2010 NISSAN LATIO air condition

C1601 BATTERY POWER SUPPLYSTC-9
< DTC/CIRCUIT DIAGNOSIS > [EPS]
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DTC/CIRCUIT DIAGNOSIS
C1601 BATTERY POWER SUPPLY
DescriptionINFOID:0000000005600161
Power is supplied from the battery to EPS control unit.
DTC LogicINFOID:0000000005600162
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform EPS control unit self-diagnosis.
Is DTC
“C1601” detected?
YES >> Proceed to diagnosis procedure. Refer to STC-9, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005600163
1.CHECK EPS CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect EPS control unit harness connector.
3. Check continuity between EPS control unit harness connector terminal and ground.
4. Connect EPS control unit harness connector.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
2.CHECK EPS CONTROL UNI T POWER SUPPLY CIRCUIT
1. Check voltage between EPS control unit harness connector terminals and ground.
2. Turn ignition switch ON. CAUTION:
Never start the engine.
3. Check voltage between EPS control unit harness connector terminals and ground.
DTC Display item Malfunction detected condition Possible cause
C1601 BATTERY VOLT When a power supp
ly voltage to the EPS control unit
is maintained at or above 17.5 V or less than 9 V con-
tinuously for more than five seconds. • Harness or connector
• EPS control unit
EPS control unit
—Con tin uit y
Connector Terminal
M54 18Ground Existed
EPS control unit
—Volt a g e
Connector Terminal
M53 10
Ground Approx. 0 V
M54 17 Battery voltage
Revision: January 20102010 Versa

STC-10
< DTC/CIRCUIT DIAGNOSIS >[EPS]
C1601 BATTERY POWER SUPPLY
Is the inspection result normal?
YES >> GO TO 3.
NO >> Check the following. If any items are damaged, repair or replace damaged parts.
• 10A fuse (#2) open
- Harness for short between 10A fuse (#2) and pow er steering control unit harness connector No.
10 terminal.
• 60A fusible link (M) open
- Harness for short between 60A fusible link (M) and power steering control unit harness connec-
tor No. 10 terminal.
• Harness for open between ignition switch and power steering control unit harness connector No. 17 terminal.
• Harness for open between battery and power steering control unit harness connector No. 17 ter-
minal.
• Battery or ignition switch.
3.CHECK BATTERY VOLTAGE SIGNAL (1)
With CONSULT-III
1. Connect EPS control unit harness connector.
2. Start the engine. CAUTION:
Stop the vehicle.
3. Select “EPS”, “DATA MONITOR” and “MOTOR VO LT”, and perform the battery voltage inspection.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace EPS control unit. Refer to PS-9, "
Removal and Installation".
4.CHECK MOTOR VOLTAGE SIGNAL (2)
With CONSULT-III
Select “MOTOR VOLT” in “DATA MONITOR” of the EPS control unit. Check motor voltage with the steering
wheel fully turned leftward or rightward.
Is the value in
“DATA MONITOR”“between 9 V and 17.5 V”?
YES >> Check pin terminal and connection of each harness connector for damage or loose connection.
NO >> Check battery power supply and ignition power supply. Refer to STC-22, "
Wiring Diagram - ELEC-
TRONICALLY CONTROLLED POWER STEERING SYSTEM -".
EPS control unit
—Volt a ge
Connector Terminal
M53 10
Ground Battery voltage
M54 17
Monitor item ConditionDisplay value
MOTOR VOLT Engine runningBattery voltage
Revision: January 20102010 Versa

C1604 TORQUE SENSORSTC-11
< DTC/CIRCUIT DIAGNOSIS > [EPS]
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C1604 TORQUE SENSOR
DescriptionINFOID:0000000005600165
Torque sensor detects the steering torque, and transmit the signal to EPS control unit.
DTC LogicINFOID:0000000005600166
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform EPS control unit self-diagnosis.
Is DTC
“C1604” detected?
YES >> Proceed to diagnosis procedure. Refer to STC-11, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005600167
1.CHECK TORQUE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF to ON. CAUTION:
Never start the engine.
2. Check voltage between EPS control unit harness connector terminals and ground. CAUTION:
Steering wheel is neutral position. (There is no steering force.)
Is the inspection result normal?
YES >> GO TO 2.
NO >> Perform the trouble diagnosis for battery power supply circuit. Refer to STC-9, "
Diagnosis Proce-
dure".
2.CHECK TORQUE SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between EPS control unit harness connector terminal and ground. CAUTION:
Steering wheel is neutral position. (There is no steering force.)
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
DTC Display item Malfunction detected condition Possible cause
C1604 TORQUE SENSOR When torque sensor output signal is malfunctioning. • Harness or connector
• Torque sensor
• EPS control unit
EPS control unit
—Volt a g e
Connector Terminal
M53 5Ground Approx. 5 V
EPS control unit
—Con tin uit y
Connector Terminal
M53 7Ground Yes
Revision: January 20102010 Versa

