Nissan Sentra B18 (2020-2025) Service Manual: Compressor Does Not Operate
Diagnosis Procedure
Symptom: A/C compressor does not operate.
Note:
-
Perform self-diagnoses with CONSULT before performing symptom diagnosis. If DTC is detected, perform the corresponding diagnosis.
-
Check that refrigerant system is properly charged. If refrigerant amount is below the proper amount, perform inspection of refrigerant leakage.
-
CHECK MAGNET CLUTCH OPERATION
-
Check magnet clutch. Refer to Component Function Check.
Does it operate normally?
YES >>GO TO 2.
NO >>Repair or replace malfunctioning parts.
-
-
CHECK REFRIGERANT PRESSURE SENSOR
-
Check refrigerant pressure sensor.
Is the inspection result normal?
YES >>GO TO 3.
NO >>Repair or replace malfunctioning parts.
-
-
CHECK A/C AUTO AMP. OUTPUT SIGNAL
-
CONSULTSelect “COMP REQ SIG” and “FAN REQ SIG” in “Data Monitor” mode of “HVAC”.
Monitor item
Condition
Status
COMP REQ SIG
A/C switch
ON
On
OFF
Off
FAN REQ SIG
Blower motor
ON
On
OFF
Off
Is the inspection result normal?
YES >>GO TO 4.
NO >>Replace A/C auto amp. Refer to Removal and Installation.
-
-
CHECK ECM INPUT SIGNAL
-
CONSULT
Select “AIR COND SIG” and “HEATER FAN SW” in “Data Monitor” mode of “ENGINE”.
Monitor item
Condition
Status
AIR COND SIG
A/C switch
ON
On
OFF
Off
HEATER FAN SW
Blower motor
ON
On
OFF
Off
Is the inspection result normal?
YES>>GO TO 5.
NO>>Check CAN communication system. Refer to Trouble Diagnosis Flow Chart.
-
-
CHECK IPDM E/R INPUT SIGNAL
-
CONSULT
-
Start engine.
-
Select “Compressor request 1” in “Data Monitor” mode of “IPDM E/R”.
Monitor item
Condition
Status
Compressor request 1
A/C switch
ON
On
OFF
Off
-
Is the inspection result normal?
YES >>Inspection End.
NO >>Check CAN communication system. Refer to Trouble Diagnosis Flow Chart.
-
Insufficient Heating
Diagnosis Procedure
Diagnosis Procedure
Symptom
Insufficient heating
No warm air comes out. (Air flow volume is
normal.)
Note:
Perform self-diag ...
Other materials:
Configuration (combination Meter)
Work Procedure
Work Procedure
Since vehicle specifications are not included in
the combination meter after replacement, it is required to write
Nissan Sentra vehicle specifications with CONSULT.
Configuration has three functions as
follows.
...
On Board Diagnostic (OBD) System of Engine and CVT
The ECM has an on board diagnostic system. It will light up the malfunction
indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:
Be sure to turn the ignition switch OFF and disconnect the
negative battery cable before any repair
or inspection ...
Intelligent Key
Consult Function (bcm - Intelligent Key)
CONSULT Function
(BCM - INTELLIGENT KEY)
DATA MONITOR
Note:
The following table includes information (items)
inapplicable to this Nissan Sentra vehicle. For information (items) applicable to
this vehicle, refer to CONSULT display items.
...
