Nissan Murano: Heater & Air Conditioning Control System :: System Description / Diagnosis System (hvac)

Nissan Murano (Z52) 2015-2024 Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: System Description / Diagnosis System (hvac)

Description

Air conditioning system performs self-diagnosis, operation check, function diagnosis, and various settings using diagnosis function of each control unit.

ECU

Diagnostic item

(CONSULT)
A/C auto amp. HVAC Self Diagnostic Result
Data Monitor
Active Test
Work support
ECM ENGINE Self Diagnostic Result
Data Monitor
IPDM E/R IPDM E/R Self Diagnostic Result
Data Monitor
Auto active test
CONSULT Function

CONSULT performs the following functions via CAN communication with A/C auto amp.

APPLICATION ITEMS

Diagnostic mode Description
Self Diagnostic Result Displays the diagnosis results judged by A/C auto amp.
Data Monitor Displays the input/output signal of A/C auto amp.
Active Test The signals used to activate each device are forcibly supplied from A/C auto amp.
Work support Changes the setting for each setting function.
ECU Identification Displays the part number of A/C auto amp.
Configuration

  • The Nissan Murano vehicle specification that is written in A/C auto amp. can be displayed or stored.

  • The vehicle specification can be written when A/C auto amp. is replaced.

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

Refer to DTC Index.

ACTIVE TEST

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 (front) position VENT VENT B/L D/F1 D/F2 DEF DEF
Intake door motor position REC REC 20% FRE FRE FRE FRE FRE
Air mix door motor position FULL COLD FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Front blower motor control signal duty ratio 30% 30% 60% HI HI 60% HI
Magnet clutch ON ON ON OFF OFF ON ON
ECV Duty 100% 100% 50% 0% 0% 100% 100%

NOTE:

Perform the inspection of each output device after starting the engine because the A/C compressor is operating.

DATA MONITOR

NOTE:

The following table includes information (items) inapplicable to this Nissan Murano vehicle: For information (items) applicable to this vehicle, refer to CONSULT display items.

Display item list
Monitor item [Unit] Description
AMB TEMP SEN [°C (°F)] Ambient sensor value converted from ambient sensor signal received from ambient sensor.
IN-VEH TEMP [°C (°F)] In-Nissan Murano vehicle sensor value converted from in-vehicle sensor signal received from in-vehicle sensor.
INT TEMP SEN [°C (°F)] Intake sensor value converted from intake sensor signal received from intake sensor.
SUNLOAD SEN [w/m2] Sunload sensor (driver side) value converted from sunload sensor signal received from sunload sensor.
AMB SEN CAL [°C (°F)] Ambient temperature value calculated by A/C auto amp.
IN-VEH CAL [°C (°F)] In-Nissan Murano vehicle temperature value calculated by A/C auto amp.
INT TEMP CAL [°C (°F)] Front evaporator fin temperature value calculated by A/C auto amp.
SUNL SEN CAL [w/m2] Sunload (driver side) value calculated by A/C auto amp.
COMP REQ SIG [On/Off] Displays A/C ON signal ON/OFF status transmitted to other units via CAN communication.
FAN REQ SIG [On/Off] Displays front blower motor ON/OFF status transmitted to other units via CAN communication.
FAN DUTY Duty ratio of front blower motor judged by A/C auto amp.
XM Target discharge front air temperature (driver side) judged by A/C auto amp. depending on the temperature setting and the value from each sensor.
PA TARGET A/TEMP Target discharge front air temperature (passenger side) judged by A/C auto amp. depending on the temperature setting and the value from each sensor.
ENG COOL TEMP [°C (°F)] Engine coolant temperature signal value received from ECM via CAN communication.
Nissan Murano Vehicle SPEED [km/h (mph)] Vehicle speed signal value received from combination meter via CAN communication.
PASS SUNL CAL [w/m2] Sunload value (passenger side) calculated by A/C auto amp.
PASS SUNL SEN CAL [w/m2] Sunload value calculated from sunload sensor signal (passenger side) received from sunload sensor.

WORK SUPPORT

Work item Description Refer to
TEMP SET CORRECT Setting change of temperature setting trimmer (front) can be performed. Temperature Setting Trimmer (Front)
REC MEMORY SET Setting change of inlet port memory function (REC) can be performed. Inlet Port Memory Function (REC)
FRE MEMORY SET Setting change of inlet port memory function (FRE) can be performed. Inlet Port Memory Function (FRE)
BLOW SET Setting change of foot position setting trimmer can be performed. Foot Position Setting Trimmer
TARGET EVAPORATOR TEMP UPPER LIMIT SETTING Setting change of evaporator target temperature upper limit value can be performed. Target Evaporator Temperature Upper Limit Value

NOTE:

When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10 V or less, the setting of WORK SUPPORT may be cancelled.

ECU IDENTIFICATION

Part number of A/C auto amp. can be checked.

CONFIGURATION

The vehicle specification that is written in A/C auto amp. can be displayed or stored.

The vehicle specification can be written when A/C auto amp. is replaced.

Refer to Description.

    Operation

    Switch Name and Function Controller (A/C switch assembly) 1. AUTO switch 2. Temperature control dial (driver side) 3. Defroster switch 4. Fan switch 5...

    Heater & Air Conditioning Control System :: Ecu Diagnosis Information

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