Nissan Sentra B18 (2020-2025) Service Manual: C1051-04 Pump Motor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen item (Trouble diagnosis content)		DTC detection condition
C1051-04	Pump motor (Pump motor)	—	Diagnosis condition	When ignition switch is ON. When the power supply voltage is normal.
			Signal (terminal)	—
			Threshold	When a malfunction is detected in motor or motor relay.
			Diagnosis delay time	12 second or less

POSSIBLE CAUSE

Note:

Confirm if DTC is PAST or CRNT. If DTC is CRNT, proceed with Diagnosis Procedure. If DTC is PAST, clear DTC. Do not replace the ABS actuator and electric unit (control unit) for a PAST DTC.

PAST DTC	CRNT DTC
Harness or connector ABS actuator and electric unit (control unit) power supply system Fuse Fusible link 12V battery	Harness or connector ABS actuator and electric unit (control unit) ABS actuator and electric unit (control unit) power supply system Fuse Fusible link 12V battery

FAIL-SAFE

The following functions are suspended:

• VDC function

• TCS function

• ABS function

• EBD function

• Brake assist function

• Hill start assist function

Confirmation Procedure

Confirmation Procedure

1. PRECONDITIONING

   1. If “Confirmation Procedure” has been previously conducted, always place the ignition switch in the OFF position and wait at least 10 seconds before conducting the next test.

   >>

   GO TO 2.

2. CHECK DTC DETECTION

   1. CONSULT

      1. Ignition switch OFF → ON, and wait 30 seconds.

      2. Drive the Nissan Sentra vehicle at approx. 31 MPH (50 km/h) or more for approx. 2 minutes.

      3. Stop the vehicle.

      4. Ignition switch OFF.

         Note:

         Wait at least 10 seconds after placing ignition switch in the OFF position.

      5. Start the engine.

         Note:

         Wait at least 10 seconds after start the engine.

      6. Select "Self Diagnostic Result" mode of "ABS".

   Is DTC “C1051-04” detected?

   YES >>

   “CRNT” is displayed: Refer to DTC Diagnosis Procedure.

   YES >>

   “PAST” is displayed: Inspection End. (Erase "Self Diagnostic Result" mode of "ABS".)

   NO >>

   To check malfunction symptom before repair: Refer to Intermittent Incident.

   NO >>

   Confirmation after repair: Inspection End.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

1. CHECK CONNECTOR

   1. 1. Ignition switch OFF.

      2. Check the ABS actuator and electric unit (control unit) harness connector for disconnection or looseness.

   Is the inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   Repair / replace harness or connector, securely lock the connector, and GO TO 2.

2. PERFORM SELF DIAGNOSTIC RESULT

   1. CONSULT

      1. Ignition switch OFF → ON, and wait 30 seconds.

      2. Drive the Nissan Sentra vehicle at approx. 31 MPH (50 km/h) or more for approx. 2 minutes.

         Note:

         Nissan Sentra Vehicle must be driven after repair or replacement to erase the previous DTCs.

      3. Stop the vehicle.

      4. Ignition switch OFF.

         Note:

         Wait at least 10 seconds after placing ignition switch in the OFF position.

      5. Start the engine.

         Note:

         Wait at least 10 seconds after start the engine.

      6. Select "Self Diagnostic Result" mode of "ABS".

   Is DTC “C1051-04” detected?

   YES >>

   GO TO 3.

   NO >>

   Inspection End.

3. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY AND GROUND CIRCUIT

   1. Check the ABS actuator and electric unit (control unit) power supply and ground circuit. Refer to Diagnosis Procedure.

   Is the inspection result normal?

   YES>>

   GO TO 5.

   NO>>

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

4. ERASE SELF DIAGNOSTIC RESULT (1)

   1. CONSULT

      1. Drive the Nissan Sentra vehicle at approx. 31 MPH (50 km/h) or more for approx. 2 minutes.

         Note:

         Nissan Sentra Vehicle must be driven after repair or replacement to erase the previous DTCs.

      2. Stop the vehicle.

      3. Erase "Self Diagnostic Result" mode of “ABS”.

      4. Ignition switch OFF → ON → OFF.

         Note:

         Wait at least 10 seconds after placing ignition switch in the OFF or ON position.

   >>

   Inspection End.

5. CHECK TERMINAL

   1. 1. Ignition switch OFF.

      2. 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 >>

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

   NO >>

   Repair / replace harness or connector, and GO TO 6.

6. ERASE SELF DIAGNOSTIC RESULT (2)

   1. CONSULT

      1. Drive the Nissan Sentra vehicle at approx. 31 MPH (50 km/h) or more for approx. 2 minutes.

         Note:

         Nissan Sentra Vehicle must be driven after repair or replacement to erase the previous DTCs.

      2. Stop the vehicle.

      3. Erase "Self Diagnostic Result" mode of “ABS”.

      4. Ignition switch OFF → ON → OFF.

         Note:

         Wait at least 10 seconds after placing ignition switch in the OFF or ON position.

   >>

   Inspection End.