coolant temperature AUDI A8 2003 D3 / 2.G Technical Features Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 2003, Model line: A8, Model: AUDI A8 2003 D3 / 2.GPages: 96, PDF Size: 5.51 MB
Page 30 of 96
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Hot-film air-mass meter G70
Engine speed sender G28
Hall sender G40 (bank 2) and
Hall sender 2 G163 (bank 1)
Lambda probe G39
(bank 1)
Lambda probe II G108
(bank 2)
Lambda probe after catalyst G130
(bank 1)
Lambda probe II after catalyst G131
(bank 2)
Throttle valve control
part J338 with
Throttle valve drive G186
(electric power control)
Throttle valve drive angle sender 1 G187
Throttle valve drive angle sender 2 G188
Coolant temperature sender G62
Knock sensor I G61 (bank 1) and
Knock sensor II G66 (bank 2)
Additional signals:
– Air conditioner requirement
– Cruise control switch
– Term. 50, stage 1
– Automatic gearbox selector lever positionEngine control unit J623
Steering
angle sender G85
ESP
control unit J104
Dash panel
insert CANAutomatic
gearbox
control unit J217
Airbag
control unit J234Intake manifold changeover valve
N156 and
Intake manifold changeover valve 2
N261
Left electrohydraulic engine mounting
solenoid valve N144 and
Right electrohydraulic engine mounting
solenoid valve N145
Torque rod valve N382
Lambda probe heater Z19
(bank 1) and
Lambda probe 2 heater Z28
(bank 2)
Lambda probe 1 heater
after catalyst Z29
Lambda probe 2 heater
after catalyst Z30
Additional signals:
– Starter relay term. 50, stage 2
– Tank leakage pump (USA only)
– Air conditioner compressor (out)Fuel pump relay J17
Fuel pump G6
Fuel pump II relay J49
Fuel pump G23
Injectors N30, N31, N32, N33 (bank 1)
Injectors N83, N84, N85, N86 (bank 2)
Ignition coils N (no. 1 cyl.), N128 (no. 2 cyl.),
N158 (no. 3 cyl.), N163 (no. 4 cyl.)
Ignition coils N164 (no. 5 cyl.), N189 (no. 6 cyl.),
N190 (no. 7 cyl.), N191 (no. 8 cyl.)
Activated charcoal filter system solenoid
valve 1 N80
Secondary-air pump relay J299 and
Secondary-air pump motor V101
Secondary air inlet valve N112
Throttle valve control part J338
With throttle valve drive G186
Inlet camshaft timing adjustment valve 1
N205 (bank 1)
and
N208 (bank 2) Pedal position sender/accelerator
pedal module with accelerator pedal
position sender G79 and accelerator
pedal position sender 2 G185
Brake light switch F and
Brake pedal switch F47
Clutch pedal switch F36
(manual gearbox only)
Control unit with display in dash
panel insert J285Data bus diagnostic
interface J533
Engine, Mechanics
System layout
Actuators/sensors
SSP282_091 Drive system CAN
Diagnosis CAN
Page 31 of 96
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Hot-film air-mass meter G70
Engine speed sender G28
Hall sender G40 (bank 2) and
Hall sender 2 G163 (bank 1)
Lambda probe G39
(bank 1)
Lambda probe II G108
(bank 2)
Lambda probe after catalyst G130
(bank 1)
Lambda probe II after catalyst G131
(bank 2)
Throttle valve control
part J338 with
Throttle valve drive G186
(electric power control)
Throttle valve drive angle sender 1 G187
Throttle valve drive angle sender 2 G188
Coolant temperature sender G62
Knock sensor I G61 (bank 1) and
Knock sensor II G66 (bank 2)
Additional signals:
– Air conditioner requirement
– Cruise control switch
– Term. 50, stage 1
– Automatic gearbox selector lever positionEngine control unit J623
Steering
angle sender G85
ESP
control unit J104
Dash panel
insert CANAutomatic
gearbox
control unit J217
Airbag
control unit J234Intake manifold changeover valve
N156 and
Intake manifold changeover valve 2
N261
Left electrohydraulic engine mounting
solenoid valve N144 and
Right electrohydraulic engine mounting
solenoid valve N145
Torque rod valve N382
Lambda probe heater Z19
(bank 1) and
Lambda probe 2 heater Z28
(bank 2)
Lambda probe 1 heater
after catalyst Z29
Lambda probe 2 heater
after catalyst Z30
Additional signals:
– Starter relay term. 50, stage 2
– Tank leakage pump (USA only)
– Air conditioner compressor (out)Fuel pump relay J17
Fuel pump G6
Fuel pump II relay J49
Fuel pump G23
Injectors N30, N31, N32, N33 (bank 1)
Injectors N83, N84, N85, N86 (bank 2)
Ignition coils N (no. 1 cyl.), N128 (no. 2 cyl.),
N158 (no. 3 cyl.), N163 (no. 4 cyl.)
