ESP NISSAN GT-R 1998 User Guide

FULLY AUTOMATIC AIR CONDITIONER
System Description
The fully automatic air conditioner system utilizes sensors to detect the in-vehicle temperature, ambient
temperature, temperature of air passing through the evaporator, and
sunload. The detected values are
compared with the temperature adjustment dial setting, and calculated by the microcomputer within the
automatic amplifier. The air inlet and outlet temperatures and airflow rate are adjusted in order to main-
@ tain the in-vehicle temperature.
When an abnormal pressure occurs within the cooler cycle [gauge pressure: approx.
2.7 MPa (28 kg/
cm2G)
or higher; or approx. 0.18
MPa
(1.8
kg/cm2-G)
or lower] the refrigerant pressure sensor operates,
Ec
and stops the compressor.
The
ECM turns off the air conditioner relay, and stops the compressor during engine high load.
The blower fan motor utilizes
a brushless motor, and controls the airflow with a built-in IC that recognizes AT
the driver signal (pulse) from the automatic amplifier.
Step-motor type actuators are employed for intake door, mode door, and air mix door. They are rotated in
response to the signal (pulse) step quantity transmitted from the automatic amplifier to control the target
BR
door position.

FULLY AUTOMATIC AIR CONDITIONER
Trouble Diagnosis
by Self-diagnosis Function
(Cont'd)
Step 3 AUTO SW: ON +
I
Step 1
(CW) Tum the temperature (CCW) Turn the temperature
adjustment dial. adjustment dial. I
IGN SW: OFF
AUTO SW: ON *
T
I Step 4 I AUTO SW: ON *
4 (CW) Turn the temperature (CCW) Turn the temperature
adjustment dial. adjustment dial. I
Step 2 IGN SW: OFF
AUTO SW: ON *
I
CW: Clockwise I CCW: Counterclockwise
Step 5 Detected temperature d~splay for each sensor IGN SW: OFF AUTO SW: ON
C : Each switch indicator lamp HAK0725D
SELF-DIAGNOSIS DISPLAY ITEM
Step 1 - Display segments and indicator lamp check
Check the controller switch indicator lamp and display segments.
Normal: The switch indicator lamp and display segments are illu-
minated.
Abnormal: Malfunctioning area will not be illuminated.
lllum~nated when a short- (T"e last digir ") circuit is detected.
the display code
the corresponding codes
Step 2 - Each sensor check
Display shows "2 in the step 2 mode, and then shows the judge-
ment result.
Check the data of each sensor inputted into the automatic ampli-
fier.
Normal: Display shows
"20.
Abnormal: The last digit of the display code flashes for a malfunc-
tioning sensor. At this time, if a short-circuit
is detected,
"AUTO is displayed. Furthermore, when there are more
than one malfunctioning sensor, the corresponding dis-
play codes flash twice starting with the smaller code.
The sunload sensor will judge an abnormality when there is
insufficient lighting (less than 5,000 lx) such as while being
placed indoor or during the evening.

FULLY AUTOMATIC AIR CONDITIONER
Trouble Diagnosis by Self-diagnosis Function
(Cont'd)
Display code for malfunctioning sensor and identifying condition for automatic amplifier
I
The last digit of
Abnormal flashes for is detected.
Display code
21
22
24
25
a malfunctioning ( actuator terminal. I
When more than one
actuator terminal
are malfunctron~ng.
Ihe corresponding codes
flash twice starting
with the smaller code.
Sensor
Ambient sensor in-vehicle sensor
intake air temperature sensor
Sunload
sensor
Flashes twice
HAK0727C
Actuator display code
Identifying condition for automatic amplifier
Step 3 - Each actuator check and reset
Open circuit
Less than
41 .9"C
Less than -4 1 .g°C
Less than -4 1 .9"C
Less than 4 1.8 W/m2 (36.0 kcallm2. h)
Display shows "3" for approx. 1 second in the step 3 mode, and BB
then shows the judgement result.
Transmit an output signal to the intake door actuator, mode door
actuator, and air
mix door actuator; and check each actuator.
Furthermore, the actuator can be reset by pressing the front DEF
switch at this
time.
Normal: Display shows "30". I28
Abnormal: The display code flashes for a malfunctioning actuator.
At this time, if a short-circuit is detected, "AUTO is dis-
played. Furthermore, when there are more than one
malfunctioning sensor, the corresponding display codes
flash twice starting with the smaller code.
During reset: Display flashes
"30" and front DEF switch. (Approx.
P
EL
10 seconds)
Short-circuit
More than 100°C GI
More than 100°C
More than 100°C EG
More than 1729 W/m2 (1 487 kcal/m2.h)
Faulty harness display
SD
Display code
Actuator
Actuator
Terminal No. (actuator side)
Terminal
No. (automatic
amplifier side)
Open or short-circuit failure
display
31.0 - 32.5
Air mix door
': "AUTO" is displayed for a short-circuit.
33.0 - 34.5
Mode door
Air mix door actuator
35.0 - 36.5
Intake door
1
15
31.0
Mode door actuator
2
16
31.5
1
22
33.0
Intake door actuator
1
24
35.0
5
17
32.0 2
30
33.5
6
18
32.5 2
32
35.5
5
29
34.0
6
23
34.5
5
31
36.0 6
36
36.5

FULLY AUTOMATIC AIR CONDITIONER
Trouble Diagnosis
by Self-diagnosis Function -
When '32.5" 1s d~splayed d~rlng self-diagnos~s step 3 I I I (Cont'd)
Au;omafc amplifier
Actuator driver
powe: supply
Air mix driver
1
Air mix driver 2
Air mix driver 3
Air mix driver 4
1 1 Air mix door actuator 1
circuit
I I'
When a open-circuit failure is displayed for all four terminals of
each actuator, there is a possibility of a disconnected
connector, or broken harness of the actuator driver power
SOU rce.
The self-diagnosis cannot detect short-circuit between actua-
tor driver signals, but the actuators will vibrate when actuated.
Step 4 - Each output device check
Display shows "41" in the step 4 mode. When the DEF switch is
pushed it switches from
42-343+44+45-+46-,41. As indicated in
the following table, the automatic amplifier forcefully outputs to
each actuator, blower fan motor, and compressor in response
to
the display code. Confirm and check each output operation status
by observing, listening to the operating sound, placing hand at the
air outlet, or using other methods.
The operation status of each actuator, blower fan motor, and
1
compressor cannot be confirmed on the display.
Display code for output device and status
Display code
Output device / 11 1 42 1 43 I I I
Mode door
Intake door
Air mix door
Blower fan motor
Compressor
Air purifier (only when connected) VENT I B/L FOOT
Ambient
Recirculation
Full cold
BIL
Open 50%
61 0/e 35%
ON
ON
The blower fan motor revolution is controlled by the duty ratio
signal outputted from the automatic amplifier. (For duty ratio,
refer to "Blower Fan Motor System Check" on page
HA-15.)
Step 5 - Detected temperature display for each sensor
Display shows "5" in the step 5 mode. Every time the DEF switch
is pushed, the detected sensor temperature is displayed in
0.5"C
increments.
D/F
Ambient
Recirculation
Full cold
OFF
OFF
f' 7 Sensor display switches every tlme 2 )- z -2 - - ' the front DEF rwttch is pressed. C
X In al - - t 0 - D
A1 E ? < -
DEF
Ambient 20% ambient
Open
50% Full hot
61Yo 75%
ON
ON
Full hot
1 00% 61 %
ON
ON OFF
OFF ON
ON