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Audi A4 Current Flow Diagram No. 10 / 1

Edition 05.2003

1.8 litre fuel injection engine (125 kW - Motronic - 4-cylinder), engine code AMB, with diagnostic pump for
leakage in fuel system
From model year 2003

Main fuse

On battery

Fuse box
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Dash panel, driver's side

Fuse colours
30 A - green
25 A - white
20 A - yellow
15 A - blue
10 A - red
7.5 A - brown
5 A - beige

Note:

From fuse number 23 upwards the fuses in the fuse box are designated as 223 etc. in the Current Flow Diagram.

Connector point with screw connection

In electronics box, plenum chamber

1 - 10-pin connector, black (T10)
2 - 10-pin connector, brown (T10a)
3 - 17-pin connector, red (T17d)
6 - 17-pin connector, white (T17e)

Connector point, A pillar

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On left-hand side, bottom, behind side trim

13 - 10-pin connector, purple (T10c)
14 - 10-pin connector, grey (T10d)
15 - 17-pin connector, green (T17b)
16 - 17-pin connector, red (T17a)
17 - 17-pin connector, black (T17)

4-point relay carrier with screw connection

Dash panel, driver's side

4-point relay carrier

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In electronics box, plenum chamber

2 - Secondary air pump relay
3 - Motronic current supply relay
4 - Starter inhibitor relay (clutch pedal switch)
A - Fuse for Motronic
B - Secondary air pump fuse

9-point relay carrier with onboard power supply control unit

Dash panel, driver's side, behind 3-point relay carrier

1 - Fuel pump relay
4 - Brake servo relay
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Audi A4 Current Flow Diagram No. 10 / 2

Battery, starter, alternator, starter inhibitor relay, clutch pedal
switch
A - Battery
B - Starter
C - Alternator
C1 - Voltage regulator
F194 - Clutch pedal switch
J434 - Starter inhibitor relay (clutch pedal switch)
S88 - Strip fuse (main fuse)
T1d - Single connector, black, engine compartment, left
T2 - 2-pin connector, black, engine compartment, right
T17e - 17-pin connector, white, connector point, electronics box,
plenum chamber
11
- Earth point, in battery box
4

238
- Earth connection -1-, in interior wiring harness

500
- Screw connection -1- (30), on relay plate
* - Only applies to models with manual gearbox
** - See applicable Current Flow Diagram: Automatic gearbox
ws = white (multitronic 01J or AG5)
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
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Audi A4 Current Flow Diagram No. 10 / 3

Ignition/starter switch, fuel pump relay, fuses
D - Ignition/starter switch
J17 - Fuel pump relay
S5 - Fuse in fuse box/relay plate
S7 - Fuse in fuse box/relay plate
S9 - Fuse in fuse box/relay plate
S14 - Fuse in fuse box/relay plate
S228 - Fuse in fuse box
S232 - Fuse in fuse box
S234 - Fuse in fuse box
S243 - Fuse in fuse box
T10a - 10-pin connector, brown, connector point, electronics box,
1
plenum chamber
501
- Screw connection -2- (30), on relay plate

A2
- Positive (+) connection (15), in dash panel wiring harness

A32
- Positive (+) connection (30), in dash panel wiring harness

A52
- Positive (+) connection -2- (30), in dash panel wiring
ws = white harness
sw = black - Positive (+) connection -3- (30), in dash panel wiring
ro = red A57
rt = red harness
br = brown
A98
- Positive (+) connection -4- (30), in dash panel wiring
gn = green harness
bl = blue
gr = grey A99
- Connection -1- (87), in dash panel wiring harness
li = purple
vi = purple A152
- Connection -5- (87), in dash panel wiring harness
ge = yellow * - Only applies to models with manual gearbox
or = orange
rs = pink
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Audi A4 Current Flow Diagram No. 10 / 4

Motronic control unit, Motronic current supply relay
J217 - Automatic gearbox control unit
J220 - Motronic control unit
J271 - Motronic current supply relay
S4 - Fuse in fuse box/relay plate
S229 - Fuse in fuse box
S282 - Engine electronics fuse
T17d - 17-pin connector, red, connector point, electronics box,
plenum chamber
T17e - 17-pin connector, white, connector point, electronics box,
plenum chamber
12
- Earth point, in engine compartment, left

