Nissan Sentra B18 (2020-2025) Service Manual: Diagnosis System (a/c Amp.)
Diagnosis Description
CONSULT performs the following functions via CAN communication with A/C amp.:
|
Diagnostic mode |
CGW Status |
Description |
||
|---|---|---|---|---|
|
Restricted Mode |
Diag Test Mode |
Open Mode |
||
|
Self Diagnostic Result |
Display |
Display |
Display |
Display non-network DTC which A/C amp. memorizes. |
|
CGW Information |
Display |
Display |
Display |
|
|
Data Monitor |
Display |
Display |
Display |
Displays the input/output signal of A/C amp. |
|
Active Test |
Non display |
Display |
Display |
The signals used to activate each device are forcibly supplied from A/C amp. |
|
Work support |
Non display |
Non display |
Display |
Changes the setting for each setting function. |
|
ECU Identification |
Display |
Display |
Display |
Displays the part number of A/C amp. |
|
Network-DTC* |
Display |
Display |
Display |
Display network DTC which A/C amp. memorizes when performing “Diagnosis (All System)”. |
*: Displays when performing “Diagnosis (All System)”.
Note:
Diagnosis should be performed with engine running. Door motor operation speeds become slower and NO results may be returned even for normal operation if battery voltage drops below 12 V during self-diagnosis.
SELF DIAGNOSTIC RESULT
Diagnosis result that is judged by A/C amp. can be checked. Refer to DTC Index.
CGW INFORMATION
Display the diagnosis mode which a user can perform in Diag Test mode/Open Mode by switching the CGW status from Restricted mode to Diag Test Mode/Open Mode. For the method of switching CAN Gateway status. Refer to CONSULT Function.
DATA MONITOR
Input/output signal of A/C amp. can be checked.
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.
|
Monitor item [Unit] |
Description |
|
|---|---|---|
|
AMB TEMP SEN |
[°C] |
Ambient temperature signal value received from combination meter via CAN communication. |
|
INT TEMP SEN |
[°C] |
Evaporator fin temperature value converted from intake sensor signal received from intake sensor. |
|
AMB SEN CAL |
[°C] |
Ambient temperature value calculated by A/C amp. |
|
INT TEMP CAL |
[°C] |
Evaporator fin temperature value calculated by A/C amp. |
|
XM |
Target discharge air temperature (Driver side) judged by A/C amp. depending on the temperature setting and the value from each sensor. |
|
|
FAN REQ SIG |
[On/Off] |
Displays blower fan ON signal ON/OFF status transmitted to ECM. |
|
FAN DUTY |
[%] |
Duty ratio of blower motor judged by A/C amp. |
|
COMP REQ SIG |
[On/Off] |
Displays A/C ON signal ON/OFF status transmitted to ECM. |
|
A/C comp clutch status |
[On/Off] |
A/C compressor status judged from the A/C compressor feedback signal received from IPDM E/R via CAN communication. |
|
Cooling fan request |
[%] |
Displays cooling fan speed request signal transmitted to ECM via CAN communication. |
|
Rear window defogger request |
[On/Off] |
Display the rear window defogger request signal ON/OFF status transmitted to BCM via CAN communication. |
|
Eco mode request |
[Not REQ/ Request] |
Display the drive mode signal received from BCM via CAN communication. |
|
Illumination control duty |
[%] |
Display the illumination control output duty signal received from combination meter via CAN communication. |
|
Refrigerant PRESS SEN value |
[Bar] |
Display the refrigerant pressure sensor signal received from ECM via CAN communication. |
|
Heated steering wheel request |
Note:
This item displayed, but cannot be monitored. |
|
|
Nissan Sentra Vehicle speed |
[km/h] |
Nissan Sentra Vehicle speed signal value received from ABS actuator and electric unit (control unit) via CAN communication. |
|
ODO/TRIP METER |
[km] |
Odometer signal value received from ABS actuator and electric unit (control unit) via CAN communication. |
|
Engine RPM |
[rpm] |
Engine speed signal value received from ECM via CAN communication. |
|
ENG COOL TEMP |
[°C] |
Engine coolant temperature signal value received from ECM via CAN communication. |
ACTIVE TEST
The signals used to activate each device forcibly supplied from A/C amp. operation check of air conditioning system can be performed.