C1606 EPS MOTORSTC-13
< DTC/CIRCUIT DIAGNOSIS > [EPS]
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C1606 EPS MOTOR
DescriptionINFOID:0000000005600169
EPS motor provides the assist torque by the control signal from EPS control unit.
DTC LogicINFOID:0000000005600170
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform EPS control unit self-diagnosis.
Is DTC
“C1606” detected?
YES >> Proceed to diagnosis procedure. Refer to STC-13, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005600171
1.CHECK EPS MOTOR
Check the EPS motor. Refer to STC-13, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> EPS motor is malfunction. Replace steering column assembly. Refer to PS-9, "
Removal and
Installation".
2.CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect EPS motor harness connector.
3. Check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or replace terminal.
Is the inspection result normal?
YES >> Replace EPS control unit. Refer to PS-9, "Removal and Installation".
NO >> Repair or replace error-detected parts.
Component Inspection INFOID:0000000005600172
1.CHECK EPS MOTOR
1. Turn the ignition switch OFF.
2. Disconnect EPS motor harness connector.
3. Check resistance between EPS motor connector terminals.
Is the inspection result normal?
YES >> Inspection End
DTC Display item Malfunction detected condition Possible cause
C1606 EPS MOTOR When the motor driver malfunction of EPS control
unit or EPS motor malfunction is detected. • Harness or connector
• EPS motor
• EPS control unit
EPS motor
Resistance (Approx.)
Te r m i n a l
19 20 0.1 Ω or less
Revision: January 20102010 Versa

C1607, C1608 EPS CONTROL UNIT
STC-15
< DTC/CIRCUIT DIAGNOSIS > [EPS]
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C1607, C1608 EPS CONTROL UNIT
DescriptionINFOID:0000000005600174
EPS control unit performs an arithmetical operation on data, such as steering wheel turning force (sensor sig-
nal) from the torque sensor, vehicle speed signal, etc. T hen it generates an optimum assist torque signal to the
EPS motor according to the driving condition.
DTC LogicINFOID:0000000005600175
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform EPS control unit self-diagnosis.
Is DTC
“C1607” or “C1608” detected?
YES >> Proceed to diagnosis procedure. Refer to STC-15, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005600176
1.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Erase EPS control unit self-diagnostic results.
3. Perform EPS control unit self-diagnosis.
Is DTC
“C1607” or “C1608” detected?
YES >> Replace EPS control unit. Refer to PS-9, "Removal and Installation".
NO >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If
any item are damaged, repair or replace error-detected parts.
DTC Display item Malfunction detected condition Possible cause
C1607 EEPROM When the memory (EEPROM)
system malfunction is
detected in EPS control unit.
EPS control unit
C1608 CONTROL UNIT When the internal malfunction is detected in EPS
control unit.
Revision: January 20102010 Versa