83
- Earth connection -1-, in front right wiring harness
3

D50
- Positive (+) connection (30), in engine compartment wiring
harness
D52
- Positive (+) connection (15a), in engine compartment
wiring harness
D173
- Connection (87), in engine wiring harness
ws = white * - Only applies to models with automatic gearbox
sw = black
ro = red (multitronic 01J)
rt = red ** - Only applies to models with five-speed automatic gearbox
br = brown (AG5)
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
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Audi A4 Current Flow Diagram No. 10 / 5

Motronic control unit, air mass meter, coolant temperature
sender - radiator outlet, injectors, fuel system diagnostic pump
G70 - Air mass meter
G83 - Coolant temperature sender - radiator outlet
J220 - Motronic control unit
N30 - Injector, cylinder 1
N31 - Injector, cylinder 2
N32 - Injector, cylinder 3
N33 - Injector, cylinder 4
T10a - 10-pin connector, brown, connector point, electronics box,
plenum chamber
T17d - 17-pin connector, red, connector point, electronics box,
plenum chamber
V144 - Fuel system diagnostic pump
D22
- Connection (via fuse 234), in front right wiring harness

D95
- Connection (injectors), in engine compartment wiring
harness

ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
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Audi A4 Current Flow Diagram No. 10 / 6

Motronic control unit, coolant temperature senders, charge air
pressure sender, by-pass air cut-off valve, intake air
temperature sender, charge pressure control solenoid valve
F66 - Coolant shortage indicator switch
F265 - Map-controlled engine cooling thermostat
G2 - Coolant temperature sender
G31 - Charge air pressure sender
G42 - Intake air temperature sender
G62 - Coolant temperature sender
J220 - Motronic control unit
J293 - Radiator fan control unit
N75 - Charge pressure control solenoid valve
N80 - Activated charcoal filter system solenoid valve 1 (pulsed)
N112 - Secondary air inlet valve
N249 - Turbocharger divert air valve
T10 - 10-pin connector, black, connector point, electronics box,
plenum chamber
T10d - 10-pin connector, grey, connector point, A pillar, left
T17d - 17-pin connector, red, connector point, electronics box,
ws = white
plenum chamber
sw = black 220
- Earth connection (sender earth), in engine wiring harness
ro = red
rt = red 269
- Earth connection (sender earth) -1-, in dash panel wiring
br = brown harness
gn = green
327
- Earth connection (sender earth), in engine compartment
bl = blue
gr = grey wiring harness
li = purple
D22
- Connection (via fuse 234), in front right wiring harness
vi = purple
ge = yellow
or = orange
rs = pink
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Audi A4 Current Flow Diagram No. 10 / 7

Motronic control unit, engine speed sender, knock sensor I,
knock sensor II
G28 - Engine speed sender
G61 - Knock sensor I
G66 - Knock sensor II
J220 - Motronic control unit
T3 - 3-pin connector, grey, on engine block
T3a - 3-pin connector, green, on engine block
T3b - 3-pin connector, blue, on engine block
104
- Earth connection, in front right wiring harness (sensor
earth)
220
- Earth connection (sender earth), in engine wiring harness

ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
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Audi A4 Current Flow Diagram No. 10 / 8

Motronic control unit, inlet camshaft timing adjustment valve -1-
, secondary air pump, Hall sender, vacuum pump for brakes
G40 - Hall sender
G294 - Brake servo pressure sensor
J217 - Automatic gearbox control unit
J220 - Motronic control unit
J299 - Secondary air pump relay
J569 - Brake servo relay
N205 - Inlet camshaft timing adjustment valve -1-
S130 - Secondary air pump fuse
T10 - 10-pin connector, black, connector point, electronics box,
plenum chamber
T17d - 17-pin connector, red, connector point, electronics box,
plenum chamber
V101 - Secondary air pump motor
V192 - Vacuum pump for brakes
12
- Earth point, in engine compartment, left

83
- Earth connection -1-, in front right wiring harness

4 2 ws = white 220
- Earth connection (sender earth), in engine wiring harness
sw = black
ro = red D141
- Connection (5V), in engine wiring harness
rt = red
br = brown
* - Only applies to models with automatic gearbox (AG5 or
gn = green multitronic 01J)
bl = blue ** - Only applies to models with automatic gearbox (multitronic
gr = grey
01J), up to model year 2003
li = purple
B vi = purple *** - Only applies to models with automatic gearbox (multitronic
ge = yellow 01J), from model year 2004
or = orange
rs = pink
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Audi A4 Current Flow Diagram No. 10 / 9

