2007 NISSAN LATIO wheel

TROUBLE DIAGNOSIS
STC-7
[EPS]
C
D
E
F
H
I
J
K
L
MA
B
STC
Revision: June 20062007 Versa
TROUBLE DIAGNOSISPFP:00004
Fail-Safe FunctionUGS0008G

If any malfunction occurs in the system, and control unit detects the malfunction, EPS warning lamp on
combination meter turns ON to indicate system malfunction.

When EPS warning lamp is ON, enters a manual steering state. (Control turning force steering wheel
becomes heavy.)
How to Perform Trouble DiagnosisUGS00090
BASIC CONCEPT

To perform trouble diagnosis, it is the must to have understanding about vehicle systems (control and
mechanism) thoroughly.

It is also important to clarify customer complaints before starting
the inspection.
First of all, reproduce the symptoms, and understand them fully.
Ask customer about his/her complaints carefully. In some cases,
it will be necessary to check symptoms by driving vehicle with
customer.
CAUTION:
Customers are not professionals. It is dangerous to make
an easy guess like “maybe the customer means that...” or
“maybe the customer mentions this symptom”.

It is essential to check symptoms right from the beginning in
order to repair malfunctions completely.
For intermittent malfunctions, reproduce symptoms based on
interview with customer and past examples. Do not perform
inspection on ad hoc basis. Most intermittent malfunctions are
caused by poor contacts. In this case, it will be effective to shake
suspected harness or connector by hand. When repairing with-
out any symptom diagnosis, you cannot judge if malfunctions
has actually been eliminated.
PRECAUTIONS FOR TROUBLE DIAGNOSIS

Be sure to check the procedures of the trouble diagnosis in advance. Refer to STC-7, "How to Perform
Trouble Diagnosis" .

Always erase memory after completing trouble diagnosis. Refer to STC-13, "How to Erase Self-Diagnostic
Results" .

Checking continuity and voltage between units, be sure to check connector terminals for disconnection,
looseness, bend, or collapse. Repair or replace applicable part if any non-standard condition is detected.

Be careful not to forcibly extend any connector terminal if a circuit tester is used for the check.

Always confirm the general precautions. Refer to GI-4, "General Precautions" .
INTERVIEW

Complaints vary depending on the person. It is important to clar-
ify the customer's actual remarks.

Ask the customer about what symptoms occur under what con-
ditions. Use the information to reproduce the symptom of con-
firm by vehicle.
SEF 2 33 G
SEF 2 34 G
SEF 9 07 L

TROUBLE DIAGNOSIS
STC-11
[EPS]
C
D
E
F
H
I
J
K
L
MA
B
STC
Revision: June 20062007 Versa
EPS Control Unit Input/Output Signal Reference ValuesUGS0007X
SPECIFICATIONS WITH CONSULT-II
CAUTION:
The output signal indicates the EPS control unit calculation date. The normal values will be displayed
even in the event that the output circuit (harness) is open.
*1 : In the front of the value, “L” is displayed at steering left and “R” is displayed at steering right.
*2 : Almost in accordance with the value of “MOTOR SIG”. It is not a malfunction though these values are not accorded when steering
quickly.
*3 : It is not a malfunction, though it might not be corresponding just after ignition switch is turned ON.
*4 : It turns to OFF after waiting for a short period of time.Monitor item (Unit) Content Condition Display value
MOTOR VOL (V)Power supply voltage for
EPS control unitIgnition switch: ON Battery voltage
TORQUE SENSOR (Nm)Steering wheel turning
forceEngine runningSteering wheel: Not
steering (There is no
steering force) 0.00 Nm
Steering wheel: Steer-
ing0 – 8.19 Nm
*1 (The value
is changed according to
steering left or right)
MOTOR SIG (A)Command current to EPS
motorEngine runningSteering wheel: Not
steering (There is no
steering force)0.00 A
Steering wheel: Steer-
ing0 – 65.00 A (The value is
changed according to
steering left or right)
MOTOR CURRENT (A)Consumption current of
EPS motorEngine runningSteering wheel: Not
steering (There is no
steering force)0.00 A
Steering wheel: Steer-
ing0 – 65.00 A
*2 (The value
is changed according to
steering left or right)
VEHICLE SPEED (km/h) or (mph) Vehicle speedVehicle stopped 0 km/h (0 mph)
While drivingApproximately equal to
the indication on speed-
ometer (Inside of ±10%)
*3
WARNING LAMP (ON/OFF)EPS warning lamp condi-
tionEPS warning lamp: ON ON
EPS warning lamp: OFF OFF
DERATING STAT (ON/OFF) Protect overload status Engine runningSteering wheel: Nor-
mal steeringOFF
Steering wheel: Steer-
ing over the stopON
*4
ENGINE STATUS (RUN/STOP) Engine statusEngine stopped
(Engine speed: Less than 400 rpm)STOP
Engine running
(Engine speed: 400 rpm or more)RUN

