2008 NISSAN TEANA engine

HAC-34
< FUNCTION DIAGNOSIS >[WITHOUT 7 INCH DISPLAY]
BLOWER MOTOR CONTROL SYSTEM
BLOWER MOTOR CONTROL SYSTEM
System DiagramINFOID:0000000003846315
System DescriptionINFOID:0000000003846316
Blower speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle tempera-
ture, intake temperature, amount of sunload and air mix door position.
By pressing the AUTO switch, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
SYSTEM OPERATION
System Operation
 For air flow, the manual selection (1-7) with the fan control dial has priority.
 If the AUTO switch is pressed or if the DEF switch is pressed while in the OFF condition, it changes to the
automatic control by A/C auto amp.
 When increasing the air flow, it changes the duty ratio of the blower motor drive signal to prevent the air flow
from suddenly increasing.
 There are the following types of air flow control: starting air flow control, starting air flow control at low cool-
ant temperature, starting air flow control at high in-vehicle temperature, and air flow control at actuator oper-
ation in addition to manual control, normal automatic air flow control.
Normal Automatic Air Flow Control
 When the target temperature is set by the temperature control switch of A/C control, the A/C auto amp. per-
forms the calculation and decides the target according to the signal from each sensor.
 The A/C auto amp. changes the duty ratio of blower motor drive signal and controls the air flow continuously
so that the air flow becomes the target air flow.
 The minimum air flow will change according to the sunload when the air discharge outlet is VENT or B/L.
Fan Speed Control Specification
JPIIA0502GB
JPIIA0635GB

BLOWER MOTOR CONTROL SYSTEM
HAC-35
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HAC
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 When starting the automatic control of air flow, the system gradually increases the duty ratio of the blower
motor drive signal to prevent too much air from blowing.
 The time period from when the air flow changes from LO to HI is approximately 8 seconds.
 It becomes the starting air flow control at low coolant temperature according to the calculation result of the A/
C auto amp. and engine coolant temperature [approximately 56°C (133°F) or less] during the automatic air
flow control.
 Do not perform the starting air flow control when the air discharge outlet is set to DEF.
Starting Fan Speed Control
Start up from COLD SOAK Condition (Automatic mode)
In cold start up condition where the engine coolant temperature is below 56°C (133°F), the blower does not
operate for a short period of time (up to 150 seconds). The exact start delay time varies depending on the
ambient temperature and engine coolant temperature.
In the most extreme case (very low ambient temperature) the blower start delay is 150 seconds as described
above. After this delay, the blower will operate at low speed until the engine coolant temperature rises above
56°C (133°F), and then the blower speed increases to the objective speed.
Start up from usual or HOT SOAK Condition (Automatic mode)
The blower will begin operation momentarily after the AUTO switch is pressed. The blower speed rises gradu-
ally to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).

HAC-40
< FUNCTION DIAGNOSIS >[WITHOUT 7 INCH DISPLAY]
DIAGNOSIS SYSTEM (HVAC)
ACTIVE TEST
HVAC TEST
NOTE:
 Perform the inspection of each output device after starting the engine because the compressor is operated.
 When choosing to “MODE 7”, error message is displayed but it is not malfunction.
WORK SUPPORT
INT TEMP CAL [°C] Intake sensor value calculated by A/C auto amp.
SUNL SEN CAL
[w/m
2]Sunload sensor value calculated by A/C auto amp.
FAN DUTY [%] Duty ratio of blower motor judged by A/C auto amp.
XMTarget discharge air temperature judged by A/C auto amp. according to the tempera-
ture 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 Monitor item [Unit] Description
Test item Description
ALL SEG Indicator all segment lighting
HVAC TESTThe operation check of A/C system can be performed by selecting the mode. Refer to the fol-
lowing table for the conditions of each mode.
Te s t i t e m
MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7
Mode door position VENT B/L1 B/L2 AUTO 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 duty ratio 37% 91% 65% 65% 65% 91% -
Compressor (Magnet
clutch)ON ON OFF OFF ON ON -
Work item Description Reference
TEMP SET CORRECTIf the temperature felt by the customer is different than the air flow
temperature controlled by the temperature setting, the auto ampli-
fier control temperature can be adjusted to compensate for the
temperature setting. HAC-10, "
Temperature
Setting Trimmer"
BLOW SETIn the FOOT mode, the air blowing to the DEF can change ON/
OFF. HAC-10, "Foot Position
Setting Trimmer"

