Nissan Sentra B18 (2020-2025) Service Manual: Diagnosis Procedure

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Starting System :: Dtc/circuit Diagnosis / B Terminal Circuit / Diagnosis Procedure

Diagnosis Procedure

CAUTION:

Perform diagnosis under the condition that the engine cannot start by the following procedure:

Remove fuel pump fuse.

Crank or start the engine (where possible) until the fuel pressure is released.

CHECK “B” TERMINAL CIRCUIT

Ignition switch OFF.
Check that starter motor B” terminal connection is clean and tight.

Check voltage between starter motor connector and ground.

(+)	(-)	Voltage (Approx.)
F27	B	Ground	Battery voltage

(+)

(-)

Voltage

(Approx.)

Starter motor

Connector

Terminal

F27

Ground

Battery voltage

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Check harness between battery and starter motor for open circuit.

CHECK BATTERY CABLE CONNECTION STATUS (VOLTAGE DROP TEST)

Shift selector lever to P (Park) or N (Neutral) position (CVT Models) or the clutch pedal is depressed (M/T Models).
Check voltage between battery positive terminal and starter motor B terminal.

(+)	(-)	Condition	Voltage (Approx.)
Battery positive terminal	F27	B	When the ignition switch is in START position	Less than 0.5 V

(+)

(-)

Condition

Voltage

(Approx.)

Starter motor

Connector

Terminal

Battery positive terminal

F27

When the ignition switch is in START position

Less than 0.5 V

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Check harness between the battery and starter motor for continuity.

CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)

Shift selector lever to P (Pack) or N (Neutral) position (CVT Models) or the clutch pedal is depressed (M/T Models).

Check voltage between starter motor case and battery negative terminal.

(+)	(-)	Condition	Voltage (Approx.)
Starter motor case	Battery negative terminal	When the ignition switch is in START position	Less than 0.2 V

(+)

(-)

Condition

Voltage

(Approx.)

Starter motor case

Battery negative terminal

When the ignition switch is in START position

Less than 0.2 V

Is the inspection result normal?

YES>>

“B” terminal circuit is OK. Further inspection is necessary. Refer to Work Flow (With 165-DSS–5000P) or Work Flow (Without 165-DSS–5000P).

NO>>

Check the starter motor case to engine mounting for high resistance.

S Terminal Circuit

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