Nissan GT-R (R35) · Service Manual VENTILATION, HEATER & AIR CONDITIONER

DIAGNOSIS SYSTEM (HVAC)

AUTOMATIC AIR CONDITIONER


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

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.
  • Temperature setting trimmer
  • Inlet port memory function (FRE)
  • Inlet port memory function (REC)
  • Foot position setting trimmer
ECU identification
Displays the part number of A/C auto amp.

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-DIAGNOSIS RESULTS

Refer to DTC Index.

Display Item List
DTC
Items
(CONSULT‐III screen terms)
Diagnostic item is detected when...
Possible cause
U1000
CAN COMM CIRCUIT
When A/C auto amp. is not transmitting or receiving CAN communication signal for 2 or more seconds.
CAN communication system
U1010
CONTROL UNIT (CAN)
When detecting error during the initial diagnosis of CAN controller of A/C auto amp.
A/C auto amp.
B257B
AMB TEMP SEN (SHORT)
The ambient sensor recognition temperature is too high.
  • Ambient sensor
  • A/C auto amp.
  • Harness and connector (Short in the ambient sensor circuit)
B257C
AMB TEMP SEN (OPEN)
The ambient sensor recognition temperature is too low.
  • Ambient sensor
  • A/C auto amp.
  • Harness and connector (Open in the ambient sensor circuit)
B2578
IN CAR SENSOR (OUT OF RANGE [LOW])
The in-vehicle sensor recognition temperature is too high.
  • In‐vehicle sensor
  • A/C auto amp.
  • Harness and connector (Short in the in-vehicle sensor circuit)
B2579
IN CAR SENSOR (OUT OF RANGE [HI])
The in-vehicle sensor recognition temperature is too low.
  • In‐vehicle sensor
  • A/C auto amp.
  • Harness and connector (Open in the in-vehicle sensor circuit)
B2581
EVAP TEMP SEN (SHORT)
The intake sensor recognition temperature is too high.
  • Intake sensor
  • A/C auto amp.
  • Harness and connector (Short in the intake sensor circuit)
B2582
EVAP TEMP SEN (OPEN)
The intake sensor recognition temperature is too low.
  • Intake sensor
  • A/C auto amp.
  • Harness and connector (Open in the intake sensor circuit)
B2630*
SUNLOAD SEN (SHORT)
Detected calorie at sunload sensor 2832 w/m2 (2437 kcal/m2·h) or more
  • Sunload sensor
  • A/C auto amp.
  • Harness and connector (Short in the sunload sensor circuit)
B2631*
SUNLOAD SEN (OPEN)
Detected calorie at sunload sensor 64.7 w/m2 (56 kcal/m2·h) or less
  • Sunload sensor
  • A/C auto amp.
  • Harness and connector (Open in the sunload sensor circuit)
B2632
DR AIRMIX ACTR (SHORT)
Air mix door PBR (driver side) position 95% or more
  • Air mix door motor (driver side)
  • A/C auto amp.
  • Harness and connector
    (CAN communication line is open or shorted)
    (Short in the air mix door motor circuit)
B2633
DR AIRMIX ACTR (OPEN)
Air mix door PBR (driver side) position 5% or less
  • Air mix door motor (driver side)
  • A/C auto amp.
  • Harness and connector
    (CAN communication line is open or shorted)
    (Open in the air mix door motor circuit)
B2634
PASS AIRMIX ACTR (SHORT)
Air mix door PBR (passenger side) position 95% or more
  • Air mix door motor (passenger side)
  • A/C auto amp.
  • Harness and connector
    (CAN communication line is open or shorted)
    (Short in the air mix door motor circuit)
B2635
PASS AIRMIX ACTR (OPEN)
Air mix door PBR (passenger side) position 5% or less
  • Air mix door motor (passenger side)
  • A/C auto amp.
  • Harness and connector
    (CAN communication line is open or shorted)
    (Open in the air mix door motor circuit)
B2636
DR VENT DOOR FAIL
When the malfunctioning door position is detected at VENT position
  • Mode door motor
  • A/C auto amp.
  • Harness and connector
    (CAN communication line is open or shorted)
    (Mode door motor is open or shorted)
B2637
DR B/L DOOR FAIL
When the malfunctioning door position is detected at B/L position
B2638
DR D/F1 DOOR FAIL
When the malfunctioning door position is detected at FOOT position
B2639
DR DEF DOOR FAIL
When the malfunctioning door position is detected at DEF position
B2654
D/F2 DOOR FAIL
When the malfunctioning door position is detected at D/F position
B2655
B/L2 DOOR FAIL
When the malfunctioning door position is detected at B/L2 position
B263D
FRE DOOR FAIL
When the malfunctioning intake door position is detected at FRE position
  • Intake door motor
  • A/C auto amp.
  • Harness and connector
    (CAN communication line is open or shorted)
    (Intake door motor is open or shorted)
B263E
20P FRE DOOR FAIL
When the malfunctioning intake door position is detected at 20%FRE position
B263F
REC DOOR FAIL
When the malfunctioning intake door position is detected at REC position
B2656
BTC FRE DOOR FAIL
When the malfunctioning intake door position is detected
*: Perform self‐diagnosis under sunshine. When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise self‐diagnosis indicates even though the sunload sensor is functioning normally.