HAC-44
< COMPONENT DIAGNOSIS >[WITHOUT 7 INCH DISPLAY]
B257B, B257C AMBIENT SENSOR
B257B, B257C AMBIENT SENSOR
DescriptionINFOID:0000000003846328
COMPONENT DESCRIPTION
Ambient Sensor
 The ambient sensor (1) is installed behind left side of front bumper.
 It detects ambient temperature and converts it into a resistance
value which is then input into the A/C auto amp.
Ambient Sensor Circuit
AMBIENT TEMPERATURE INPUT PROCESS
The A/C auto amp. equips a processing circuit for the ambient sensor input. However, when the temperature
detected by the ambient sensor increases quickly, the processing circuit retards the A/C auto amp. function. It
only allows the A/C auto amp. to recognize an ambient temperature increase of 0.33°C (0.6°F) per 100 sec-
onds.
As an example, consider stopping for a few minutes after high speed driving. Although the actual ambient tem-
perature has not changed, the temperature detected by the ambient sensor increases. This is because the
heat from the engine compartment can radiate to the front bumper area, the location of the ambient sensor.
DTC LogicINFOID:0000000003846329
DTC DETECTION LOGIC
NOTE:
 If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to HAC-
42, "DTC Logic" or HAC-43, "DTC Logic".
 If there is an open circuit in the ambient sensor, A/C auto amp. registers extreme cold [−44°C (−47°F)] and
adjusts the temperature control warmer.
DTC CONFIRMATION PROCEDURE
1.CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III
JPIIA0898ZZ
JPIIA0612GB
DTCItems
(CONSULT-III screen terms)Diagnostic item is detected when... Possible cause
B257B AMB TEMP SEN (SHORT)Detected temperature at ambient sensor
−44°C (−47°F) or less Ambient sensor
 A/C auto amp.
 Harness and connector
(Ambient sensor circuit is open,
or there is a short in the circuit) B257C AMB TEMP SEN (OPEN)Detected temperature at ambient sensor
100°C (212°F) or more

HAC-68
< COMPONENT DIAGNOSIS >[WITHOUT 7 INCH DISPLAY]
BLOWER MOTOR
BLOWER MOTOR
DescriptionINFOID:0000000003846359
COMPONENT DESCRIPTION
Brush-less Motor
The blower motor utilizes a brush-less motor with a rotating magnet.
Quietness is improved over previous motors where the brush was
the point of contact and the coil rotated.
Blower Motor Circuit
Component Function CheckINFOID:0000000003846360
1.CHECK OPERATION
1. Warm up the engine.
2. Operate the fan control dial. Check that the fan speed and indicator are switched for all fan speeds.
Does it operate normally?
YES >> INSPECTION END
NO >> Perform trouble diagnosis for the blower motor. Refer to HAC-68, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003846361
1.CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III
1. Using CONSULT-III, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
2. Check if any DTC is displayed in the self-diagnosis results.
NOTE:
If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to HAC-
42, "DTC Logic" or HAC-43, "DTC Logic".
Is any DTC displayed?
YES >> Perform the diagnosis that is applicable to the sensor and actuator. Refer to HAC-85, "DTC
Index".
NO >> GO TO 2.
2.CHECK WITH ACTIVE TEST OF CONSULT-III
1. Using CONSULT-III, perform “HVAC TEST” “ACTIVE TEST” of HVAC to check each output device. Refer
to HAC-38, "
CONSULT-III Function".
NOTE:
Perform the ACTIVE TEST after starting the engine because the compressor is operated.
ZHA152H
JSIIA0999ZZ

BLOWER MOTOR
HAC-69
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2. Check that the blower motor control signal changes according to each indicator signal.
NOTE:
 Perform the inspection of each output device after starting the engine because the compressor is oper-
ated.
 When choosing to “MODE 7”, error message is displayed but it is not malfunction.
Does it operate normally?
YES >> INSPECTION END
NO >> GO TO 3.
3.CHECK POWER SUPPLY FOR BLOWER MOTOR
1. Disconnect blower motor connector.
2. Turn ignition switch ON.
3. Check voltage between blower motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 7.
4.CHECK BLOWER MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between blower motor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair harness or connector.
5.CHECK BLOWER MOTOR CIRCUIT CONTINUITY
1. Disconnect A/C auto amp. connector.
2. Check continuity between blower motor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
Te s t i t e m
MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7
Mode door position VENT B/L1 B/L2 AUTO 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 duty ratio 37% 91% 65% 65% 65% 91% -
Compressor (Magnet
clutch)ON ON OFF OFF ON ON -
(+) (−)
Vo l ta g e Blower motor
—
Connector Terminal
M98 1 Ground Battery voltage
Blower motor
—Continuity
Connector Terminal
M98 3 Ground Existed
Blower motor A/C auto amp.
Continuity
Connector Terminal Connector Terminal
M98 2 M50 32 Existed