|
Test item |
Description |
|---|---|
|
HVAC TEST |
The operation check of air conditioning system can be performed by selecting the mode. Refer to the following table for the conditions of each mode. |
Check each output device
|
Test item |
|||||||
|---|---|---|---|---|---|---|---|
|
MODE 1 |
MODE 2 |
MODE 3 |
MODE 4 |
MODE 5 |
MODE 6 |
MODE 7 |
|
|
Mode door motor position |
VENT |
VENT |
B/L |
B/L |
FOOT |
D/F |
DEF |
|
Intake door motor position |
REC |
REC |
20% FRE |
20% FRE |
FRE |
FRE |
FRE |
|
Air mix door motor position |
FULL COLD |
FULL HOT |
FULL COLD |
FULL HOT |
FULL HOT |
FULL HOT |
FULL HOT |
|
Blower motor control signal (duty ratio) |
35% |
35% |
61% |
61% |
89% |
89% |
35% |
|
Magnet clutch (A/C compressor request signal) |
ON |
ON |
ON |
ON |
OFF |
OFF |
ON |
|
ECV duty ratio |
80% |
80% |
40% |
40% |
0% |
0% |
90% |
Perform the inspection of each output device after starting the engine because the A/C compressor is operated.
WORK SUPPORT
Setting change of each setting functions can be performed.
|
Work support items |
Description |
Display |
Setting |
|---|---|---|---|
|
BLOW SET |
In FOOT mode, the air blowing to DEF can change ON/OFF. |
O/A C/M* |
|
|
O/A O/M |
|
||
|
C/A O/M |
|
||
|
C/A C/M |
|
||
|
TARGET EVAPORATOR TEMP UPPER LIMIT SETTING |
Setting of upper limit value of target evaporator temperature can be changed. Control characteristic of A/C compressor control (freezing protection control and refrigerant discharge amount control) changes according to change of the setting, and then operation ratio of A/C compressor and refrigerant discharge amount are changed. According to change of the setting, control characteristic focusing on the fuel consumption can be adjusted to control characteristic focusing on the cooling capacity. |
DEFAULT* |
Target evaporator temperature upper limit value: 50°F (10°C) |
|
3°C |
Target evaporator temperature upper limit value: 37°F (3°C) |
||
|
5°C |
Target evaporator temperature upper limit value: 41°F (5°C) |
||
|
7°C |
Target evaporator temperature upper limit value: 45°F (7°C) |
*: Initial status
Note:
When the battery cable is disconnected from the negative terminal or when the battery voltage is 10 V or less, the setting for the work support item is set to the value stored 1 minute after most recent ignition switch OFF status.
ECU IDENTIFICATION
Part number of A/C amp. can be checked.
Operation
Switch Name and Function
Switch Name
and Function
OPERATION AND DISPLAY OF MANUAL AIR CONDITIONING
SYSTEM
Operation: A/C Switch Assembly
(With heated seats shown, without heated ...
Diagnosis System (ipdm E/r)
Consult Function (ipdm E/r)
CONSULT Function (IPDM E/R)
IPDM E/R
Refer to CONSULT Function (IPDM E/R).
...
Other materials:
Insufficient Cooling
Diagnosis Procedure
Diagnosis Procedure
Symptom
Insufficient cooling
No cool air comes out. (Air flow volume is
normal.)
Note:
Perform self-diagnoses with CONSULT before
performing symptom diagnosis. If any DTC is detected, perform the
...
Fuel filler cap warning system
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
The fuel filler cap warning system alerts the driver to the prevention of the
fuel filler being left uncapped and
malfunction occurrences after refueling, by turning ON the fuel filler cap
warning display on the combination
meter.
ECM judges a refuele ...
Inspection
Inspection
If a compressor is malfunctioning (internal
noise, insufficient cooling), check the compressor oil.
COMPRESSOR OIL JUDGMENT
Remove the compressor. Refer to Removal and Installation.
...
