Nissan Sentra B18 (2020-2025) Service Manual: C1073-01 Vacuum Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen item (Trouble diagnosis content)		DTC detection condition
C1073-01	Vacuum sensor (Vacuum sensor)	—	1	Diagnosis condition	When ignition switch is ON. When the power supply voltage is normal.
				Signal (terminal)	Vacuum sensor signal
				Threshold	When an open circuit is detected in vacuum sensor circuit.
				Diagnosis delay time	1 second or less
			2	Diagnosis condition	When ignition switch is ON. When the power supply voltage is normal.
				Signal (terminal)	Vacuum sensor signal
				Threshold	When a short circuit is detected in vacuum sensor circuit.
				Diagnosis delay time	1 second or less
			3	Diagnosis condition	When ignition switch is ON. When the power supply voltage is normal.
				Signal (terminal)	Vacuum sensor signal
				Threshold	When a malfunction is detected in vacuum sensor noise.
				Diagnosis delay time	1 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 Vacuum sensor (vacuum piping) 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:

• Brake 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.

         Note:

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

      2. Start the engine.

         Note:

         Wait at least 10 seconds after start the engine.

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

   Is DTC “C1073-01” 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 vacuum sensor harness connector for disconnection or looseness.

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

   Is the inspection result normal?

   YES >>

   GO TO 2.

   NO >>

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

2. CHECK TERMINAL

   1. 1. Ignition switch OFF.

      2. Disconnect vacuum sensor harness connector.

      3. Check the vacuum sensor pin terminals for damage or loose connection with harness connector.

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

      5. 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 3.

   NO >>

   Repair / replace harness, connector, or terminal.

3. CHECK VACUUM SENSOR CIRCUIT

   1. 1. Ignition switch OFF.

      2. Disconnect vacuum sensor harness connector.

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

      4. Check the continuity between vacuum sensor harness connector and ABS actuator and electric unit (control unit) harness connector.

         Vacuum sensor		ABS actuator and electric unit (control unit)		Continuity
         Connector	Terminal	Connector	Terminal
         E31	1	E33	32	Yes
         	2		35
         	3		4

      5. Check the continuity between vacuum sensor harness connector and ground.

         Vacuum sensor		—	Continuity
         Connector	Terminal
         E31	1	Ground	No
         	2
         	3

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   Repair / replace harness or connector.

4. REPLACE VACUUM SENSOR

   1. CONSULT

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

      2. Replace the vacuum sensor.

         CAUTION:

         Always replace brake booster because vacuum sensor cannot be disassembled. Refer to Removal and Installation.

      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.

      5. Start engine.

         Note:

         Wait at least 10 seconds after start the engine.

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

   Is DTC “C1073-01” detected?

   YES >>

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

   NO >>

   Inspection End.