Nissan Qashqai J11. Manual - part 991

STC-24

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORK FLOW

Other conditions

Memo

Interview sheet

Customer 
name

MR/MS

Registration 
number

Initial year 
registration 

Vehicle type

VIN

Storage date

Engine

Mileage

km (Mile)

C1601 BATTERY POWER SUPPLY

STC-25

< DTC/CIRCUIT DIAGNOSIS >

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DTC/CIRCUIT DIAGNOSIS

C1601 BATTERY POWER SUPPLY

DTC Logic

INFOID:0000000010452114

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/DAST 3” self-diagnosis.

Is DTC “C1601” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-25, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010452115

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.

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)

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 and ground.

DTC

Display item

Malfunction detected condition

Possible cause

C1601

BATTERY VOLT

When a power supply voltage to the EPS control unit 
is maintained at 16 V or more or at less than 9 V con-
tinuously for 0.5 second or more.

• Harness or connector
• EPS control unit (steering 

column assembly)

• Fuse
• Power supply system
• Battery

EPS control unit

—

Continuity

Connector

Terminal

M34

10

Ground

Existed

EPS control unit

—

Voltage

Connector

Terminal

M33

4

Ground

Approx. 0 V

STC-26

< DTC/CIRCUIT DIAGNOSIS >

C1601 BATTERY POWER SUPPLY

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 (#4).

3.

Check continuity between EPS control unit harness connector terminal and fuse block (J/B) harness con-
nector terminal.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for ignition power supply circuit. Refer to 

PG-59, "Wiring Diagram -

IGNITION POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

4.

CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (3)

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 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 50A fusible link (#F).

3.

Check the 50A fusible link (#H).

4.

Check the harness for open or short between EPS control unit harness connector No.9 terminal and the
50A fusible link (#F).

5.

Check the harness for open or short between EPS control unit harness connector No.9 terminal and the
50A fusible link (#H).

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit. Refer to 

PG-11, "Wiring Diagram - BAT-

TERY POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

6.

CHECK CONNECTOR

EPS control unit

—

Voltage

Connector

Terminal

M33

4

Ground

10.5 – 16 V

EPS control unit

Fuse block (J/B)

Continuity

Connector

Terminal

Connector

Terminal

M33

4

M76

7B

Existed

EPS control unit

—

Voltage

Connector

Terminal

E34

9

Ground

10.5 – 16 V

EPS control unit

—

Voltage

Connector

Terminal

E34

9

Ground

10.5 – 16 V

C1601 BATTERY POWER SUPPLY

STC-27

< DTC/CIRCUIT DIAGNOSIS >

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Check the EPS control unit pin terminals for damage or loose connection with harness connector.

Is the inspection result normal?

YES

>> Replace steering column assembly. Refer to 

STC-46, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.