Nissan Sentra B18 (2020-2025) Service Manual: B2c20-23 Starter Cut Relay

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detecting condition
B2C20-23	Starter cut relay (Starter cut relay)	Diagnosis condition	Ignition switch ON
		Signal (terminal)	Starter cut relay signal Starter cut relay status signal (CAN)
		Threshold	When the starter cut relay status signal transmitted from IPDM E/R via CAN communication is OFF after even though BCM is operating the starter cut relay ON output.
		Diagnosis delay time	1 second or less

POSSIBLE CAUSE

• Harness or connectors

  (The CAN communication line is open or shorted)

• Harness or connectors

  (Starter cut relay circuit is short to ground or open)

• Starter cut relay

FAIL-SAFE

—

Confirmation Procedure

Confirmation Procedure

1. PERFORM DTC CONFIRMATION PROCEDURE

   1. 1. Ignition switch ON under the following conditions and wait 1 second or more:

         • CVT models

           • Selector lever: In the P position.

           • Brake pedal: Depressed.

         • M/T models

           • Shift lever: In the neutral position.

           • Clutch pedal or Brake pedal: Depressed.

      2. CONSULT

         Select “Self Diagnostic Result” mode of “BCM”.

   Is the DTC detected?

   YES>>

   Refer to DTC Diagnosis Procedure.

   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 STARTER CUT RELAY INPUT SIGNAL

   1. Check voltage between BCM harness connector and ground.

      (+)		(-)	Condition	Voltage (Approx.)
      BCM
      Connector	Terminal
      M142	123	Ground	At engine cranking	0 V
      			Other than above	Battery voltage

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   GO TO 2.

2. CHECK STARTER CUT RELAY INPUT SIGNAL CIRCUIT

   1. 1. Ignition switch OFF.

      2. Disconnect BCM connector and starter cut relay connector.

      3. Check continuity between BCM harness connector and starter cut relay harness connector.

         BCM		Starter cut relay		Continuity
         Connector	Terminal	Connector	Terminal
         M142	123	H-2	2	Yes

      4. Check continuity between BCM harness connector and ground.

         BCM		—	Continuity
         Connector	Terminal
         M142	123	Ground	No

   Is the inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   Repair or replace harness.

3. CHECK FUSIBLE LINK

   1. Check that the following fusible link is not blown (open):

      Signal name	Fusible link No.	Capacity
      Battery power supply	M	30 A

   Is the fusible link blown (open)?

   YES >>

   Replace the blown (open) fusible link after repairing the affected circuit if a fusible link is blown (open).

   NO >>

   GO TO 6.

4. CHECK STARTER CUT RELAY OUTPUT SIGNAL

   1. Check voltage between IPDM E/R harness connector and ground.

      (+)		(-)	Condition	Voltage (Approx.)
      IPDM E/R
      Connector	Terminal
      F97	86	Ground	Other than at engine cranking	0 - 1 V
      			At engine cranking	Battery voltage

   Is the inspection result normal?

   YES >>

   Inspection End.

   NO >>

   GO TO 5.

5. CHECK STARTER CUT RELAY OUTPUT SIGNAL CIRCUIT

   1. 1. Ignition switch OFF.

      2. Disconnect IPDM E/R connector and starter cut relay connector.

      3. Check continuity between IPDM E/R harness connector and starter cut relay harness connector.

         IPDM E/R		Starter cut relay		Continuity
         Connector	Terminal	Connector	Terminal
         F97	86	H-2	5	Yes

      4. Check continuity between IPDM E/R harness connector and ground.

         IPDM E/R		—	Continuity
         Connector	Terminal
         F97	86	Ground	No

   Is the inspection result normal?

   YES >>

   GO TO 6.

   NO >>

   Repair or replace harness.

6. CHECK STARTER CUT RELAY

   1. Check starter cut relay. Refer to Component Inspection.

   Is the inspection result normal?

   YES >>

   Inspection End.

   NO >>

   Replace starter cut relay.