Nissan Leaf. Manual - part 992

PCS

DIAGNOSIS AND REPAIR WORK FLOW

PCS-51

< BASIC INSPECTION >

[POWER DISTRIBUTION SYSTEM]

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1.

GET INFORMATION FOR SYMPTOM

1. Get detailed information from the customer about the symptom (the condition and the environment when

the incident/malfunction occurs).

2. Check operation condition of the function that is malfunctioning.

>> GO TO 2.

2.

CHECK DTC

1. Check DTC.

2. Perform the following procedure if DTC is detected.

-

Record DTC and freeze frame data (Print them out using CONSULT.)

-

Erase DTC.

-

Study the relationship between the cause detected by DTC and the symptom described by the customer.

3. Check related service bulletins for information.
Are any symptoms described and any DTC detected?

Symptom is described, DTC is detected>>GO TO 3.

Symptom is described, DTC is not detected>>GO TO 4.

Symptom is not described, DTC is detected>>GO TO 5.

3.

CONFIRM THE SYMPTOM

Try to confirm the symptom described by the customer.

Also study the normal operation and fail-safe related to the symptom.

Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 5.

4.

CONFIRM THE SYMPTOM

Try to confirm the symptom described by the customer.

Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 6.

5.

PERFORM DTC CONFIRMATION PROCEDURE

Perform DTC CONFIRMATION PROCEDURE for the detected DTC, and then check that DTC is detected

again. At this time, always connect CONSULT to the vehicle, and check self diagnostic results in real time.

If two or more DTCs are detected, refer to 

BCS-47, "DTC Inspection Priority Chart"

, and determine trouble

diagnosis order.

NOTE:

• Freeze frame data is useful if the DTC is not detected.

• Perform Component Function Check if DTC CONFIRMATION PROCEDURE is not included in Service Man-

ual. This simplified check procedure is an effective alternative though DTC cannot be detected during this

check.

If the result of Component Function Check is NG, it is the same as the detection of DTC by DTC CONFIR-

MATION PROCEDURE.

Is DTC detected?

YES

>> GO TO 7.

NO

>> Check according to 

GI-53, "Intermittent Incident"

.

6.

DETECT MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS

Detect malfunctioning system according to SYMPTOM DIAGNOSIS based on the confirmed symptom in step

4, and determine the trouble diagnosis order based on possible causes and symptom.
Is the symptom described?

YES

>> GO TO 7.

NO

>> Monitor input data from related sensors or check voltage of related module terminals using CON-

SULT.

7.

DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE

PCS-52

< BASIC INSPECTION >

[POWER DISTRIBUTION SYSTEM]

DIAGNOSIS AND REPAIR WORK FLOW

Inspect according to Diagnostic Procedure of the system.
Is malfunctioning part detected?

YES

>> GO TO 8.

NO

>> Check according to 

GI-53, "Intermittent Incident"

.

8.

REPAIR OR REPLACE THE MALFUNCTIONING PART

1. Repair or replace the malfunctioning part.

2. Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-

ment.

3. Check DTC. If DTC is detected, erase it.

>> GO TO 9.

9.

FINAL CHECK

When DTC is detected in step 2, perform DTC CONFIRMATION PROCEDURE again, and then check that the

malfunction is repaired securely.

When symptom is described by the customer, refer to confirmed symptom in step 3 or 4, and check that the

symptom is not detected.
Is DTC detected and does symptom remain?

YES-1 >> DTC is detected: GO TO 7.

YES-2 >> Symptom remains: GO TO 4.

NO

>> Before returning the vehicle to the customer, always erase DTC.

PCS

B2614 ACC RELAY CIRCUIT

PCS-53

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

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DTC/CIRCUIT DIAGNOSIS

B2614 ACC RELAY CIRCUIT

DTC Logic

INFOID:0000000010120317

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn power switch to ACC, and wait for 1 second or more.

2. Perform Self Diagnostic Result of BCM with CONSULT. 
Is DTC B2614 detected?

YES

>> Go to 

PCS-53, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010120318

Regarding Wiring Diagram information, refer to 

PCS-42, "Wiring Diagram"

.

1.

CHECK ACCESSORY RELAY CONTROL SIGNAL

Check voltage between BCM connector M23 and ground.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-72, "Removal and Installation"

.

NO

>> GO TO 2.

2.

CHECK ACCESSORY RELAY CONTROL SIGNAL CIRCUIT

1. Turn power switch OFF.

2. Disconnect BCM connector M23.

3. Remove accessory relay.

4. Check continuity between BCM connector M23 and accessory relay.

5. Check continuity between BCM connector M23 and ground.

CONSULT Display

DTC Detection Condition

Possible Cause

ACC RELAY REQ F/B
[B2614]

The following status is compared, and does not 
agree for 1 second or more.
• State of accessory relay control judgment in 

BCM

• State of accessory relay control signal

• Harness or connectors (Accessory relay con-

trol signal circuit)

• BCM
• Accessory relay

BCM

Ground

Condition

Voltage

(Approx.)

Connector

Terminal

M23

96

—

Power switch OFF

0 - 0.5

Power switch ACC or ON

Battery voltage

BCM

Accessory relay

Continuity

Connector

Terminal

Terminal

M23

96

Coil upstream side

Yes

BCM

Ground

Continuity

Connector

Terminal

M23

96

—

No

PCS-54

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B2614 ACC RELAY CIRCUIT

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness or connectors.

3.

CHECK ACCESSORY RELAY

Perform the accessory relay component inspection. Refer to 

PCS-54, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-72, "Removal and Installation"

.

NO

>> Replace accessory relay.

Component Inspection

INFOID:0000000010120319

1.

CHECK ACCESSORY RELAY

1. Turn power switch OFF.

2. Remove accessory relay.

3. Check continuity between accessory relay terminals.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace accessory relay.

Accessory relay terminals

Condition

Continuity

3 and 5

Battery voltage applied to 
terminal 1 and ground to 
terminal 2

Yes

Voltage and ground re-
moved

No

PBIB0098E