2014 NISSAN TEANA power steering

C160A HEAT PROTECTIONSTC-29
< DTC/CIRCUIT DIAGNOSIS >
C
D E
F
H I
J
K L
M A
B
STC
N
O P
C160A HEAT PROTECTION
DTC LogicINFOID:0000000009460366
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.DTC REPRODUCTION PROCEDURE
With CONSULT
1. Turn the ignition switch OFF to ON.
2. Perform “EPS” self-diagnosis.
Is DTC
“C160A” detected?
YES >> Go to STC-19, "Work Flow".
NO >> Inspection End.
DTC Display item Malfunction detected condition Possible cause
C160A HEAT PROTECTION When the steering wheel is operated excessively
and the interior temperature of the power steering
system reaches 118 °C (244.4 °F) or more. (Protec-
tion function)
NOTE:
Although the hydraulic pump electric power steering
system warning lamp turns ON, this is not a system
malfunction. The state returns to normal after stop-
ping steering operation and waiting until the system
interior temperature drops to 90 °C (194 °F) or less. The protection of the hydraulic
pump electric power steering sys-
tem
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

STC-30
< DTC/CIRCUIT DIAGNOSIS >
U1000 CAN COMM CIRCUIT
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000009460367
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication s peed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CA N communication, control units are connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit communicate data but selectively reads required data only.
DTC LogicINFOID:0000000009460368
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.DTC REPRODUCTION PROCEDURE
With CONSULT
1. Turn the ignition switch OFF to ON.
2. Perform “EPS” self-diagnosis.
Is DTC
“U1000” detected?
YES >> Go to STC-30, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000009460369
Proceed to LAN-32, "CAN COMMUNICATION SYSTEM : CAN Communication Signal Chart".
DTC Display item Malfunction detected condition Possible cause
U1000 CAN COMM CIRCUIT Power steering control module is not transmitting/re-
ceiving CAN communication signal for 2 seconds or
more. CAN communication error
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP
STC-31
< DTC/CIRCUIT DIAGNOSIS >
C
D E
F
H I
J
K L
M A
B
STC
N
O P
HYDRAULIC PUMP ELECTRIC PO WER STEERING WARNING LAMP
Component Function CheckINFOID:0000000009460370
1.CHECK THE ILLUMINATION OF THE HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING
LAMP
Check that the hydraulic pump electric power steering warning lamp turns ON when ignition switch turns ON.
Then, hydraulic pump electric power steering warn ing lamp turns OFF after the engine is started.
Is the inspection result normal?
YES >> Inspection End.
NO >> Perform trouble diagnosis. Refer to STC-31, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000009460371
1.PERFORM SELF-DIAGNOSIS
With CONSULT
1. Turn the ignition switch OFF to ON.
2. Perform “EPS” self-diagnosis.
Is any DTC detected?
YES >> Check the DTC. Refer to STC-13, "DTC Index".
NO >> GO TO 2.
2.CHECK HYDRAULIC PUMP ELECTRIC PO WER STEERING WARNING LAMP SIGNAL
With CONSULT
1. Turn the ignition switch ON.
2. Select “WARNING LAMP” in “DATA MONITOR” of “EPS”.
3. Check that the item in “DATA MONITOR” is “On”. CAUTION:
The engine should not be running for step 3.
4. Start the engine. CAUTION:
Never drive the vehicle during the test.
5. Check that the item in “DATA MONITOR” is “Off”.
Is the inspection result normal?
YES >> Perform the trouble diagnosis for combinat ion meter power supply circuit. Refer to MWI-58,
"COMBINATION METER : Diagnosis Procedure".
NO >> GO TO 3.
3.CHECK TERMINALS AND HARNESS CONNECTORS
Check the power steering control module pin terminal s for damage or loose connection with harness connec-
tor.
Is the inspection result normal?
YES >> Power steering control module is malfuncti oning. Replace power steering oil pump assembly.
Refer to ST-38, "Removal and Installation"
.
NO >> Repair or replace the malfunctioning component.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

STC-32
< SYMPTOM DIAGNOSIS >
HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP DOES NOT TURN ON
SYMPTOM DIAGNOSIS
HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP
DOES NOT TURN ON
DescriptionINFOID:0000000009460372
The hydraulic pump electric power steering warning lamp does not illuminate when the ignition switch is
turned ON (lamp check).
Diagnosis ProcedureINFOID:0000000009460373
1.CHECK THE HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP
Perform trouble diagnosis for the hydraulic pump electric power steering warning lamp system. Refer to STC-
31, "Diagnosis Procedure".
Is the inspection result normal?
YES >> Check that the pin terminals and t he connection of each connector are normal.
NO >> Repair or replace the malfunctioning components.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP DOES
NOT TURN OFF
STC-33
< SYMPTOM DIAGNOSIS >
C
D E
F
H I
J
K L
M A
B
STC
N
O P
HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP
DOES NOT TURN OFF
DescriptionINFOID:0000000009460374
Hydraulic pump electric power steering warning lamp does not turn OFF several seconds after engine started
Diagnosis ProcedureINFOID:0000000009460375
1.PERFORM SELF-DIAGNOSIS
With CONSULT
Perform “EPS” self-diagnosis.
Is any DTC detected?
YES >> Check the DTC. Refer to STC-13, "DTC Index".
NO >> GO TO 2.
2.CHECK HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP
Perform the trouble diagnosis of hydraulic pump el ectric power steering warning lamp. Refer to STC-31,
"Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace the malfunctioning components.
3.POWER STEERING CONT ROL MODULE POWER SUPPLY AND GROUND CIRCUIT
Perform the trouble diagnosis of power steering control module power supply and ground. Refer to STC-23,
"Diagnosis Procedure".
Is the inspection result normal?
YES >> Check that the pin terminals and t he connection of each connector are normal.
NO >> Repair or replace the malfunctioning components.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

