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

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

Diagnosis Procedure

Diagnosis Procedure

CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
  - Data link connector
  - 8CH CAN gateway
Is the inspection result normal?
YES >>
GO TO 2.
NO >>
Repair the terminal and connector.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Disconnect the connector of 8CH CAN gateway.

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

8CH CAN gateway harness connector			Continuity
Connector No.	Terminal No.
M37	13	29	Existed
	14	30	Existed

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

Check the harness and repair or replace 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	13	14	Not existed

Is the inspection result normal?

YES >>

GO TO 4.

NO >>

Check the harness and repair or replace 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	13		Not existed
	14		Not existed

Is the inspection result normal?

YES >>

GO TO 5.

NO >>

Check the harness and repair or replace the root cause.

CHECK TERMINATION CIRCUIT

Remove the 8CH CAN gateway.

Check the resistance between the 8CH CAN gateway terminals.

8CH CAN gateway		Resistance (Ω)
Terminal No.
13	14	Approx. 108 – 132
29	30	Approx. 108 – 132

Is the measurement value within the specification?

YES (Present error) >>

Check CAN system type decision again.

YES (Past error) >>

Error was detected in the diagnostic CAN communication circuit.

NO >>

Replace the 8CH CAN gateway.

Lan System :: Can Gateway

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