Nissan Leaf. Manual - part 265

C1AA9 PRESSURE SENSOR

BR-381

< DTC/CIRCUIT DIAGNOSIS >

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2. Repeat step 1 two or more times.

CAUTION:

Be sure to wait for 5 seconds or more after turning the power switch OFF.

3. Turn the power switch OFF to exit CONSULT, and disconnect CONSULT from data link connector.

4. Close all doors (including back door), check that the room lamp is OFF, get out of the vehicle, and wait for

3 minutes or more with all doors closed.

CAUTION:

Never operate the vehicle while waiting.

5. Turn the power switch ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

6. Start CONSULT and erase self-diagnosis result of “BRAKE”.

7. Turn the power switch OFF to exit CONSULT, and disconnect CONSULT from data link connector.

8. Close all doors (including back door), check that the room lamp is OFF, get out of the vehicle, and wait for

3 minutes or more with all doors closed.

CAUTION:

Never operate the vehicle while waiting.

9. Turn the power switch ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

10. Depress brake pedal by 100 mm (3.94 in) or more, and hold the position for 5 seconds or more.

11. Release brake pedal.

12. Start CONSULT and perform “BRAKE” self-diagnosis.
Is DTC “C1AA9” detected?

YES

>> GO TO 15.

NO

>> INSPECTION END

15.

CHECK MASTER CYLINDER PRESSURE SENSOR INSTALLATION

1. Turn the power switch OFF to exit CONSULT.

2. Check the master cylinder pressure sensor for looseness and disconnection. Refer to 

BR-510, "Exploded

View"

.

Is the inspection result normal?

YES

>> GO TO 16.

NO

>> Repair or replace error-detected parts and GO TO 16.

16.

PERFORM SELF-DIAGNOSIS (7)

With CONSULT

1. Turn the power switch OFF to ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

2. Repeat step 1 two or more times.

CAUTION:

Be sure to wait for 5 seconds or more after turning the power switch OFF.

3. Turn the power switch OFF to exit CONSULT, and disconnect CONSULT from data link connector.

4. Close all doors (including back door), check that the room lamp is OFF, get out of the vehicle, and wait for

3 minutes or more with all doors closed.

CAUTION:

Never operate the vehicle while waiting.

5. Turn the power switch ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

6. Start CONSULT and erase self-diagnosis result of “BRAKE”.

7. Turn the power switch OFF to exit CONSULT, and disconnect CONSULT from data link connector.

8. Close all doors (including back door), check that the room lamp is OFF, get out of the vehicle, and wait for

3 minutes or more with all doors closed.

CAUTION:

Never operate the vehicle while waiting.

9. Turn the power switch ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

BR-382

< DTC/CIRCUIT DIAGNOSIS >

C1AA9 PRESSURE SENSOR

10. Depress brake pedal by 100 mm (3.94 in) or more, and hold the position for 5 seconds or more.

11. Release brake pedal.

12. Start CONSULT and perform “BRAKE” self-diagnosis.
Is DTC “C1AA9” detected?

YES

>> GO TO 17.

NO

>> INSPECTION END

17.

CHECK MASTER CYLINDER PRESSURE SENSOR CIRCUIT

1. Turn the power switch OFF to exit CONSULT.

2. Disconnect master cylinder pressure sensor harness connector.

3. Disconnect the ABS actuator and electric unit (control unit) harness connector.

4. Check the continuity between master cylinder pressure sensor harness connector and ABS actuator and

electric unit (control unit) harness connector harness connector. Refer to 

BRC-107, "Diagnosis Proce-

dure"

.

Is the inspection result normal?

YES

>> GO TO 18.

NO

>> Repair or replace error-detected parts and GO TO 20.

18.

CHECK MASTER CYLINDER PRESSURE SENSOR POWER CIRCUIT

Check the master cylinder pressure sensor power voltage. Refer to 

BRC-107, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 19.

NO

>> Repair or replace error-detected parts and GO TO 20.

19.

CHECK DATA MONITOR (2)

With CONSULT

1. Turn the power switch OFF to exit CONSULT, and disconnect CONSULT from data link connector.

2. Connect master cylinder pressure sensor harness connector.

3. Connect ABS actuator and electric unit (control unit) harness connector.

4. Close all doors (including back door), check that the room lamp is OFF, get out of the vehicle, and wait for

3 minutes or more with all doors closed.

CAUTION:

Never operate the vehicle while waiting.

5. Disconnect 12V battery cable from negative terminal. Refer to 

BR-6, "Precaution for Removing 12V Bat-

tery"

.

