Nissan Sentra B18 (2020-2025) Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: Manual Air Conditioner / Basic Inspection

Nissan Sentra B18 (2020-2025) Service Manual: Basic Inspection

Diagnosis and Repair Workflow

Work Flow

Work Flow

OVERALL SEQUENCE

DETAILED FLOW

INTERVIEW CUSTOMER
1. Interview the customer to obtain as much information as possible about the conditions and environment under which the malfunction occurred.
>>
GO TO 2.
SYMPTOM CHECK
1. Verify symptoms.
>>
GO TO 3.
CHECK FOR DTCS
1. CONSULT
  1. Ignition switch ON.
  2. Select “Self Diagnostic Result” mode of “HVAC”.
  3. Check DTC.
Is any DTC detected?
YES >>
GO TO 4.
NO >>
GO TO 5.
TROULE DIAGNOSIS BY DTC
1. Perform the diagnostic procedure for the detected DTC. Refer to DTC Inspection Priority Chart.
>>
GO TO 7.
OPERATION CHECK
1. Perform the operation check. Refer to Work Procedure.
>>
GO TO 6.
SYMPTOM DIAGNOSIS
1. Check the symptom diagnosis table. Refer to Symptom Table.
>>
GO TO 8.
VERIFY REPAIR
1. CONSULT
  1. Ignition switch ON.
  2. Select “Self Diagnostic Result” mode of “HVAC”.
  3. Check DTC.
Is any DTC detected?
YES >>
GO TO 4.
NO >>
GO TO 8.
PERFORM FINAL OPERATION CHECK
1. Perform the operation check. Refer to Work Procedure.
Does it operate normally?
YES >>
Inspection End.
NO >>
GO TO 2.

Operation Inspection

Work Procedure

Work Procedure

DESCRIPTION

The purpose of the operational check is to check that the individual system operates normally.

Check condition	: Engine running at normal operating temperature.
Check condition	: Blower control dial in OFF position.
Check condition	: REC off (LED extinguished).
Check condition	: VENT selected (LED illuminated).
Check condition	: DEF off (LED extinguished).

OPERATION INSPECTION

CHECK BLOWER
1. 1. Rotate the blower control dial clockwise one detent. Blower should operate on low speed.
  2. Rotate the blower control dial one detent at a time, and continue checking blower speed until all speeds are checked.
  3. Leave blower on maximum speed.
Is the test result normal?
YES >>
GO TO 2.
NO >>
Refer to Diagnosis Procedure.
CHECK A/C SWITCH LED
1. 1. Press A/C switch.
  2. A/C switch indicator should turn ON.
Is the test result normal?
YES >>
GO TO 3.
NO >>
Refer to Diagnosis Procedure.
CHECK A/C SWITCH
1. Confirm that the A/C compressor clutch engages (sound or visual inspection).
Is the test result normal?
YES >>
GO TO 4.
NO >>
Refer to Diagnosis Procedure.
CHECK A/C SWITCH ASSEMBLY MODE LEDS
1. 1. Press D/F (), FOOT (), B/L , and VENT , MAX A/C, and DEF ().
  2. Each button indicator should illuminate.
Is the test result normal?
YES >>
GO TO 5.
NO >>
Refer to Diagnosis Procedure.
CHECK DISCHARGE AIR
1. 1. Press D/F (), FOOT (), B/L , and VENT and DEF ().
  2. Confirm that discharge air comes out according to the air distribution table. Refer to Door Control.
Is the test result normal?
YES >>
GO TO 6.
NO >>
Refer to Symptom Table.
CHECK REC LED
1. 1. Press DEF () and make sure LED is off.
  2. Make sure VENT () or B/L () is selected.
  3. Press REC () switch one time. REC indicator should illuminate.
  4. Press REC () switch one more time. REC indicator should go off.
Is the test result normal?
YES >>
GO TO 7.
NO >>
Refer to Diagnosis Procedure.
CHECK INTAKE DOOR OPERATION
1. 1. Press REC () switch one time. REC indicator should illuminate.
  2. Listen to the sound of the air coming out of the vent.
  3. Press REC () switch one more time. REC indicator should go off.
  4. There should be an audible change to the sound of the air flowing out of the vent.
Is the test result normal?
YES >>
GO TO 8.
NO >>
Refer to Diagnosis Procedure.
CHECK TEMPERATURE DECREASE
1. 1. Press A/C switch.
  2. Rotate temperature control dial counterclockwise until maximum cold.
  3. Check for cold air at selected discharge air outlets.
Is the test result normal?
YES >>
GO TO 9.
NO >>
Refer to Component Function Check.
CHECK TEMPERATURE INCREASE
1. 1. Rotate temperature control dial clockwise until maximum hot.
  2. Check for hot air at appropriate discharge air outlets.
Is the test result normal?
YES >>
Inspection End.
NO >>
Refer to Component Function Check.

System Setting

Target Evaporator Temp Upper Limit

Target Evaporator Temp Upper Limit

DESCRIPTION

Set the target evaporator temperature upper limit.

HOW TO SET

CONSULT

Select “TARGET EVAPORATOR TEMP UPPER LIMIT SETTING” in “Work support” mode of “HVAC”.

Work support items	Display
TARGET EVAPORATOR TEMP UPPER LIMIT SETTING	Initial Setting
	Low
	Middle
	High

Foot Position Setting Trimmer

Foot Position Setting Trimmer

DESCRIPTION

In FOOT mode, the air blowing to DEF can change ON/OFF.

HOW TO SET

CONSULT

Select “BLOW SET” in “Work support” mode of “HVAC”.

Work support items	Display	Defroster door position
Work support items	Display	Auto control	Manual control
BLOW SET	Mode1 (initial status)	OPEN	CLOSE
	Mode2	OPEN	OPEN
	Mode3	CLOSE	OPEN
	Mode4	CLOSE	CLOSE

Note:

When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10V or less, the setting of the discharge air mix ratio in FOOT mode may be cancelled.

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