Ignition coils N164 (no. 5 cyl.), N189 (no. 6 cyl.),
N190 (no. 7 cyl.), N191 (no. 8 cyl.)
Activated charcoal filter system solenoid
valve 1 N80
Secondary-air pump relay J299 and
Secondary-air pump motor V101
Secondary air inlet valve N112
Throttle valve control part J338
With throttle valve drive G186
Inlet camshaft timing adjustment valve 1
N205 (bank 1)
and
N208 (bank 2) Pedal position sender/accelerator
pedal module with accelerator pedal
position sender G79 and accelerator
pedal position sender 2 G185
Brake light switch F and
Brake pedal switch F47
Clutch pedal switch F36
(manual gearbox only)
Control unit with display in dash
panel insert J285Data bus diagnostic
interface J533
Engine, Mechanics
System layout
Actuators/sensors
SSP282_091 Drive system CAN
Diagnosis CAN
Page 78 of 96
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Electric rear additional heater
An electric rear additional heater is fitted
under each front seat in the rear climate
control footwell air ducts.
Heating/Air Conditioner
A further advantage is that independent
temperature regulation (heating) can be
provided for the rear footwell with the 4-zone
system.
A supply of colder air to the rear climate zones
as opposed to the front can be achieved by
way of the centre chest vents.
The temperature can however only be reduced
but not increased via these vents through the
addition of cold air.
As in the predecessor model, two separately
controlled heat exchangers permit the setting
of different temperatures at front left/right.
All occupants can therefore be provided with
individual climate control. Operation
Following a cold start or at low ambient
temperatures, there is insufficient waste heat
in the coolant to warm the rear of the vehicle
by means of a conventional fluid-filled heater.
In addition, the drop in temperature in the rear
air duct is extremely high in the initial phase.
This problem has been solved by integrating
two electric rear additional heaters into the
rear footwell air duct.
These employ electrical energy from the
vehicle electrical system to heat the air
supplied to the passenger compartment.
In this way, the heating function is available
immediately following cold starting.
As was the case with the predecessor
model, in situ heat exchanger
replacement is possible. The procedure
involved is described in the current
Workshop Manual.
SSP282_102
Page 80 of 96
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Heating/Air Conditioner
SSP282_103 Fresh-air intake duct
temperature sensor G89
Flap control
motor potentiometers
G92, G113, G135, G136,
G137, G138, G139, G140,
G143, G317, G318, G349,
G350, G351, G352
Air quality sensor G238
Left/right vent temperature
sender G150/G151
Centre vent temperature
sender G191
Evaporator outflow temperature
sender G263
High-pressure sender G65
Sunlight penetration
photosensor G107
Solar cells in sunroof C20
System layoutControl unit with display
in dash panel insert J285
MOST busFront information display and
operating unit control unit J523
Rear right footwell heater
element Z43 Rear left footwell heater
element Z42 Fresh-air blower control unit
J126 with fresh-air blower V2Diagnosis CAN
Data bus diagnostic
interface J533
Sunroof electronics
control unit J528 Humidity
sender G355
Humidity sender
heater N340
Climatronic
control unit J255
Convenience CAN
Additional heater
control unit J364 Rear Climatronic control
and display unit E265Energy management
control unit J644Drive system CANEngine control unit J623Front information and display and
operating unit control unit J685
Radiator fan
control unit J293
Radiator fan V7
Air conditioning system compressor regulating valve N280
Flap control motors
V68, V71, V102, V107, V108, V109,
V110, V111, V113, V199, V200, V220,
V218, V219, V221
Coolant circulation pump V50
Left/right heat regulation valve N175/N176
Heated windscreen control unit J505
Heated windscreen Z2
Driver seat/front passenger seat ventilation control unit
J672/J673
Front left/front right heated seat Z45/Z46
Temperature sender for front left/front right seat
G344/G345
Page 81 of 96
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Heating/Air Conditioner
SSP282_103 Fresh-air intake duct
temperature sensor G89
Flap control
motor potentiometers
G92, G113, G135, G136,