STC-12
[EPS]
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
SPECIFICATIONS BETWEEN EPS CONTROL UNIT TERMINALS
EPS Control Unit Terminal Connector Layout
Data are reference value and are measured.
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.
SGIA1624E
Te r m i n a lWire
colorItem Condition Data (Approx.)
4 V Torque sensor sub Engine runningSteering wheel: Not steering
(There in no steering force)2.5 V
Steering wheel: Steering1.7 V – 3.3 V
(The value is changed accord-
ing to steering left or right)
5 BR Torque sensor power supplyIgnition switch: ON 8 V
Ignition switch: OFF 0 V
6 G Torque sensor main Engine runningSteering wheel: Not steering
(There is no steering force)2.5 V
Steering wheel: Steering1.7 V – 3.3 V
(The value is changed accord-
ing to steering left or right)
7 R Torque sensor ground Always 0 V
9 L CAN-H — —
10 O Power supplyIgnition switch: ON Battery voltage
Ignition switch: OFF 0 V
16 P CAN-L — —
17 R Power supply (Memory back-up)Ignition switch: ON Battery voltage
Ignition switch: OFF Battery voltage
18 B Ground Always 0 V
19 — Motor (+) — —
20 — Motor (–) — —

STC-14
[EPS]
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
2. Turn ignition switch “OFF” to erase memory.
3. Turn ignition switch “ON” and select “SELF-DIAG RESULTS” mode with CONSULT-II.
4. Touch “ERASE” on CONSULT-II screen to erase DTC memory.
CAUTION:
If memory cannot be erased, perform diagnosis.
DATA MONITOR
Operation Procedure
1. Perform “CONSULT-II Start Procedure”. Refer to GI-38, "CONSULT-II Start Procedure" .
2. Touch “DATA MONITOR”.
3. Select from “SELECT MONITOR ITEM”, screen of data monitor mode is displayed.
NOTE:
When malfunction is detected, CONSULT-II performs REAL-TIME DIAGNOSIS. Also, any malfunc-
tion detected while in this mode will be displayed at real time.
Display Item List
EPS CONTROL UNIT PART NUMBER
Display a part number of EPS control unit carried by a vehicle.
Monitor item (Unit) Remarks
MOTOR VOL (V) Power supply voltage for EPS control unit is displayed
TORQUE SENSOR (Nm) Steering wheel turning force detected by torque sensor is displayed
MOTOR SIG (A) Current commanded value to EPS motor is displayed
MOTOR CURRENT (A) Current value consumed by EPS motor is displayed
VEHICLE SPEED (km/h) or (mph) Vehicle speed is displayed from vehicle speed signal with CAN communication
WARNING LAMP (ON/OFF) EPS warning lamp control status is displayed
DERATING STAT (ON/OFF) Protect overload status is displayed
ENGINE STATUS (STOP/RUN) Engine speed is displayed from engine status signal with CAN communication
SGIA1532E

TROUBLE DIAGNOSIS
STC-15
[EPS]
C
D
E
F
H
I
J
K
L
MA
B
STC
Revision: June 20062007 Versa
Symptom ChartUGS0008I
If EPS warning lamp turns ON, perform self-diagnosis. Refer to STC-13, "SELF-DIAG RESULTS MODE" .
Symptom Condition Check item Reference page
EPS warning lamp does not turn ON when
ignition switch to “ON”.
(EPS warning lamp check)Ignition switch: ONCAN communication line
STC-26
Combination meter
EPS warning lamp does not turn OFF for
several seconds after starting the engineEngine runningCAN communication line
STC-27
Power supply and ground for
EPS control unit
Torque sensor
EPS motor
Vehicle speed signal
Engine status signal
Combination meter
Steering wheel turning force is heavy or light,
while driving

While driving

Steering wheel turningCAN communication line
STC-29
Vehicle speed signal
Engine status signal
EPS motor
Steering wheel turning force
(Mechanical malfunction)
Unbalance steering wheel turning force and
return between right and left, while driving

While driving

Steering wheel turningWheel alignment
STC-31Steering wheel turning force
(Mechanical malfunction)
Unbalance steering wheel turning force,
while driving (Torque variation)

While driving

Steering wheel turningSteering column intermediate
shaft installation condition
STC-32Steering wheel turning force
(Mechanical malfunction)

TROUBLE DIAGNOSIS FOR SYSTEM
STC-19
[EPS]
C
D
E
F
H
I
J
K
L
MA
B
STC
Revision: June 20062007 Versa
DTC C1604 TORQUE SENSORUGS0008K
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Data are reference value.
*: In the front of the value, “L” is displayed at steering left and “R” is displayed at steering right.
EPS CONTROL UNIT TERMINALS AND REFERENCE VALUE
Data are reference value and are measured between each terminal and ground.
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.
DIAGNOSTIC PROCEDURE
1. CHECK TORQUE SENSOR SIGNAL
With CONSULT-II
1. Start engine.
2. Select “DATA MONITOR” mode for “EPS” with CONSULT-II.
3. Check the value of “TORQUE SENSOR”. Refer to STC-11, "
SPECIFICATIONS WITH CONSULT-II" .
Without CONSULT-II
1. Start engine.
2. Check voltage between EPS control unit harness connector M53 terminals 4, 5, 6, 7 and ground. Refer to
STC-12, "
SPECIFICATIONS BETWEEN EPS CONTROL UNIT TERMINALS" .
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
Monitor item (Unit) Content Condition Display value
TORQUE SENSOR (Nm) Steering wheel turning force Engine runningSteering wheel: Not steering
(There is no steering force)0.00 Nm
Steering wheel: Steering0 – 8.19 Nm*
(The value is changed
according to steering
left or right)
TerminalWire
color Item Condition Data (Approx.)
4 V Torque sensor sub Engine runningSteering wheel: Not steering
(There is no steering force)2.5 V
Steering wheel: Steering1.7 V – 3.3 V
(The value is
changed accord-
ing to steering
left or right)
5 BR Torque sensor power supplyIgnition switch: ON 8 V
Ignition switch: OFF 0 V
6 G Torque sensor main Engine runningSteering wheel: Not steering
(There is no steering force)2.5 V
Steering wheel: Steering1.7 V – 3.3 V
(The value is
changed accord-
ing to steering
left or right)
7 R Torque sensor ground Always 0 V

