Nissan Altima HL32 Hybrid. Manual — part 1068
![](/vehicles/gon/sttello/nita/thindovea.png)
EPS CONTROL UNIT
STC-51
< ECU DIAGNOSIS >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
NOTE:
While stopping or driving, EPS control unit decreases the output to EPS motor while extremely using the
power steering function (e.g., full steering) for protecting EPS motor and EPS control unit (Protect overload
status). While activating protect overload status, the assist torque gradually decreases, and the steering wheel
turning force becomes heavy. The normal assist torque reactivates by not steering for approximately 10 min-
utes in READY mode state.
DTC Inspection Priority Chart
INFOID:0000000004212884
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
DTC Index
INFOID:0000000004212885
Warn-
ing
lamp
DTC
Malfunction item
Fail-safe
ON
C1601
Battery power supply
Power assistance stops
ON
C1604
Torque sensor
ON
C1606
EPS motor
ON
C1607
EPS control unit memory (EEPROM) system
EPS motor angle sensor initialization and torque sensor cali-
bration data are set to the default values.
ON
C1608
EPS control unit
When temperature sensor in EPS
control unit is open or short
Power assistance continues at certain temperature
Other than the above
Power assistance stops
ON
C1609
Vehicle speed signal
Amount of power assistance is fixed for a speed of 100 km/h
(62 MPH).
ON
C1613
Torque sensor calibration not performed
—
ON
C16A0 HV ECU
Power assistance stops
ON
C16A1 EPS DC/DC converter
ON
C16A2 EPS motor angle sensor initialization not performed
—
ON
U0129
Lost communication with brake ECU
Amount of power assistance is fixed for a speed of 100 km/h
(62 MPH).
ON
U0293
Lost communication with HV ECU
Power assistance stops
Priority
Detected items (DTC)
1
• U0129 LOST COMM (BRAKE)
• U0293 LOST COMM (HV ECU)
2
• C1613 TQ SE CLB NOT PFRM
• C16A2 ANG SE INT NOT PFM
3
• C1601 BATTERY VOLT
• C1609 VHCL SPEED SIGNAL
• C16A0 HV ECU
• C16A1 EPS DCDC CONVERTER
4
• C1604 TORQUE SENSOR
• C1606 EPS MOTOR
• C1607 EEPROM
• C1608 CONTROL UNIT
DTC
Items
(CONSULT-III screen terms)
Reference
C1601
BATTERY VOLT
C1604
TORQUE SENSOR
C1606
EPS MOTOR
![](/vehicles/gon/sttello/nita/myb.png)
STC-52
< ECU DIAGNOSIS >
EPS CONTROL UNIT
C1607
EEPROM
C1608
CONTROL UNIT
C1609
VHCL SPEED SIGNAL
C1613
TQ SE CLB NOT PFRM
C16A0
HV ECU
C16A1
EPS DCDC CONVERTER
C16A2
ANG SE INT NOT PFM
U0129
LOST COMM (BRAKE)
U0293
LOST COMM (HV ECU)
DTC
Items
(CONSULT-III screen terms)
Reference
![](/vehicles/gon/sttello/nita/knd.png)
EPS SYSTEM SYMPTOMS
STC-53
< SYMPTOM DIAGNOSIS >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
SYMPTOM DIAGNOSIS
EPS SYSTEM SYMPTOMS
Symptom Table
INFOID:0000000004212886
If EPS warning lamp turns ON, perform self-diagnosis.
Symptom
Condition
Check item
Reference
Steering wheel turning force is/was
heavy
• While stopping or
driving
• Steering wheel turn-
ing
Front tires (Tire pressure, wear condition)
Front wheel alignment
FSU-6, "Inspec-
tion and Adjust-
ment"
Front suspension (Ball joint)
FSU-11, "Re-
moval and Instal-
lation"
Steering gear assembly (Torque sensor, EPS mo-
tor, EPS motor angle sensor)
Steering column assembly
Battery and power supply circuit
Power supply for EPS control unit
Harness and connector (Between EPS control unit
and EPS DC/DC converter)
STC-33, "Diag-
nosis Procedure"
EPS control unit
Vehicle condition (Steering wheel is turned from left
to right repeatedly while vehicle stopped or heavy
load is continuously applied to the vehicle)
STC-10, "CON-
SULT-III Func-
tion (EPS)"
Steering wheel turning force is differ-
ent between right and left, or uneven
(torque variation)
• While stopping or
driving
• Steering wheel turn-
ing
EPS motor angle sensor initialization and torque
sensor calibration
Front tires (Tire pressure, wear condition)
Front wheel alignment
FSU-6, "Inspec-
tion and Adjust-
ment"
Front suspension (Ball joint)
FSU-11, "Re-
moval and Instal-
lation"
Steering gear assembly (Torque sensor, EPS mo-
tor, EPS motor angle sensor)
Steering column assembly
EPS control unit
![](/vehicles/gon/sttello/nita/pal.png)
STC-54
< SYMPTOM DIAGNOSIS >
EPS SYSTEM SYMPTOMS
Steering wheel turning force does
not change according to vehicle
speed, or steering wheel does not
return smoothly
• While driving
• Steering wheel turn-
ing
Front suspension (Ball joint)
FSU-11, "Re-
moval and Instal-
lation"
Wheel sensor
Brake ECU
Steering gear assembly (Torque sensor, EPS mo-
tor, EPS motor angle sensor)
EPS control unit
CAN communication line
LAN-16, "Trou-
ble Diagnosis
Flow Chart"
Scratch sound occur when turning
the steering wheel
• While driving (Low
speed)
• Steering wheel turn-
ing
Steering gear assembly (EPS motor)
Steering column assembly
Shrill sound (squeaking) occur when
turning the steering wheel
• While stopped
• Steering wheel turn-
ing (Slowly)
Steering gear assembly (EPS motor)
Steering wheel vibrates and noise
when turning the steering wheel
from left to right
• While stopped
• Steering wheel turn-
ing
Steering gear assembly (EPS motor)
Steering column assembly
EPS warning lamp does not turn
OFF several seconds after READY
mode
READY mode state
CAN communication line
STC-41, "Diag-
nosis Procedure"
Ignition power supply circuit
Combination meter
EPS control unit
Symptom
Condition
Check item
Reference
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