ground
—
Always
0 V
16
(Y)
Ground
Torque sensor main
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
(B)
Ground
Torque sensor sub
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)
18
(W)
Ground
Torque sensor power
supply
Output
Ignition switch: ON
5 V
STC-14
< ECU DIAGNOSIS INFORMATION >
EPS CONTROL UNIT
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:0000000009757432
When multiple DTCs are detected simultaneously, check one by one depending on the following priority list.
DTC Index
INFOID:0000000009757433
*: Even if DTC is detected, EPS warning lamp does not turn ON when assist torque is generated.
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
EPS warning lamp
Reference
C1601
BATTERY VOLT
ON
C1604
TORQUE SENSOR
ON
C1606
EPS MOTOR
ON
C1607
EEPROM
OFF
C1608
CONTROL UNIT
ON / OFF
*
C1609
CAN VHCL SPEED
ON
U1000
CAN COMM CIRCUIT
ON
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