TROUBLE DIAGNOSIS FOR SYSTEM
STC-21
[EPS]
C
D
E
F
H
I
J
K
L
MA
B
STC
Revision: June 20062007 Versa
DTC C1606 EPS MOTORUGS0008L
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Data are reference value.
* : Almost in accordance with the value of “MOTOR SIG”. It is not a malfunction though these values are not accorded when steering
quickly.
EPS CONTROL UNIT TERMINALS AND REFERENCE VALUE
Data are reference value and are measured between each terminal and ground.
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.
DIAGNOSTIC PROCEDURE
1. CHECK EPS MOTOR SIGNAL
With CONSULT-II
1. Start engine.
2. Select “DATA MONITOR” mode for “EPS” with CONSULT-II.
3. Check the values of “MOTOR SIG” and “MOTOR CURRENT”. Refer to STC-11, "
SPECIFICATIONS
WITH CONSULT-II" .
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2. CHECK EPS MOTOR
1. Turn ignition switch “OFF”.
2. Disconnect EPS control unit harness connector.
3. Check resistance between EPS control unit harness connector
(A) terminals.
4. Connect EPS control unit harness connector.
OK or NG
OK >> GO TO 3.
NG >> EPS motor is malfunctioning. Replace steering column
assembly. Refer to PS-9, "
Removal and Installation" .
Monitor item (Unit) Content Condition Display value
MOTOR SIG (A)Command current to
EPS motorEngine runningSteering wheel: Not steering
(There is no steering force)0.00 A
Steering wheel: Steering0 – 65.00 A
(The value is changed
according to steering left
or right)
MOTOR CURRENT (A)Consumption current of
EPS motorEngine runningSteering wheel: Not steering
(There is no steering force)0.00 A
Steering wheel: Steering0 – 65.00 A *
(The value is changed
according to steering left
or right)
Terminal Wire color Item Condition Data (Approx.)
19 — Motor (+) — —
20 — Motor (−)— —
Connector Terminal Resistance
M60 19 – 20 Approx. 0.1 Ω or less
SGIA1630E

TROUBLE DIAGNOSIS FOR SYMPTOMS
STC-29
[EPS]
C
D
E
F
H
I
J
K
L
MA
B
STC
Revision: June 20062007 Versa
Steering Wheel Turning Force is Heavy or LightUGS0008U
SYMPTOM:
Steering wheel turning force is heavy or light, while driving.
DIAGNOSTIC PROCEDURE
1. CHECK SYSTEM FOR CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to STC-13, "
SELF-DIAG RESULTS MODE" .
Is the
“CAN COMM CIRCUIT [U1000]” displayed?
YES >> Perform trouble diagnosis for CAN communication line. Refer to STC-24, "DTC U1000 CAN
COMM CIRCUIT" .
NO-1 >> With ABS: GO TO 2.
NO-2 >> Without ABS: GO TO 3.
2. CHECK VEHICLE SPEED SIGNAL FROM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to BRC-20, "
SELF-DIAGNO-
SIS" .
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 4.
3. CHECK VEHICLE SPEED SIGNAL FROM TRANSMISSON CONTROL MODULE (TCM)
Perform self-diagnosis with TCM. Refer to AT-82, "
SELF-DIAGNOSTIC RESULT MODE" .
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 4.
4. CHECK COMBINATION METER SIGNAL
Perform self-diagnosis with combination meter. Refer to DI-14, "
SELF-DIAGNOSTIC RESULTS" .
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 5.
5. CHECK ENGINE STATUS SIGNAL
Perform self-diagnosis for ECM. Refer to EC-116, "
SELF-DIAG RESULTS MODE" .
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 6.
6. CHECK EPS MOTOR SYSTEM
Perform trouble diagnosis for EPS motor. Refer to STC-21, "
DTC C1606 EPS MOTOR" .
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
7. CHECK EPS CONTROL UNIT
Check EPS control unit input/output signal. Refer to STC-11, "
EPS Control Unit Input/Output Signal Reference
Va lu e s" .
OK or NG
OK >> GO TO 8.
NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If
any items are damaged, repair or replace damaged parts.