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

Nissan Sentra B18 (2020-2025) Service Manual: Tcm Branch Line Circuit (vehicle Can Communication 1 Circuit)

Diagnosis Procedure

Diagnosis Procedure

CHECK CONNECTOR
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).
  - TCM
  - IPDM E/R
Is the inspection result normal?
YES >>
GO TO 2.
NO >>
Repair the terminal and connector.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Disconnect the following harness connectors.
- TCM
- IPDM E/R

Check the continuity between the TCM harness connector and the IPDM E/R harness connector.

TCM harness connector		IPDM E/R harness connector		Continuity
Connector No.	Terminal No.	Connector No.	Terminal No.
F23	33	F98	87	Existed
	23		88	Existed

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

Repair the branch line between the TCM and IPDM E/R.

CHECK IPDM E/R (OPEN CIRCUIT)

Check the continuity between the IPDM E/R terminals.

IPDM E/R terminals		Continuity
Terminal No.	Terminal No.	Continuity
87	39	Existed
88	40	Existed

Is the inspection result normal?

YES >>

GO TO 4.

NO >>

Replace the IPDM E/R.

CHECK HARNESS FOR OPEN CIRCUIT

Check the resistance between the IPDM E/R harness connector terminals.

IPDM E/R harness connector			Resistance (Ω)
Connector No.	Terminal No.
E43	39	40	Approx. 54 – 66

Is the measurement value within the specification?

YES >>

GO TO 5.

NO >>

Repair the TCM branch line.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the TCM. Refer to Diagnosis Procedure.

Is the inspection result normal?
YES (Present error) >>
Replace the TCM. Refer to Removal and Installation.
YES (Past error) >>
Error was detected in the TCM branch line.
NO >>
Repair the power supply and the ground circuit.

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