DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. 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 3.

NO

Refill brake fluid. Refer to Refilling . GO TO 2.
PERFORM SELF-DIAGNOSIS (1)
CONSULT
1. Erase "Self Diagnostic Result" mode of "ABS"
2. Turn the ignition switch OFF → ON → OFF.
  NOTE: Wait at least 10 seconds after turning ignition switch OFF or ON.
3. Start the engine.
  NOTE: Wait at least 10 seconds after starting the engine.
4. Perform "Self Diagnostic Result" mode of "ABS".
Is DTC "C1155" detected?

YES

GO TO 3.

NO

Inspection End.
CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Check the ABS actuator and electric unit (control unit) harness connector for disconnection or looseness.
3. Check the brake fluid level switch harness connector for disconnection or looseness.
Is the inspection result normal?

YES

GO TO 5.

NO

Repair / replace harness or connector, and GO TO 4.
PERFORM SELF-DIAGNOSIS (2)
CONSULT
1. Turn the ignition switch OFF.
  NOTE: Wait at least 10 seconds after turning ignition switch OFF.
2. Start the engine.
  NOTE: Wait at least 10 seconds after starting the engine.
3. Perform "Self Diagnostic Result" mode of "ABS".
Is DTC "C1155" detected?

YES

GO TO 5.

NO

Inspection End.
CHECK BRAKE FLUID LEVEL SWITCH
Check the brake fluid level switch. Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 7.

NO

Replace the reservoir tank. Refer to Removal and Installation . GO TO 6.
PERFORM SELF-DIAGNOSIS (3)
CONSULT
1. Erase "Self Diagnostic Result" mode of "ABS"
2. Turn the ignition switch OFF → ON → OFF.
  NOTE: Wait at least 10 seconds after turning ignition switch OFF or ON.
3. Start the engine.
  NOTE: Wait at least 10 seconds after starting the engine.
4. Perform "Self Diagnostic Result" mode of "ABS".
Is DTC "C1155" detected?

YES

GO TO 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 ABS actuator and electric unit (control unit) harness connector.
6. Check the ABS actuator and electric unit (control unit) harness connector for disconnection or looseness.
7. Check the ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

GO TO 9.

NO

Repair / replace harness, connector, or terminal, and GO TO 8.
PERFORM SELF-DIAGNOSIS (4)
CONSULT
1. Erase "Self Diagnostic Result" mode of "ABS"
2. Turn the ignition switch OFF → ON → OFF.
  NOTE: Wait at least 10 seconds after turning ignition switch OFF or ON.
3. Start the engine.
  NOTE: Wait at least 10 seconds after starting the engine.
4. Perform "Self Diagnostic Result" mode of "ABS".
Is DTC "C1155" detected?

YES

GO TO 9.

NO

Inspection End.

CHECK BRAKE FLUID LEVEL SWITCH CIRCUIT

Turn the ignition switch OFF.
Disconnect brake fluid level switch harness connector.
Disconnect ABS actuator and electric unit (control unit) harness connector.

Check the continuity between brake fluid level switch harness connector and ABS actuator and electric unit (control unit) harness connector.

Brake fluid level switch		ABS actuator and electric unit (control unit)		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E21	1	E125	13	Yes

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

Brake fluid level switch		--	Continuity
Connector	Terminal
E21	1	Ground	No

Is the inspection result normal?

YES

GO TO 10.

Repair / replace harness or connector, and GO TO 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
E21	2	Ground	Yes

Is the inspection result normal?

YES

Replace the ABS actuator and electric unit (control unit). Refer to Removal and Installation .

Repair / replace harness or connector.