A/C AUTO AMP.
HAC-75
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ECU DIAGNOSIS
A/C AUTO AMP.
Reference ValueINFOID:0000000003846375
VALUES ON THE DIAGNOSIS TOOL
CONSULT-III MONITOR ITEM
TERMINAL LAYOUT
PHYSICAL VALUES
Monitor item Condition Value/Status
COMP REQ SIGEngine: Run at idle after
warming up A/C switch: ON
(Compressor operation sta-
tus) On
A/C switch: OFF Off
FAN REQ SIGEngine: Run at idle after
warming up Blower fan: ON On
Blower fan: OFF Off
AMB TEMP SEN Ignition switch ON — −30 - 55°C (−22 - 131°F)
IN-VEH TEMP Ignition switch ON — −30 - 55°C (−22 - 131°F)
INT TEMP SEN Ignition switch ON — −30 - 55°C (−22 - 131°F)
SUNLOAD SEN Ignition switch ON —0 - 1045 W/m
2
(0 - 900 kcal/m2·h)
AMB SEN CAL Ignition switch ON —−30 - 55°C (−22 - 131°F)
IN-VEH CAL Ignition switch ON —−30 - 55°C (−22 - 131°F)
INT TEMP CAL Ignition switch ON —−30 - 55°C (−22 - 131°F)
SUNL SEN CAL Ignition switch ON —0 - 1045 W/m
2
(0 - 900 kcal/m2·h)
FAN DUTYEngine: Run at idle after
warming up Blower fan: ON 21 - 91%
Blower fan: OFF 0%
XM Ignition switch ON —−100 - 150°
ENG COOL TEMP Ignition switch ON —Values according to coolant
temperature
VEHICLE SPEED Driving —Equivalent to speedometer
reading
JSIIA1205ZZ

INSUFFICIENT COOLING
HAC-89
< SYMPTOM DIAGNOSIS >[WITHOUT 7 INCH DISPLAY]
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1. Using CONSULT-III, perform “HVAC TEST” “ACTIVE TEST” of HVAC to check each output device. Refer
to HAC-38, "
CONSULT-III Function".
NOTE:
Perform the ACTIVE TEST after starting the engine because the compressor is operated.
2. Refer to the table and check the outlet, inlet, air flow temperature, blower motor control signal, magnet
clutch operation, and air mix ratio. Visually check each operating condition, by listening for noise, touching
air outlets with a hand, etc.
NOTE:
 Perform the inspection of each output device after starting the engine because the compressor is oper-
ated.
 When choosing to “MODE 7”, error message is displayed but it is not malfunction.
Does it operate normally?
YES >> GO TO 7.
NO-1 >> Air outlet does not change. Refer to HAC-61, "
Diagnosis Procedure".
NO-2 >> Air inlet does not change. Refer to HAC-64, "
Diagnosis Procedure".
NO-3 >> Discharge air temperature does not change (driver side). Refer to HAC-57, "
Diagnosis Proce-
dure".
NO-4 >> Discharge air temperature does not change (passenger side). Refer to HAC-59, "
Diagnosis Pro-
cedure".
NO-5 >> Blower motor does not operate normally. Refer to HAC-68, "
Diagnosis Procedure".
NO-6 >> Magnet clutch does not operate. Refer to HAC-72, "
Diagnosis Procedure".
7.CHECK DRIVE BELT
Check tension of the drive belt. Refer to EM-12, "
Checking".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Adjust or replace drive belt.
Te s t i t e m
MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7
Mode door position VENT B/L1 B/L2 AUTO 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 duty ratio 37% 91% 65% 65% 65% 91% -
Compressor (Magnet
clutch)ON ON OFF OFF ON ON -
JPIIA0877GB