G137, G138, G139, G140,
G143, G317, G318, G349,
G350, G351, G352
Air quality sensor G238
Left/right vent temperature
sender G150/G151
Centre vent temperature
sender G191
Evaporator outflow temperature
sender G263
High-pressure sender G65
Sunlight penetration
photosensor G107
Solar cells in sunroof C20
System layoutControl unit with display
in dash panel insert J285
MOST busFront information display and
operating unit control unit J523
Rear right footwell heater
element Z43 Rear left footwell heater
element Z42 Fresh-air blower control unit
J126 with fresh-air blower V2Diagnosis CAN
Data bus diagnostic
interface J533
Sunroof electronics
control unit J528 Humidity
sender G355
Humidity sender
heater N340
Climatronic
control unit J255
Convenience CAN
Additional heater
control unit J364 Rear Climatronic control
and display unit E265Energy management
control unit J644Drive system CANEngine control unit J623Front information and display and
operating unit control unit J685
Radiator fan
control unit J293
Radiator fan V7
Air conditioning system compressor regulating valve N280
Flap control motors
V68, V71, V102, V107, V108, V109,
V110, V111, V113, V199, V200, V220,
V218, V219, V221
Coolant circulation pump V50
Left/right heat regulation valve N175/N176
Heated windscreen control unit J505
Heated windscreen Z2
Driver seat/front passenger seat ventilation control unit
J672/J673
Front left/front right heated seat Z45/Z46
Temperature sender for front left/front right seat
G344/G345
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J126 Fresh-air blower control unit
J255 Climatronic control unit
J528 Sunroof electronics control unit
J533 Data bus diagnostic interface
N175 Left heat regulation valve
N176 Right heat regulation valve
N280 Air conditioning system compressor
regulating valve
N340 Humidity sender heater
T16 16-pin connector
(diagnostic connection)
V2 Fresh-air blower
V42 Temperature sensor blower
V50 Coolant circulation pump
V68 Temperature flap control motor
V71 Air-flow flap control motor
V102 Central vent control motor
V107 Defroster flap control motor
V108 Left footwell flap control motor
V109 Right footwell flap control motor
V110 Left central vent control motor
V111 Right centre vent control motor
V113 Air-recirculation flap control motor
V199 Front right defroster/chest vent
shutoff flap control motor
V200 Front left defroster/chest vent
shutoff flap control motor
V220 Rear left vent warm/cold flap
control motor
V221 Rear right vent warm/cold flap
control motor
Z42 Rear left footwell heater element
Z43 Rear right footwell heater element
Z45 Front left heated seat
Z46 Front right heated seat
Block diagram for
front air conditioner
Key
C20 Solar cells
G56 Dash panel temperature sensor
G65 High-pressure sender
G89 Fresh-air intake duct temperature
sensor
G92 Temperature flap control motor
potentiometer
G107 Sunlight penetration photosensor
G113 Air-flow flap control motor
potentiometer
G135 Defrost flap control motor
potentiometer
G136 Left central vent control motor
potentiometer
G137 Right central vent control motor
potentiometer
G138 Central vent control motor
potentiometer
G139 Left footwell flap control motor
potentiometer
G140 Right footwell flap control motor
potentiometer
G143 Air recirculation flap control motor
potentiometer
G150 Left vent temperature sender
G151 Right vent temperature sender
G191 Centre vent temperature sender
G238 Air quality sensor
G263 Evaporator outflow temperature
sender
G317 Front right defroster/
chest vent shutoff flap
control motor potentiometer
G318 Front left defroster/
chest vent shutoff flap
control motor potentiometer
G344 Temperature sender for front left seat
G345 Temperature sender for front
right seat
G347 Centre left vent sensor
G348 Centre right vent sensor
G351 Rear left vent warm/cold
control motor potentiometer
G352 Rear right vent warm/cold
control motor potentiometer
G355 Humidity sender
Heating/Air Conditioner
Page 90 of 96
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Auxiliary heater/coolant additional heater
An auxiliary heater is available as an option
for all vehicle and engine versions. The
auxiliary heater with petrol engines and
additional heater with diesel engines are
integrated into the engine coolant circuit.