Motronic control unit, accelerator pedal position senders,
throttle valve module
F - Brake light switch
F36 - Clutch pedal switch
G79 - Accelerator pedal position sender
G185 - Accelerator pedal position sender -2-
J220 - Motronic control unit
J338 - Throttle valve module
J527 - Steering column electronics control unit
T16a - 16-pin connector, black, on steering column electronics
control unit
T17e - 17-pin connector, white, connector point, electronics box,
plenum chamber
A18
- Connection (54), in dash panel wiring harness

A20
- Connection (15a), in dash panel wiring harness

A154
- Connection (brake pedal switch), in dash panel wiring
harness
* - Only applies to models with manual gearbox

ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
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Audi A4 Current Flow Diagram No. 10 / 10

Motronic control unit, lambda probes
G39 - Lambda probe
G130 - Lambda probe downstream of catalytic converter
J220 - Motronic control unit
J234 - Airbag control unit
T4 - 4-pin connector, brown, connector point, lambda probe
(bulkhead)
T6 - 6-pin connector, black, connector point, lambda probe
(bulkhead)
T17d - 17-pin connector, red, connector point, electronics box,
plenum chamber
Z19 - Lambda probe heater
Z29 - Lambda probe 1 heater, downstream of catalytic
converter
200
- Earth connection (screening), in engine compartment
wiring harness
A125
- Connection (crash signal), in dash panel wiring harness
* - As of model year 2003 no longer fitted (phased-in
modification)
ws = white
sw = black
ro = red
rt = red
br = brown
gn = green
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink
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Audi A4 Current Flow Diagram No. 10 / 11

Motronic control unit, ignition coils
J217 - Automatic gearbox control unit
J220 - Motronic control unit
N70 - Ignition coil 1 with output stage
N127 - Ignition coil 2 with output stage
N291 - Ignition coil 3 with output stage
N292 - Ignition coil 4 with output stage
P - Spark plug connector
Q - Spark plugs
T10 - 10-pin connector, black, connector point, electronics box,
plenum chamber
T10a - 10-pin connector, brown, connector point, electronics box,
plenum chamber
T16 - 16-pin connector, black, diagnostic connector
T17d - 17-pin connector, red, connector point, electronics box,
plenum chamber
18
- Earth point, on cylinder block

83
- Earth connection -1-, in front right wiring harness

A76
- Connection (diagnosis wire K), in dash panel wiring
ws = white harness
sw = black
ro = red A121
- Connection (high bus), in dash panel wiring harness
rt = red
br = brown A122
- Connection (low bus), in dash panel wiring harness
gn = green
bl = blue D23
- Connection (via fuse 229), in front right wiring harness
gr = grey * - Only applies to models with automatic gearbox (multitronic
li = purple
vi = purple 01J), up to model year 2003
ge = yellow ** - Only applies to models with five-speed automatic gearbox
or = orange (AG5)
rs = pink
*** - Only applies to models with automatic gearbox (multitronic
01J), from model year 2004
• - Data bus wire (CAN bus)
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Audi A4 Current Flow Diagram No. 10 / 12

Control unit with display in dash panel insert, oil pressure
switch, oil level/oil temperature sender, fuel pump, fuel gauge
sender -2-
F1 - Oil pressure switch
G - Fuel gauge sender
G6 - Fuel pump (pre-supply pump)
G169 - Fuel gauge sender -2-
G266 - Oil level/oil temperature sender
J285 - Control unit with display in dash panel insert
K2 - Alternator warning lamp
T10 - 10-pin connector, black, connector point, electronics box,
plenum chamber
T10a - 10-pin connector, brown, connector point, electronics box,
plenum chamber
T32 - 32-pin connector, blue, on dash panel insert
T32a - 32-pin connector, green, on dash panel insert
83
- Earth connection -1-, in front right wiring harness

249
- Earth connection -2-, in interior wiring harness

269
- Earth connection (sender earth) -1-, in dash panel wiring
ws = white harness
sw = black - Connection (61), in dash panel wiring harness
ro = red A17
rt = red - Connection (15a, fuse 5), in dash panel wiring harness
br = brown A74
gn = green * - Only models with four-wheel drive
bl = blue
gr = grey
li = purple
vi = purple
ge = yellow
or = orange
rs = pink