STC-34
< SYMPTOM DIAGNOSIS >
STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHT
STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHT
Diagnosis ProcedureINFOID:0000000009460376
1.PERFORM SELF-DIAGNOSIS
With CONSULT
Perform “EPS” self-diagnosis.
Is a malfunctioning system displayed?
YES >> Check malfunctioning system. Refer to STC-13, "DTC Index".
NO >> GO TO 2.
2.CHECK THE POWER STEERING CONTROL MODULE SIGNAL (1)
With CONSULT
1. Start the engine. CAUTION:
Never drive the vehicle.
2. Turn the steering wheel until it stops.
3. Select “MTR ASSIST” in “DATA MONITOR” of “EPS”.
Is the display value
“100%”?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK THE POWER STEERING CONTROL MODULE SIGNAL (2)
With CONSULT
1. Select “C/U TEMP” and “C/U TEMP A” in “DATA MONITOR” of “EPS”.
2. Stop the system until the DATA MONITOR display value drops to “90 °C (194 °F)” or less.
3. Check whether symptom continues.
Did symptom continue?
YES >> GO TO 4.
NO >> This occurs because the protection function lowers the assist force. It is not a system malfunction.
Inspection End.
4.CHECK THE POWER STEERING CONTROL MODULE SIGNAL (3)
With CONSULT
1. Turn the steering wheel to the straight -ahead position. (There is no steering force)
2. Select “BATTERY VOLT” in “DATA MONITOR” of “EPS”.
Is the display value
“10.5 V” or more?
YES >> GO TO 5.
NO >> Check the battery power system. Refer to STC-23, "Diagnosis Procedure"
.
5.CHECK THE POWER STEERING CONTROL MODULE SIGNAL (4)
With CONSULT
Select “ESTM VHCL SPD” in “DATA MONITOR” of “EPS”.
*: This may not agree with the speedometer indication imm ediately after the ignition switch is turned ON. This
is not a malfunction.
Is the check result normal?
YES >> GO TO 6.
NO >> Check the combination meter, ABS actuator and electric unit (control unit). Refer to MWI-18,
"CONSULT Function (METER/M&A)" and BRC-33, "CONSULT Function (ABS)".
Monitor item Test condition Display value
ESTM VHCL SPD When stopped 0.00 km/h or mph
While driving Approximately equal to the in-
dication on speedometer
*
(Inside of ±10%)
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHTSTC-35
< SYMPTOM DIAGNOSIS >
C
D E
F
H I
J
K L
M A
B
STC
N
O P
6.CHECK THE POWER STEERING CONTROL MODULE SIGNAL (5)
With CONSULT
Select “STR ANG SPD” in “DATA MONITOR” of “EPS”.
Is the check result normal?
YES >> GO TO 7.
NO >> Check the steering angle sensor. Refer to STC-22, "Diagnosis Procedure"
.
7.CHECK THE POWER STEERING CONTROL MODULE SIGNAL (6)
With CONSULT
Select “ENGINE STATUS” in “DATA MONITOR” of “EPS”.
Is the display value
“RUN”?
YES >> GO TO 8.
NO >> Check the ECM. Refer to EC-77, "CONSULT Function"
.
8.CHECK THE STEERING FORCE
Check the steering force. Refer to STC-36, "Diagnosis Procedure"
.
Is the check result normal?
YES >> Inspection End.
NO >> It is possible that there is a mechani cal malfunction. Check the steering system.
Monitor item Test condition Display value
STR ANG SPD The steering wheel is not
steered. Approx. 0.0 deg/s
The steering wheel is steered. Displays steering angle speed
(deg/s)
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

STC-36
< SYMPTOM DIAGNOSIS >
UNBALANCE STEERING WHEEL TURNING FORCE AND RETURN BETWEEN
RIGHT AND LEFT
UNBALANCE STEERING WHEEL TU RNING FORCE AND RETURN BE-
TWEEN RIGHT AND LEFT
Diagnosis ProcedureINFOID:0000000009460377
1.CHECK THE ILLUMINATION OF THE HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING
LAMP
Check the hydraulic pump electric power steering warning lamp while engine is running.
Does the hydraulic pump electric power steering warning lamp turn OFF?
YES >> GO TO 2.
NO >> Refer to STC-33, "Diagnosis Procedure"
.
2.CHECK WHEEL ALIGNMENT
Check the wheel alignment. Refer to FSU-25, "Wheel Alignment (Unladen*
1)".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Adjustment of wheel alignment. Refer to FSU-25, "Wheel Alignment (Unladen*
1)".
3.CHECK STEERING WHEEL TURNING FORCE
Check the steering wheel turning force. Refer to STC-37, "Diagnosis Procedure"
.
Is the inspection result normal?
YES >> Inspection End.
NO >> Check the steering wheel turning force for mechanical malfunction. Refer to STC-34, "Diagnosis
Procedure".
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM