AUDI A3 2002 — 1.9 l — Diesel engine (74 kW — unit injectors — 4 cylinder), engine code ATD . Wiring diagrams, Pin Connector, Location

Wiring Diagram AUDI A3 2002 - Battery - starter - alternator - fuses

A	Battery
B	Starter
C	Alternator
C1	Voltage regulator
D	Ignition/starter switch
S131	Fuse 1
S132	Fuse 2
S133	Fuse 3
S134	Fuse 4
S138	Fuse 5
S162	Fuse 1 (30) in fuse holder on battery
S163	Fuse 2 (30) in fuse holder on battery
S164	Fuse 3 (30) in fuse holder on battery
T2f	2-pin connector, alternator, in left engine compartment
T3e	3-pin connector, black, on main fuse box
T4b	4-pin connector, in left engine compartment
T6m	6-pin connector, brown, in plenum chamber
2	Earth strap, gearbox - body
12	Earth point, on left in engine compartment
156	Earth connection, in diesel direct injection wiring harness
*	only models with air conditioning system
**	only models without air conditioning system

Wiring Diagram AUDI A3 2002 - Fuses

D	Ignition/starter switch
S5	Fuse in relay plate fuse holder
S7	Fuse in relay plate fuse holder
S10	Fuse in relay plate fuse holder
S11	Fuse in relay plate fuse holder
S13	Fuse in relay plate fuse holder
S16	Fuse in relay plate fuse holder
S228	Fuse in fuse holder
S229	Fuse in fuse holder
S232	Fuse in fuse holder
S234	Fuse in fuse holder
S237	Fuse in fuse holder
S243	Fuse in fuse holder
T6m	6-pin connector, brown, in plenum chamber
A2	Positive connection (15), in dash panel wiring harness
A101	Connection 3 (87), in dash panel wiring harness
B135	Connection 1 (15a), in interior wiring harness
B138	Positive connection (X), in interior wiring harness
B146	Positive connection 1 (87), in interior wiring harness
*	for models with four-wheel drive only, from July 2001
**	is dropped from November 2001
***	applicable from November 2001

Wiring Diagram AUDI A3 2002 - Diesel direct injection system control unit - diesel direct injection system relay - glow plug relay - engine glow plugs - glow plugs - coolant

J52	Glow plug relay
J248	Diesel direct injection system control unit
J322	Diesel direct injection system relay
J359	Low heat output relay
J360	High heat output relay
Q6	Glow plugs - (engine)
Q7	Glow plugs, coolant
T2n	2-pin connector, cable channel, in left engine compartment
T6m	6-pin connector, brown, in plenum chamber
T10g	10-pin connector, blue, in plenum chamber
156	Earth connection, in diesel direct injection wiring harness
A98	Positive connection 4 (30), in dash panel wiring harness
B156	Positive connection (30a), in interior wiring harness
D78	Positive connection 1 (30a), in engine compartment wiring harness
D102	Connection 2, in engine compartment wiring harness
F32	Connection (glow plugs, coolant) in diesel direct injection system wiring harness
*	for models with heated pin heating only (manual gearbox)

Wiring Diagram AUDI A3 2002 - Diesel direct injection system control unit - air mass meter - intake manifold pressure sender - intake manifold temperature sender - solenoid valve

G70	Air mass meter
G71	Intake manifold pressure sender
G72	Intake manifold temperature sender
J248	Diesel direct injection system control unit
N18	Exhaust gas recirculation valve
N75	Charge pressure control solenoid valve
N239	Variable intake manifold flap change-over valve
T6m	6-pin connector, brown, in plenum chamber
T10	10-pin connector, white, in plenum chamber
T10c	10-pin connector, black, in left engine compartment
A15	Positive connection (15), in instrument panel wiring harness
A100	Connection 2 (87), in dash panel wiring harness
D101	Connection 1, in engine compartment wiring harness
*	for engine code ASZ only
**	for models with heater elements only
***	for models without heater elements only

Wiring Diagram AUDI A3 2002 - Diesel direct injection system control unit - coolant temperature sender - fuel temperature sender - Hall sender

E87	operating and display unit for air conditioning system/Climatronic
G2	Coolant temperature sender
G28	Engine speed sender
G40	Hall sender
G62	Coolant temperature sender
G81	Fuel temperature sender
J248	Diesel direct injection system control unit
T3n	3-pin connector, grey, speed sender, in engine compartment
T10x	10-pin connector, orange, in plenum chamber
T14	14-pin connector, in left engine compartment
269	Earth connection (sender earth) 1, in dash panel wiring harness
A100	Connection 2 (87), in dash panel wiring harness
F27	Connection (screening), in diesel direct injection wiring harness
*	is dropped from November 2001
**	applicable from November 2001
***	for models with air conditioning system only

Wiring Diagram AUDI A3 2002 - Diesel direct injection system control unit - fuel pump relay - unit injector valves - accelerator position sender

F8	Kick-down switch
F60	Idling speed switch
G79	Accelerator position sender
J17	Fuel pump relay
J234	Airbag control unit
J248	Diesel direct injection system control unit
N240	Unit injector valve, No. 1 cyl.
N241	Unit injector valve, No. 2 cyl.
N242	Unit injector valve, No. 3 cyl.
N243	Unit injector valve, No. 4 cyl.
T8h	8-pin connector, in engine compartment
T10	10-pin connector, white, in plenum chamber
T10g	10-pin connector, blue, in plenum chamber
A125	Connection (crash signal), in dash panel wiring harness
B147	Positive connection 2 (87), in interior wiring harness

Wiring Diagram AUDI A3 2002 - Diesel direct injection system control unit - heater element (crankcase breather) - cruise control system switch - brake pedal switch - clutch pedal switch

E45	Cruise control system switch
F	Brake light switch
F36	Clutch pedal switch
J217	Automatic gearbox control unit
J248	Diesel direct injection system control unit
N79	Heater element for crankcase breather
T6m	6-pin connector, brown, in plenum chamber
T10	10-pin connector, white, in plenum chamber
T10c	10-pin connector, black, in left engine compartment
T10e	10-pin connector, black, in plenum chamber
T10x	10-pin connector, orange, in plenum chamber
156	Earth connection, in diesel direct injection wiring harness
A108	Connection (speed signal), in dash panel wiring harness
B148	Positive connection 3 (87), in interior wiring harness
B185	Connection 2 (54), in interior wiring harness
*	for models with CCS only
**	for manual gearbox only
***	for models with heater elements only
****	for automatic gearbox only

Wiring Diagram AUDI A3 2002 - Diesel direct injection system control unit - radiator fan

F18	Thermal switch for radiator fan
F54	Thermal switch for radiator fan
J217	Automatic gearbox control unit
J248	Diesel direct injection system control unit
J397	Radiator fan run-on relay
T10	10-pin connector, white, in plenum chamber
T10x	10-pin connector, orange, in plenum chamber
V7	Radiator fan
11	Earth point, in battery box
A45	Connection (RPM signal), in dash panel wiring harness
A68	Connection (30, air conditioning system), in dash panel wiring harness
L26	Connection (radiator fan), in engine compartment - Climatronic wiring harness
*	is dropped from July 2001, engines with four-wheel gearbox
**	for automatic gearbox only
●	CAN bus (data bus)

Wiring Diagram AUDI A3 2002 - Radiator fan control unit

F18	Radiator fan thermal switch
F54	Thermal switch for radiator fan
J248	Diesel direct injection system control unit
J293	Radiator fan control unit
T4p	4-pin connector, on radiator fan control unit
T6q	6-pin connector, on radiator fan control unit
T10	10-pin connector, white, in plenum chamber
V7	Radiator fan
V35	Right fan for radiator
11	Earth point, in battery box
188	Earth connection 3, in air conditioning system wiring harness
L26	Connection (radiator fan), in engine compartment - Climatronic wiring harness
L43	Connection (radiator fan), in air conditioning system/radiator fan wiring harness
*	applicable from July 2001, engines with four-wheel gearbox

Wiring Diagram AUDI A3 2002 - Combi-processor in dash panel insert - oil pressure switch - fuel gauge sender - fuel pump (pre-supply pump)

F1	Oil pressure switch
G	Fuel gauge sender
G6	Fuel pump (pre-supply pump)
J218	Combi-processor in dash panel insert
J533	Data bus diagnostic interface
T14	14-pin connector, in left engine compartment
T16	16-pin connector, black, shelf centre console (diagnostic connector)
T32	32-pin connector, blue, on dash panel insert
T32a	32-pin connector, green, on dash panel insert
269	Earth connection (sender earth) 1, in dash panel wiring harness
277	Earth connection 3, in interior wiring harness
A76	Connection (diagnosis wire K), in dash panel wiring harness
A80	Connection 1 (X), in dash panel wiring harness
A121	Connection (high bus), in dash panel wiring harness
A122	Connection (low bus), in dash panel wiring harness

Wiring Diagram AUDI A3 2002 - Combi-processor in dash panel insert - speedometer sender - oil level and oil temperature sender

G22	Speedometer sender (Hall sender, on gearbox)
G266
J218	Combi-processor in dash panel insert
K2	Alternator warning lamp
K29	Glow period warning lamp
T14	14-pin connector, in left engine compartment
T32	32-pin connector, blue, on dash panel insert
T32a	32-pin connector, green, on dash panel insert
10	Earth point, in plenum chamber
A23	Connection (30al), in dash panel wiring harness
B149	Positive connection 2 (15a), in interior wiring harness
B178	Connection (speed signal), in interior wiring harness