Nissan Leaf. Manual - part 546

EVC-208

< DTC/CIRCUIT DIAGNOSIS >

P1805 BRAKE SWITCH

P1805 BRAKE SWITCH

DTC Logic

INFOID:0000000010120660

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

NOTE:

Since this DTC is difficult to be confirmed, check component function to judge the normality.

>> Proceed to 

EVC-208, "Component Function Check"

.

Component Function Check

INFOID:0000000010120661

1.

CHECK BRAKE SWITCH FUNCTION

 With CONSULT

1. On the CONSULT screen, select “EV/HEV” >> “DATA MONITOR” >> “STOP LAMP SW”.

2. Check “STOP LAMP SW” indication under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EVC-208, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010120662

1.

CHECK STOP LAMP SWITCH OPERATION

1. Turn power switch OFF.

2. Check the stop lamp when depressing and releasing the brake pedal.

Is the inspection result normal?

YES

>> GO TO 5. 

NO

>> GO TO 2.

2.

CHECK STOP LAMP SWITCH 

Check stop lamp switch. Refer to 

EVC-209, "Component Inspection (Stop Lamp Switch)"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace stop lamp switch. Refer to 

BR-500, "Exploded View"

.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1805

BRAKE SWITCH
(Brake switch)

Stop lamp signal is not sent to VCM for ex-
tremely long time while the vehicle is driving.

• Harness or connectors

(Stop lamp switch circuit is open or 
shorted.)

• Stop lamp switch

Monitor item

Condition

Indication

STOP LAMP SW

Brake pedal

Slightly depressed

ON

Fully released

OFF

Brake pedal

Stop lamp

Fully released

OFF

Slightly depressed

ON

P1805 BRAKE SWITCH

EVC-209

< DTC/CIRCUIT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

EVC

N

O

P

3.

CHECK STOP LAMP SWITCH POWER SUPPLY

1. Disconnect stop lamp switch harness connector.

2. Check the voltage between stop lamp switch harness connector and ground.

3. Also check harness for short to ground.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1. Pull out #77 fuse.

2. Check that the fuse is not fusing.

3. Check the continuity between stop lamp switch harness connector and fuse terminal.

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> Perform trouble diagnosis for 12V battery power supply circuit.

NO

>> Repair or replace error-detected parts.

5.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT

1. Disconnect stop lamp switch harness connector.

2. Disconnect VCM harness connector.

3. Check the continuity between stop lamp switch harness connector and VCM harness connector.

4. Also check harness for short to ground.
Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

NO

>> Repair or replace error-detected parts.

Component Inspection (Stop Lamp Switch)

INFOID:0000000010120663

1.

CHECK STOP LAMP SWITCH-1

1. Turn power switch OFF.

2. Disconnect stop lamp switch harness connector.

3. Check the continuity between stop lamp switch terminals under the following conditions.

+

−

Voltage

Stop lamp switch

Connector

Terminal

E102

3

Ground

Battery voltage

+

−

Continuity

Stop lamp switch

Connector

Terminal

E102

3

#77 fuse 

terminal

Existed

+

−

Continuity

Stop lamp switch

VCM

Connector

Terminal

Connector

Terminal

E102

4

E62

101

Existed

EVC-210

< DTC/CIRCUIT DIAGNOSIS >

P1805 BRAKE SWITCH

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK STOP LAMP SWITCH-2

1. Adjust stop lamp switch installation. Refer to 

BR-501, "Inspection and Adjustment"

.

2. Check the continuity between stop lamp switch terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace stop lamp switch. Refer to 

BR-500, "Exploded View"

.

Terminals

Condition

Continuity

3 and 4

Brake pedal

Fully released

Not existed

Slightly depressed

Existed

Terminals

Condition

Continuity

3 and 4

Brake pedal

Fully released

Not existed

Slightly depressed

Existed

P2122, P2123 APP SENSOR

EVC-211

< DTC/CIRCUIT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

EVC

N

O

P

P2122, P2123 APP SENSOR

DTC Logic

INFOID:0000000010120664

DTC DETECTION LOGIC

NOTE:

If DTC P2122 or P2123 is displayed with DTC P31E5, first perform the trouble diagnosis for DTC P31E5.

Refer to 

EVC-351, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

• Turn power switch OFF and wait at least 90 seconds.

CAUTION:

During this period, never perform vehicle handling such as opening and closing of doors. If some

kind of vehicle handling is performed, then wait another 90 seconds or more from the time of the

vehicle handling.

• Make sure that 12V battery voltage is 11 V or more.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn power switch ON and wait at least 1 second.

2. Check self-diagnostic result.
Is DTC detected?

YES

>> Proceed to 

EVC-211, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010120665

1.

CHECK APP SENSOR 1 POWER SUPPLY-1

1. Turn power switch OFF.

2. Disconnect accelerator pedal position (APP) sensor harness connector.

3. Turn power switch ON.

4. Check the voltage between APP sensor harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 2.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P2122

APP SENSOR D
(Throttle/Pedal position 
sensor/switch “D” circuit 
low)

An excessively low voltage from the accelerator 
pedal position sensor 1 is sent to VCM.

• Harness or connectors

(APP sensor 1 circuit is open or 
shorted.)

• Accelerator pedal position sensor 

1

P2123

APP SENSOR D
(Throttle/Pedal position 
sensor/switch “D” circuit 
high)

An excessively high voltage from the accelerator 
pedal position sensor 1 is sent to VCM.

APP sensor

Voltage

(Approx.)

Connector

+

−

Terminal

E101

3

5

5 V