Nissan Tiida C11. Manual — part 1226
EPS CONTROL UNIT
STC-27
< ECU DIAGNOSIS >
[EPS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
Fail-Safe Function
INFOID:0000000001697717
• If any malfunction occurs in the system, and control unit detects the malfunction, EPS warning lamp on com-
bination 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.)
ALGIA0028GB
STC-28
< ECU DIAGNOSIS >
[EPS]
EPS CONTROL UNIT
DTC Index
INFOID:0000000001716730
DTC
Items (CONSULT screen terms)
Reference
C1601
BATTERY POWER SUPPLY
C1604
TORQUE SENSOR
C1606
EPS MOTOR
C1607
EEPROM
C1608
EPS CONTROL UNIT
C1609
CAN VHCL SPEED
C1610
CAN ENG RPM
U1000
CAN COMM CIRCUIT
EPS SYSTEM SYMPTOMS
STC-29
< SYMPTOM DIAGNOSIS >
[EPS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
SYMPTOM DIAGNOSIS
EPS SYSTEM SYMPTOMS
Symptom Chart
INFOID:0000000001716771
If EPS warning lamp turns ON, perform self-diagnosis. Refer to
STC-7, "CONSULT-III Function (EPS)"
Symptom
Condition
Check item
Reference page
EPS warning lamp does not turn ON when ig-
nition switch to “ON”.
(EPS warning lamp check)
Ignition switch: ON
CAN communication line
Combination meter
EPS warning lamp does not turn OFF for sev-
eral seconds after starting the engine
Engine running
CAN communication line
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 turning
CAN communication line
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 turning
Wheel alignment
Steering wheel turning force
(Mechanical malfunction)
Unbalance steering wheel turning force,
while driving (Torque variation)
• While driving
• Steering wheel turning
Steering column intermediate
shaft installation condition
Steering wheel turning force
(Mechanical malfunction)
STC-30
< SYMPTOM DIAGNOSIS >
[EPS]
EPS WARNING LAMP DOES NOT TURN ON
EPS WARNING LAMP DOES NOT TURN ON
Diagnosis Procedure
INFOID:0000000001697733
SYMPTOM:
EPS warning lamp does not turn ON when ignition switch to “ON”.
DIAGNOSTIC PROCEDURE
1.
CHECK SYSTEM FOR CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to
STC-7, "CONSULT-III Function (EPS)"
Is the “CAN COMM CIRCUIT [U1000]” displayed?
YES
>> Perform trouble diagnosis for CAN communication line. Refer to
.
NO
>> GO TO 2.
2.
CHECK EPS CONTROL UNIT
Check EPS control unit input/output signal. Refer to
STC-22, "EPS Control Unit Input/Output Signal Reference
OK or NG
OK
>> GO TO 3.
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.
3.
SYMPTOM CHECK
Check again.
OK or NG
OK
>> INSPECTION END
NG
>> Replace combination meter. Refer to
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