STC-16
< DTC/CIRCUIT DIAGNOSIS >[EPS]
C1609 VEHICLE SPEED SIGNAL
C1609 VEHICLE SPEED SIGNAL
DescriptionINFOID:0000000005600177
EPS control unit receives the vehicle speed signal from ABS actuator and electric unit (control unit) via CAN
communication line.
DTC LogicINFOID:0000000005600178
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform EPS control unit self-diagnosis.
Is DTC
“C1609” detected?
YES >> Proceed to diagnosis procedure. Refer to STC-16, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005600179
1.PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform ABS actuator and electrical uni t (control unit) self-diagnosis. Refer to BRC-20, "
CONSULT-III
Function (ABS)".
Is any DTC detected?
YES >> Check the DTC. Refer to BRC-20, "CONSULT-III Function (ABS)".
NO >> GO TO 2.
2.PERFORM SELF-DIAGNOSIS
With CONSULT-III
Perform EPS control unit self-diagnosis.
Is DTC
“C1609” detected?
YES >> Replace EPS control unit. Refer to PS-9, "Removal and Installation".
NO >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If
any item are damaged, repair or replace error-detected parts.
DTC Display item Malfunction detected condition Possible cause
C1609 CAN VHCL SPEED • Malfunction is detected in vehicle speed signal that
is output from ABS actuator and electric unit (con-
trol unit) via CAN communication.
• ABS actuator and electric unit (control unit) input signal error is detected. • Harness or connector
• CAN communication line
• EPS control unit
• ABS malfunction
- Vehicle speed signal error
Revision: January 20102010 Versa

C1610 ENGINE STATUS SIGNALSTC-17
< DTC/CIRCUIT DIAGNOSIS > [EPS]
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C1610 ENGINE STATUS SIGNAL
DescriptionINFOID:0000000005600180
EPS control unit receives the engine status signal from ECM via CAN communication line.
DTC LogicINFOID:0000000005600181
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform EPS control unit self-diagnosis.
Is DTC
“C1610” detected?
YES >> Proceed to diagnosis procedure. Refer to STC-17, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005600182
1.PERFORM ECM SELF-DIAGNOSIS
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform ECM self-diagnosis. Refer to EC-98, "
CONSULT-III Function" (HR16DE), EC-612, "CONSULT-III
Function (ENGINE)" (MR18DE).
Is any DTC detected?
YES >> Check the DTC. Refer to EC-468, "DTCIndex" (HR16DE), EC-503, "U0101-U1001" (MR18DE).
NO >> GO TO 2.
2.PERFORM SELF-DIAGNOSIS
With CONSULT-III
Perform EPS control unit self-diagnosis.
Is DTC
“C1610” detected?
YES >> Replace EPS control unit. Refer to PS-9, "Removal and Installation".
NO >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If
any item are damaged, repair or replace error-detected parts.
DTC Display item Malfunction detected condition Possible cause
C1610 CAN ENG RPM • Malfunction is detected in engine status signal
that is output from ECM via CAN communica-
tion.
• ECM input signal error is detected. • Harness or connector
• CAN communication line
• EPS control unit
•ECM
- Engine status signal error
Revision: January 20102010 Versa

STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHTSTC-27
< SYMPTOM DIAGNOSIS > [EPS]
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STEERING WHEEL TURNING FO RCE IS HEAVY OR LIGHT
DescriptionINFOID:0000000005600199
Steering wheel turning force is heavy or light.
Diagnosis ProcedureINFOID:0000000005600200
1.CHECK THE ILLUMINATION OF THE EPS WARNING LAMP
Check that the EPS warning lamp turns ON when igni tion switch turns ON. Then, EPS warning lamp turns
OFF after the engine is started.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 2.
2.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform EPS control unit self-diagnosis.
Is any DTC detected?
YES >> Check the DTC. Refer to STC-24, "DTC Index".
NO >> GO TO 3.
3.CHECK EPS CONTROL UNIT SIGNAL
With CONSULT-III
1. Start the engine. CAUTION:
Stop the vehicle.
2. Turn steering wheel from full left stop to full right stop.
3. Select “TORQUE SENSOR” of “DATA MONITOR” for EPS control unit.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.CHECK EPS MOTOR
Perform the trouble diagnosis of EPS motor. Refer to STC-13, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace the specific malfunctioning part.
5.CHECK STEERING WH EEL TURNING FORCE
Check the steering wheel turning force. Refer to PS-6, "
On-Vehicle Inspection and Service".
Is the inspection result normal?
YES >> Inspection End
NO >> Check the steering wheel turning force for mechanical malfunction. Refer to PS-6, "
On-Vehicle
Inspection and Service".
Monitor item ConditionDisplay value
TORQUE SENSOR Steering wheel: Not steer-
ing (There is no steering
force)
Approx. 0 Nm
Steering wheel: Right turn Positive value (Nm)
Steering wheel: Left turn Negative value (Nm)
Revision: January 20102010 Versa