Nissan Sentra B18 (2020-2025) Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: Automatic Air Conditioner / Dtc/circuit Diagnosis / B24a4-11 Intake Sensor

Nissan Sentra B18 (2020-2025) Service Manual: B24a4-11 Intake Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
B24A4-11	INTAKE SENSOR (Intake sensor)	Diagnosis condition	Ignition switch ON
		Signal (Terminal)	Intake sensor signal
		Threshold	The intake sensor recognition temperature is too high [more than 212°F (100°C)]
		Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

Intake sensor
A/C auto amp.
Harness or connectors (The sensor circuit is shorted to ground)

FAIL-SAFE

—

Confirmation Procedure

Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE
1. CONSULT
  1. Ignition switch ON.
  2. Select “Self Diagnostic Result” mode of “HVAC”.
  3. Check DTC.
Is 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

CHECK INTAKE SENSOR SIGNAL

Ignition switch ON.

Check voltage between A/C auto amp. harness connector.

A/C auto amp.	Voltage (Approx.)
M33	23	26

A/C auto amp.

Voltage

(Approx.)

Connector

Terminals

M33

Is the inspection result normal?

YES >>

Replace A/C auto amp. Refer to Removal and Installation.

NO >>

GO TO 2.

CHECK INTAKE SENSOR POWER SUPPLY

Ignition switch OFF.
Disconnect intake sensor connector.
Ignition switch ON.

Check voltage between intake sensor harness connector and ground.

+	-	Voltage (Approx.)
M169	1	Ground	5 V

Voltage

(Approx.)

Intake sensor

Connector

Terminal

M169

Ground

5 V

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

GO TO 4.

CHECK INTAKE SENSOR
1. Check intake sensor. Refer to Diagnosis Procedure.
Is the inspection result normal?
YES >>
Replace A/C auto amp. Refer to Removal and Installation.
NO >>
Replace intake sensor. Refer to Removal and Installation.

CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR SHORT

Ignition switch OFF.
Disconnect A/C auto amp. connector.

Check continuity between intake sensor harness connector and ground.

Intake sensor		—	Continuity
Connector	Terminal	—	Continuity
M169	1	Ground	No

Is the inspection result normal?

YES >>

Replace A/C auto amp. Refer to Removal and Installation.

NO >>

Repair harness or connector.

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