6. Connect 12V battery cable to negative terminal.

7. Turn the power switch OFF to ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

8. Repeat step 7 two or more times.

CAUTION:

Be sure to wait for 5 seconds or more after turning the power switch OFF.

9. Start CONSULT and select “BRAKE” and “DATA MONITOR” according this order.

10. Check the “MASTER CYL PRESSURE”. Refer to 

BR-33, "Reference Value"

.

Is the inspection result normal?

YES

>> GO TO 20.

NO

>> Check the ABS actuator and electric unit (control unit). Refer to 

BRC-46, "CONSULT Function"

.

20.

PERFORM SELF-DIAGNOSIS (8)

With CONSULT

1. Connect master cylinder pressure sensor harness connector.

2. Connect ABS actuator and electric unit (control unit) harness connector.

3. Turn the power switch OFF to ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

4. Repeat step 3 two or more times.

CAUTION:

Be sure to wait for 5 seconds or more after turning the power switch OFF.

5. Turn the power switch OFF to exit CONSULT, and disconnect CONSULT from data link connector.

C1AA9 PRESSURE SENSOR

BR-383

< DTC/CIRCUIT DIAGNOSIS >

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6. Close all doors (including back door), check that the room lamp is OFF, get out of the vehicle, and wait for

3 minutes or more with all doors closed.

CAUTION:

Never operate the vehicle while waiting.

7. Turn the power switch ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

8. Start CONSULT and erase self-diagnosis result of “BRAKE”.

9. Turn the power switch OFF to exit CONSULT, and disconnect CONSULT from data link connector.

10. Close all doors (including back door), check that the room lamp is OFF, get out of the vehicle, and wait for

3 minutes or more with all doors closed.

CAUTION:

Never operate the vehicle while waiting.

11. Turn the power switch ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

12. Depress brake pedal by 100 mm (3.94 in) or more, and hold the position for 5 seconds or more.

13. Release brake pedal.

14. Start CONSULT and perform “BRAKE” self-diagnosis.
Is DTC “C1AA9” detected?

YES

>> GO TO 21.

NO

>> INSPECTION END

21.

CHECK MASTER CYLINDER PRESSURE SENSOR

1. Disconnect master cylinder pressure sensor harness connector.

2. Check that the voltage between master cylinder pressure sensor harness connector changes with the

depth of pedal depression.

Is the inspection result normal?

YES

>> Replace the electrically-driven intelligent brake unit. Refer to 

BR-510, "Removal and installation"

.

NO

>> Check the ABS actuator and electric unit (control unit). Refer to 

BRC-46, "CONSULT Function"

.

BR-384

< DTC/CIRCUIT DIAGNOSIS >

C1AB8 MOTOR

C1AB8 MOTOR

DTC Logic

INFOID:0000000010123077

DTC DETECTION LOGIC

DTC REPRODUCTION 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.

CHECK DTC DETECTION

With CONSULT

1. Turn the power switch OFF to ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

2. Repeat step 1 two or more times.

CAUTION:

Be sure to wait for 5 seconds or more after turning the power switch OFF.

3. Turn the power switch OFF to exit CONSULT, and disconnect CONSULT from data link connector.

4. Close all doors (including back door), check that the room lamp is OFF, get out of the vehicle, and wait for

3 minutes or more with all doors closed.

CAUTION:

Never operate the vehicle while waiting.

5. Turn the power switch ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

6. Start CONSULT and erase self-diagnosis result of “BRAKE”.

7. Turn the power switch OFF to exit CONSULT, and disconnect CONSULT from data link connector.

8. Close all doors (including back door), check that the room lamp is OFF, get out of the vehicle, and wait for

3 minutes or more with all doors closed.

CAUTION:

Never operate the vehicle while waiting.

9. Turn the power switch ON without depressing the brake pedal.

CAUTION:

Never set the vehicle to READY.

10. Depress brake pedal by 100 mm (3.94 in) or more, and hold the position for 5 seconds or more.

11. Release brake pedal.

12. Start CONSULT and perform “BRAKE” self-diagnosis.
Is DTC “C1AB8” detected?

YES

>> Proceed to 

BR-385, "Diagnosis Procedure"

.

NO

>> INSPECTION END

DTC

Display item

Malfunction detection condition

Possible causes

C1AB8

MOTOR-2

• Temperature of motor that is integrated with electri-

cally-driven intelligent brake unit is as shown below.

- Motor temperature: 

−50°C (−122°F) ≥ Motor tem-

perature

- Motor temperature: 115

°C (239°F) ≤ Motor temper-

ature

• A malfunction is detected in the temperature detec-

tion circuit of the motor that is integrated with the 
electrically-driven intelligent brake unit.

Electrically-driven intelligent 
brake unit