2009 NISSAN LATIO Service Repair Manual

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Page 4257 of 4331

NISSAN LATIO 2009 Service Repair Manual STC
N
O P
With CONSULT-III
1. Start engine.
2. Select “DATA MONITOR” mode for “EPS” with CONSULT-III.
3. Check the values of “MOTOR SIG” and “MOTOR CURRENT”. Refer to STC-9, " EPS Co

Page 4258 of 4331

NISSAN LATIO 2009 Service Repair Manual “ CONTROL UNIT [C1608] ” displayed?
YES >> Replace EPS control unit. Refer to
PS-9, " Removal and Installation " .
NO >> INSPECTION END
DTC C1609 CAN VHCL SPEED INFOID:0000000004307303
CONSULT-I

Page 4259 of 4331

NISSAN LATIO 2009 Service Repair Manual STC
N
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OK >>
INSPECTION END
NG >> Perform self-diagnosis with ABS actuator and el ectric unit (control unit) and combination meter.
Refer to BRC-18, " CONSULT-III Function (ABS) " ,

Page 4260 of 4331

NISSAN LATIO 2009 Service Repair Manual STC-20< SERVICE INFORMATION >
[EPS]
TROUBLE DIAGNOSIS FOR SYSTEM
3. Check resistance between EPS control unit harness connector
(A) terminals.
4. If NG, replace the steering column assem

Page 4261 of 4331

NISSAN LATIO 2009 Service Repair Manual TROUBLE DIAGNOSIS FOR SYMPTOMS
STC-21
< SERVICE INFORMATION >
[EPS] C
D E
F
H I
J
K L
M A
B STC
N
O
P
TROUBLE DIAGNOSIS FOR SYMPTOMS
EPS Warning Lamp Does Not Turn ON INFOID:0000000004307307
SYMPTOM:

Page 4262 of 4331

NISSAN LATIO 2009 Service Repair Manual STC-22< SERVICE INFORMATION >
[EPS]
TROUBLE DIAGNOSIS FOR SYMPTOMS
5. Turn ignition switch “OFF”.
6. Check voltage between EPS control unit harness connector (A) terminals and ground.
7. Connect E

STC-22< SERVICE INFORMATION >
[EPS]
TROUBLE DIAGNOSIS FOR SYMPTOMS
5. Turn ignition switch “OFF”.
6. Check voltage between EPS control unit harness connector (A) terminals and ground.
7. Connect EPS control unit harness connector.
OK or NG OK >> GO TO 3.
NG >> Check the following. If any items are damaged, repair or replace damaged parts.
• 60 A fusible link (No. m, located in the fuse and fusible link block). Refer to PG-3 .
• 10 A fuse [No. 2, located in the fuse block (J/B)]. Refer to PG-3 .
• Harness for short or open between battery and EPS control unit harness connector M54 termi-
nal 17.
• Harness for short or open between ignition switch and EPS control unit harness connector M53 terminal 10. 3.
CHECK EPS CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect EPS control unit harness connector.
3. Check continuity between EP S control unit harness connector
(A) terminal and ground.
Also check harness for short to power.
4. Connect EPS control unit harness connector.
OK or NG OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors. 4.
CHECK EPS CONTROL UNIT
Check EPS control unit input/output signal. Refer to STC-9, " EPS Control Unit Input/Output Signal Reference
Value " .
OK or NG OK >> GO TO 5.
NG >> Check EPS control unit pin terminals for dam age or loose connection with harness connector. If
any items are damaged, repair or replace damaged parts. 5.
SYMPTOM CHECK
Check again.
OK or NG OK >>
INSPECTION END
NG >> Replace combination meter. Refer to DI-19, " Removal and Installation " .
Steering Wheel Turning Fo rce Is Heavy or Light INFOID:0000000004307309
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-11, " CONSULT-III F
unction (EPS) " .
Connector Terminal Voltage
M53 10 – Ground Approx. 0 V
M54 17 – Ground Battery voltage SGIA1627E
Connector Terminal Continuity
M54 18 YES SGIA1628E

Page 4263 of 4331

NISSAN LATIO 2009 Service Repair Manual STC
N
O P
Is the “ CAN COMM CIRCUIT [U1000] ” displayed?
YES >> Perform trouble diagnosis for CAN communication line. Refer to
STC-19, " DTC U1000 CAN
COMM CIRCUIT " .
NO-1 >> With

Page 4264 of 4331

NISSAN LATIO 2009 Service Repair Manual YES >> GO TO 2.
NO >> Go to STC-21, " EPS Warning Lamp Does Not Turn OFF " .
Wheel Alignment Inspection " .
OK or NG OK >> GO TO 3.
NG >> Adjust wheel alignment. Refer to FSU-7, " Wheel Alignment

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