Nissan Sentra. Instruction — part 829
C1601 BATTERY POWER SUPPLY
STC-23
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
2. Turn ignition switch ON.
CAUTION:
Never start the engine.
3. Check voltage between EPS control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (2)
1. Turn ignition switch OFF.
2. Check the 10A fuse (#5).
3. Check the harness for open or short between EPS control unit harness connector terminal 4 and the 10A
fuse (#5).
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for ignition power supply circuit. Refer to
NO
>> Repair or replace the malfunctioning parts.
4.
CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (3)
1. Turn ignition switch OFF.
2. Check voltage between EPS control unit harness connector terminals and ground.
3. Turn ignition switch ON.
CAUTION:
Never start the engine.
4. Check voltage between EPS control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (4)
1. Turn ignition switch OFF.
2. Check the 60A fusible link (#M).
3. Check the harness for open or short between EPS control unit harness connector terminal 9 and the 60A
fusible link (#M).
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit. Refer to
.
NO
>> Repair or replace the malfunctioning parts.
EPS control unit
—
Voltage
Connector
Terminal
M87
4
Ground
Approx. 0 V
EPS control unit
—
Voltage
Connector
Terminal
M87
4
Ground
Battery voltage
EPS control unit
—
Voltage
Connector
Terminal
M37
9
Ground
Battery voltage
EPS control unit
—
Voltage
Connector
Terminal
M37
9
Ground
Battery voltage
STC-24
< DTC/CIRCUIT DIAGNOSIS >
C1601 BATTERY POWER SUPPLY
6.
CHECK TERMINALS AND HARNESS CONNECTORS
Check the EPS control unit pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
>> EPS control unit is malfunctioning. Replace steering column assembly. Refer to
.
NO
>> Repair or replace the malfunctioning parts.
C1604 TORQUE SENSOR
STC-25
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
C1604 TORQUE SENSOR
DTC Logic
INFOID:0000000009757439
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 “C1604” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000009757440
Regarding Wiring Diagram information, refer to
.
1.
CHECK TORQUE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
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
.
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.)
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
—
Voltage
Connector
Terminal
M27
18
Ground
Approx. 5 V
STC-26
< DTC/CIRCUIT DIAGNOSIS >
C1604 TORQUE SENSOR
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.
3.
CHECK TORQUE SENSOR SIGNAL
1. Turn ignition switch OFF to ON.
2. Check voltage between EPS control unit harness connector terminal and ground.
CAUTION:
Steering wheel is neutral position. (There is no steering force.)
3. Start the engine.
4. Check voltage between EPS control unit harness connector terminal and ground.
CAUTION:
Steering wheel is right or left turn.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Torque sensor is malfunction. Replace steering column assembly. Refer to
4.
CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect EPS control unit 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
STC-39, "Removal and Installation"
.
NO
>> Repair or replace the malfunctioning parts.
EPS control unit
—
Continuity
Connector
Terminal
M27
15
Ground
Yes
EPS control unit
—
Voltage
Connector
Terminal
M27
17
Ground
Approx. 2.5 V
16
EPS control unit
—
Voltage
Connector
Terminal
M27
17
Ground
Approx. 1.6 V
− 3.4
V
(The value is
changed accord-
ing to steering left
or right)
16
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