Nissan Sentra Service Manual: C1601 Battery power supply
DTC Logic
DTC DETECTION LOGIC
| DTC | Display item | Malfunction detected condition | Possible cause |
| C1601 | BATTERY VOLT | When a power supply voltage to the EPS control unit is maintained at 17.5 V or more or at less than 9 V continuously for five second or more. |
|
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
-
Turn the ignition switch OFF to ON.
-
Perform EPS self-diagnosis.
Is DTC C1601 detected? YES >> Proceed to diagnosis procedure. Refer to STC-22, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis Procedure
Regarding Wiring Diagram information, refer to STC-15, "Wiring Diagram".
1.Check EPS Control unit ground circuit
-
Turn ignition switch OFF.
-
Disconnect EPS control unit harness connector.
-
Check continuity between EPS control unit harness connector terminal and ground.
-
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 unit power supply circuit (1)
-
Check voltage between EPS control unit harness connector terminals and ground.
Is the inspection result normal? YES >> GO TO 4.
NO >> GO TO 3.
3.Check EPS Control unit power supply circuit
(2)
-
Turn ignition switch OFF.
-
Check the 10A fuse (#5).
-
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 PCS-70, "Wiring Diagram".
NO >> Repair or replace the malfunctioning parts.
4.Check EPS Control unit power supply circuit (3)
-
Turn ignition switch OFF.
-
Check voltage between EPS control unit harness connector terminals and ground.
-
Turn ignition switch ON.
CAUTION:
Never start the engine.
-
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)
-
Turn ignition switch OFF.
-
Check the 60A fusible link (#M).
-
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 PCS-70, "Wiring Diagram".
NO >> Repair or replace the malfunctioning parts.
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 ST-12, "Removal and Installation".
NO >> Repair or replace the malfunctioning parts.
C1604 Torque sensor
DTC Logic
DTC DETECTION LOGIC
DTC
Display item
Malfunction detected condition
Possible cause
C1604
TORQUE SENSOR
When torque sensor output signal is malfunctioning
...
Other materials:
Basic inspection
Diagnosis and repair workflow
Workflow
OVERALL SEQUENCE
DETAILED FLOW
1.INTERVIEW CUSTOMER
Interview the customer to obtain as much information as possible about the
conditions and environment under
which the malfunction occurred.
>> GO TO 2.
2.SYMPTOM CHECK
Verify symptoms.
...
S terminal circuit
Description
The output voltage of the generator is controlled by the IC regulator at
terminal “S” detecting the input voltage
from battery.
The “S” terminal circuit detects the battery voltage to adjust the generator
output voltage with the IC voltage
regulator.
Diagn ...
EPS Warning lamp
Component Function Check
1.CHECK THE ILLUMINATION OF THE EPS WARNING LAMP
Check that the EPS warning lamp turns ON when ignition switch
turns ON. Then, EPS warning lamp turns
OFF after the engine is started.
Is the inspection result normal?
YES >> Inspection End.
NO >> Perfo ...