Vehicles with diesel engine are fitted with an
additional heater as standard. On diesel
engines with auxiliary heater, the activated
auxiliary heater is also used as engine
additional heater depending on temperature.
Heating/Air Conditioner
Design and operation are described in
SSP 240 – Audi A2 Technical Features.
Operation with cut-in by way of remote
control or timer
In the Audi A8 ´03, the auxiliary heater is
activated by the air conditioner. The heated
coolant is initially supplied to the passenger
compartment (primarily auxiliary heater
mode). On attaining pre-determined
temperature levels, engine pre-heating is
then switched in in line with a characteristic
curve.
Activation sequence:
1 A remote control or timer signal is
transmitted to the auxiliary heater control
unit.
2 The auxiliary heater then transmits a signal
via the CAN bus to the Climatronic control
unit J255.
3 The control unit then decides as a function
of desired temperature, ambient
temperature and passenger compartment
temperature whether auxiliary ventilation
or auxiliary heating is to be employed.
The setting of the auxiliary heater/
ventilation function is shown in the setup
menu in the MMI (Multimedia-Interface).The cut-in time is "programmed" by way of
the MMI system (Multimedia Interface) under
the menu item "timer status".
4.1 Auxiliary ventilation sequence
The energy management control unit
J644 interrogates the battery capacity
check function of the battery and energy
management system to determine
whether auxiliary ventilation can be
accepted. In the event of acceptance, the
fresh-air blower is actuated.
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4.2 Auxiliary heating sequence
The level of fuel in the tank is
interrogated. If the fuel tank is "empty",
the auxiliary heating function is not
permitted and the auxiliary heater symbol
in the dash panel insert goes out. "Empty"
roughly corresponds to the red display
zone. The energy management control
unit J644 checks whether there is
sufficient energy to accept auxiliary
heating. If this is the case, the auxiliary
heater is switched on in the various
operating modes depending on the
characteristic temperature curve and the
fresh-air blower is actuated.
If the auxiliary heating temperature
reaches a level of 30 °C, the fresh-air
blower is activated and the coolant
shutoff valve N279 pulsed in line with the
characteristic curve.
The auxiliary heater is switched off
automatically on completion of the operating
time transmitted by the MMI system to the
Climatronic control unit or it can be switched
off using the remote control OFF button.
Auxiliary heater circulation pump control
To speed up heating of the passenger
compartment and to achieve a better "heat
yield" in the air conditioner unit heat
exchanger, the circulation pump V55 and
coolant shutoff valve N279 are pulsed as a
function of water temperature and the
heating circuit flow rate is thus reduced.
An electric circulation pump is used for the
auxiliary heater. It is not possible to reduce
the supply voltage in the auxiliary heater
control unit and the circulation pump is thus
actuated at specific intervals to decrease its
output.
Additional control curve for "auxiliary heater"
and "additional heater"
When the engine is on, the auxiliary heater
and engine temperatures are constantly
compared. A switch to the large coolant
circuit is made as soon as the engine
temperature exceeds the auxiliary heater
temperature.
Activation of auxiliary heater circulation
pump with engine on
(pulsed operation of circulation pump)
In order to be able to ensure a sufficient flow
of water through the heat exchanger, the
auxiliary heater circulation pump must
additionally be switched on, as is the case for
instance with the 12-cylinder engine.If the engine is switched off again and not
all additional heater criteria (temperature,
time) are satisfied, the auxiliary heater
remains in operation for any residual
operating time before being deactivated.
This function can be encoded.
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Small coolant circuit with auxiliary heater
The small coolant circuit employed with
auxiliary heating is designed to ensure rapid
warming of the passenger compartment.
With the engine stopped, the coolant shutoff
valve N279 switches to the small heating
circuit until a defined temperature value has
been attained. The coolant exiting from the
heat exchangers via the pump/valve unit is
conveyed by the circulation pump V55 into
the auxiliary heater. After being warmed, the
coolant is pumped back into the heat
exchangers and initially heats the passenger
compartment.
Heating/Air Conditioner
SSP282_097
Design and operation are described in
SSP 267 – The 6.0 l W12 engine in the
Audi A8 - Part 1.
Coolant shutoff
valve N279
Circulation pump V55Auxiliary heater with
additional heater control unit J364
Non-return valve 2
Continued coolant
circulation pump V51 Tempera-
ture
senderPump/valve unit with
heating-system heat
exchangers Cap
Coolant
circulation
pump V50