Nissan Leaf. Manual - part 1144

 

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Nissan Leaf. Manual - part 1144

 

 

DIAGNOSIS AND REPAIR WORK FLOW

STC-21

< BASIC INSPECTION >

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

YES

>> GO TO 7.

NO

>> Check harness and connectors based on the information obtained by interview. Refer to 

GI-53,

"Intermittent Incident"

.

7.

FINAL CHECK

 With CONSULT

1. Check the reference value for “EPS” control unit.

2. Recheck the symptom and check that symptom is not reproduced on the same conditions.
Is the symptom reproduced?

YES

>> GO TO 3.

NO

>> Inspection End.

Diagnostic Work Sheet

INFOID:0000000010119194

Description

• In general, customers have their own criteria for a problem. Therefore, it is important to understand the

symptom and status well enough by asking the customer about his/her concerns carefully. To systemize all

the information for the diagnosis, prepare the interview sheet referring to the interview points.

• In some cases, multiple conditions that appear simultaneously may cause a DTC to be detected.

Interview sheet sample

Interview sheet

Customer 
name

MR/MS

Registration 
number

Initial year 
registration 

Vehicle type

VIN

Storage date

Mileage

km (Mile)

Symptom

†

The steering wheel position (center) is in the wrong position.

†

EPS warning lamp turns on.

†

Noise

†

Vibration

†

Others

(

)

First occurrence

†

Recently

†

Others (

)

Frequency of occurrence

†

Always

†

Under a certain conditions of

†

Sometimes (time(s)/day)

Climate con-
ditions

†

Irrelevant

Weather

†

Fine

†

Cloud

†

Rain

†

Snow

†

Others (

)

Temperature

†

Hot

†

Warm

†

Cool

†

Cold

†

Temperature [Approx.

°C °F)]

Relative humidity

†

High

†

Moderate

†

Low

Road conditions

†

Urban area

†

Suburb area

†

High way

†

Mountain road (uphill or down hill)

†

Rough road

Operation conditions, etc.

†

Irrelevant

†

During driving

†

During acceleration

†

At constant speed driving

†

During deceleration

†

During cornering (right curve or left curve)

†

During steering

STC-22

< 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

Mileage

km (Mile)

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

DTC/CIRCUIT DIAGNOSIS

C1601 BATTERY POWER SUPPLY

DTC Logic

INFOID:0000000010119195

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn power 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 power switch OFF to ON.

2. Perform “Self-Diagnosis Result” of “EPS” control unit.
Is DTC “C1601” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-23, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010119196

Regarding Wiring Diagram information, refer to 

STC-16, "Wiring Diagram"

.

1.

CHECK EPS CONTROL UNIT GROUND CIRCUIT

1. Turn power switch OFF.

2. Disconnect EPS control unit harness connector.

3. Check continuity between EPS control unit harness connector terminal and ground.

4. 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)

1. Check voltage between EPS control unit harness connector terminals 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 18.2 V or more or at less than 9 V 
continuously for five second or more.

• Harness or connector
• EPS control unit
• Fuse
• Power supply system
• 12V Battery

EPS control unit

Continuity

Connector

Terminal

M38

10

Ground

Yes

STC-24

< DTC/CIRCUIT DIAGNOSIS >

C1601 BATTERY POWER SUPPLY

2. Turn power switch ON.

CAUTION:

Never set the vehicle to READY.

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 power switch OFF.

2. Check the 10A fuse (#3).

3. Check the harness for open or short between EPS control unit harness connector M37 terminal 4 and the

10A fuse (#3).

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power switch ON power supply. Refer to 

PG-15, "Wiring Dia-

gram — Battery Power Supply —"

.

NO

>> Repair or replace malfunctioning parts.

4.

CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (3)

1. Turn power switch OFF.

2. Check voltage between EPS control unit harness connector terminals and ground.

3. Turn power switch ON.

CAUTION:

Never set the vehicle to READY.

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 power switch OFF.

2. Check the 60A fusible link (N).

3. Check the harness for open or short between EPS control unit harness connector M38 terminal 9 and the

60A fusible link (N).

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for 12V battery power supply. Refer to 

PG-15, "Wiring Diagram —

Battery Power Supply —"

.

EPS control unit

Voltage

(Approx.)

Connector

Terminal

M37

4

Ground

 0 V

EPS control unit

Voltage

(Approx.)

Connector

Terminal

M37

4

Ground

Battery voltage

EPS control unit

Voltage

(Approx.)

Connector

Terminal

M38

9

Ground

Battery voltage

EPS control unit

Voltage

(Approx.)

Connector

Terminal

M38

9

Ground

Battery voltage

 

 

 

 

 

 

 

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