Nissan Sentra B18 (2020-2025) Service Manual: Vehicle Can Communication 1 Circuit

Nissan Sentra B18 (2020-2025) Service Manual / Electrical & Power Control / Lan System :: Can / Dtc/circuit Diagnosis / Vehicle Can Communication 1 Circuit

Diagnosis Procedure

Diagnosis Procedure

CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Disconnect all the unit connectors on Nissan Sentra vehicle CAN communication 1 circuit.
4. Check terminals and connectors for damage, bend and loose connection.
Is the inspection result normal?
YES >>
GO TO 2.
NO >>
Repair the terminal and connector.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Check the continuity between the 8CH CAN gateway harness connector and the combination meter harness connector.

8CH CAN gateway harness connector		Combination meter harness connector		Continuity
Connector No.	Terminal No.	Connector No.	Terminal No.
M37	9	M24	18	Existed
	10		19	Existed

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

Check the harness and repair the root cause.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the 8CH CAN gateway harness connector terminals.

8CH CAN gateway harness connector			Continuity
Connector No.	Terminal No.
M37	9	10	Not existed

Is the inspection result normal?

YES >>

GO TO 4.

NO >>

Check the harness and repair the root cause.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the 8CH CAN gateway harness connector and the ground.

8CH CAN gateway harness connector		Ground	Continuity
Connector No.	Terminal No.
M37	9		Not existed
	10		Not existed

Is the inspection result normal?

YES >>

GO TO 5.

NO >>

Check the harness and repair the root cause.

CHECK ECM AND BCM TERMINATION CIRCUIT

Remove the ECM and the BCM.

Check the resistance between the ECM terminals.

ECM		Resistance (Ω)
Terminal No.
134	133	Approx. 108 – 132

Check the resistance between the BCM terminals.

BCM		Resistance (Ω)
Terminal No.
26	27	Approx. 108 – 132

Is the measurement value within the specification?

YES >>

GO TO 6.

NO >>

Replace the ECM and/or the BCM.

CHECK SYMPTOM

Connect all the connectors. Check if the symptoms described in the “Symptom (Results from interview with customer)” are reproduced.

Inspection result
Reproduced>>
GO TO 7.
Non-reproduced >>
Start the diagnosis again. Follow the trouble diagnosis procedure when past error is detected.
CHECK UNIT REPRODUCTION

Perform the reproduction test as per the following procedure for each unit.
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Disconnect one of the unit connectors of Nissan Sentra vehicle CAN communication 1 circuit.
  Note:
  ECM and BCM have a termination circuit. Check other units first.
4. Connect the battery cable to the negative terminal. Check if the symptoms described in the “Symptom (Results from interview with customer)” are reproduced.
  Note:
  Although unit-related error symptoms occur, do not confuse them with other symptoms.
Inspection result
Reproduced>>
Connect the connector. Check other units as per the above procedure.
Non-reproduced >>
Replace the unit whose connector was disconnected.

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