 
 DATA MONITOR

Display item list
Monitor item [Unit]
Description
COMP REQ SIG
[On/Off]
Displays A/C switch ON/OFF status transmitted to other units via CAN communication
FAN REQ SIG
[On/Off]
Displays fan switch ON/OFF status transmitted to other units via CAN communication
AMB TEMP SEN
[°C]
Ambient sensor value converted from ambient sensor signal received from ambient sensor
IN‐VEH TEMP
[°C]
In-vehicle sensor value converted from in-vehicle sensor signal received from in-vehicle sensor
INT TEMP SEN
[°C]
Intake sensor value converted from intake sensor signal received from intake sensor
SUNLOAD SEN
[w/m2]
Sunload sensor value converted from sunload sensor signal received from sunload sensor
AMB SEN CAL
[°C]
Ambient sensor value calculated by A/C auto amp.
IN‐VEH CAL
[°C]
In-vehicle sensor value calculated by A/C auto amp.
INT TEMP CAL
[°C]
Intake sensor value calculated by A/C auto amp.
SUNL SEN CAL
[w/m2]
Sunload sensor value calculated by A/C auto amp.
FAN DUTY
[%]
Duty ratio of blower motor judged by A/C auto amp.
XM

Target discharge air temperature judged by A/C auto amp. according to the temperature setting and the value from each sensor
ENG COOL TEMP
[°C]
Water temperature signal value received from ECM via CAN communication
VEHICLE SPEED
[Mph (km/h)]
Vehicle speed signal value received from meter via CAN communication

 
 ACTIVE TEST

Test item
Description
Check each output device
The operation check of air conditioner 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 position
VENT
B/L 1
B/L 2
FOOT
D/F
DEF
—
Intake door position
REC
REC
20% FRE
FRE
FRE
FRE
—
Air mix door position
(driver & passenger side)
FULL COLD
FULL COLD
FULL HOT
FULL HOT
FULL HOT
FULL HOT
—
Blower motor control signal duty ratio
37%
91%
65%
65%
65%
91%
—
Compressor (magnetic clutch)
ON
ON
OFF
OFF
ON
ON
—
Electronic control valve (ECV) duty ratio
100%
100%
0%
0%
50%
100%
—

NOTE：
  • Perform the inspection of each output device after starting the engine because the compressor is operated.
  • If the Mode 7 is selected, the malfunction is displayed but it is normal.

 
 WORK SUPPORT

Work item
Description
Refer to
TEMP SET CORRECT
(Temperature setting trimmer)
If the temperature felt by the customer is different than the air flow temperature controlled by the temperature setting, the A/C auto amp. control temperature can be adjusted to compensate for the temperature setting.
Temperature Setting Trimmer
FRE MEMORY SET
[Inlet port memory function (FRE)]
  • If the ignition switch is turned to the OFF position while the FRE switch is set to ON (fresh air intake), “Perform the memory” or “Do not perform the memory” of FRE switch ON (fresh air intake) condition can be selected.
  • If “Perform the memory” was set, the FRE switch will be ON (fresh air intake) when turning the ignition switch to the ON position again.
  • If “Do not perform the memory” was set, the air inlets will be controlled automatically when turning the ignition switch to the ON position again.
Inlet Port Memory Function (FRE)
REC MEMORY SET
[Inlet port memory function (REC)]
  • If the ignition switch is turned to the OFF position while the REC switch is set to ON (recirculation), “Perform the memory” or “Do not perform the memory” of REC switch ON (recirculation) condition can be selected.
  • If “Perform the memory” was set, the REC switch will be ON (recirculation) when turning the ignition switch to the ON position again.
  • If “Do not perform the memory” was set, the air inlets will be controlled automatically when turning the ignition switch to the ON position again.
Inlet Port Memory Function (REC)
BLOWER SET
(Foot position setting trimmer)
In FOOT mode, the air blowing to DEF can change ON/OFF.
Foot Position Setting Trimmer

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.