Diagnostic Test

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

CHECK BRAKE FLUID LEVEL
1. Turn the ignition switch OFF.
2. Check the brake fluid level. Refer to INSPECTION .
Is the inspection result normal?

YES

GO TO STEP 3 .

NO

Refill brake fluid. Refer to REFILLING . GO TO STEP 2 .

PERFORM SELF-DIAGNOSIS (1)

With CONSULT
1. Erase self-diagnosis result for "ABS".
2. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
3. Set the vehicle to READY/Start the engine.
  NOTE:
  Wait at least 10 seconds after set the vehicle to READY/start the engine.
4. Repeat step 2 to 3 two or more times.
5. Perform self-diagnosis for "ABS".
Is DTC "C1155" detected?

YES

GO TO STEP 3 .

NO

INSPECTION END

CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Check the brake fluid level switch harness connector for disconnection or looseness.
3. Check the combination meter harness connector for disconnection or looseness.
Is the inspection result normal?

YES

GO TO STEP 5 .

NO

Repair / replace harness or connector, and GO TO STEP 4 .

PERFORM SELF-DIAGNOSIS (2)

With CONSULT
1. Turn the ignition switch OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF.
2. Set the vehicle to READY/Start the engine.
  NOTE:
  Wait at least 10 seconds after set the vehicle to READY/start the engine.
3. Repeat step 1 to 2 two or more times.
4. Perform self-diagnosis for "ABS".
Is DTC "C1155" detected?

YES

GO TO STEP 5 .

NO

INSPECTION END

CHECK BRAKE FLUID LEVEL SWITCH

Check the brake fluids level switch. Refer to COMPONENT INSPECTION .

Is the inspection result normal?

YES

GO TO STEP 7 .

NO

Replace the electrically-driven intelligent brake unit. Refer to REMOVAL AND INSTALLATION . GO TO STEP 6 .

PERFORM SELF-DIAGNOSIS (3)

With CONSULT
1. Erase self-diagnosis result for "ABS".
2. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
3. Set the vehicle to READY/Start the engine.
  NOTE:
  Wait at least 10 seconds after set the vehicle to READY/start the engine.
4. Repeat step 2 to 3 two or more times.
5. Perform self-diagnosis for "ABS".
Is DTC "C1155" detected?

YES

GO TO STEP 7 .

NO

INSPECTION END

CHECK CONNECTOR AND TERMINAL
1. Turn the ignition switch OFF.
2. Disconnect brake fluid level switch harness connector.
3. Check the brake fluid level switch harness connector for disconnection or looseness.
4. Check the brake fluid level switch pin terminals for damage or loose connection with harness connector.
5. Disconnect combination meter harness connector.
6. Check the combination meter harness connector for disconnection or looseness.
7. Check the combination meter pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

GO TO STEP 9 .

NO

Repair / replace harness, connector, or terminal, and GO TO STEP 8 .

PERFORM SELF-DIAGNOSIS (4)

With CONSULT
1. Connect brake fluid level switch harness connector.
2. Connect combination meter harness connector.
3. Erase self-diagnosis result for "ABS".
4. Turn the ignition switch OFF → ON → OFF.
  NOTE:
  Wait at least 10 seconds after turning ignition switch OFF or ON.
5. Set the vehicle to READY/Start the engine.
  NOTE:
  Wait at least 10 seconds after set the vehicle to READY/start the engine.
6. Repeat step 4 to 5 two or more times.
7. Perform self-diagnosis for "ABS".
Is DTC "C1155" detected?

YES

GO TO STEP 9 .

NO

INSPECTION END

CHECK BRAKE FLUID LEVEL SWITCH CIRCUIT (1)

Turn the ignition switch OFF.
Disconnect brake fluid level switch harness connector.
Disconnect combination meter harness connector.

Check the continuity between brake fluid level switch harness connector and combination meter harness connector.

Brake fluid level switch		Combination meter		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E4	1	M57	25	Existed

Check the continuity between brake fluid level switch harness connector and ground.

Brake fluid level switch		-	Continuity
Connector	Terminal	-	Continuity
E4	1	Ground	Not existed

Is the inspection result normal?

YES

GO TO STEP 10 .

Repair / replace harness or connector, and GO TO STEP 10 .

CHECK BRAKE FLUID LEVEL SWITCH GROUND CIRCUIT

Check the continuity between brake fluid level switch harness connector and ground.

Brake fluid level switch		-	Continuity
Connector	Terminal	-	Continuity
E4	2	Ground	Existed

Is the inspection result normal?

YES

GO TO STEP 11 .

Repair / replace harness or connector, and GO TO STEP 11 .

CHECK COMBINATION METER
1. Connect brake fluid level switch harness connector.
2. Connect combination meter harness connector.
3. Check the combination meter. Refer to ON BOARD DIAGNOSIS FUNCTION .
Is the inspection result normal?

YES

Replace the ABS actuator and electric unit (control unit). Refer to REMOVAL AND INSTALLATION

NO

Repair or replace combination meter. Refer to REMOVAL AND INSTALLATION .