AUDI A3 2001 — 1.9 litre turbo-diesel engine, 74 kW, TDI unit injector, 4-cylinder, engine code ATD . Wiring diagrams, Pin Connector, Location

Wiring Diagram AUDI A3 2001 - Battery - starter - alternator - main fuse box/battery

A	Battery
B	Starter
C	Alternator
C1	Voltage regulator
J226	Starter inhibitor and reversing light relay
S131	Fuse 1
S132	Fuse 2
S133	Fuse 3
S134	Fuse 4
S138	Fuse 5
S162	Fuse -1- (30), in fuse box/battery
S163	Fuse -2- (30), in fuse box/battery
S164	Fuse -3- (30), in fuse box/battery
T2f	2-pin connector, alternator, wiring duct, in engine compartment, left
T3e	3-pin connector, black, on main fuse box
T6m	6-pin connector, brown, engine compartment, in plenum chamber
2	Earth strap, gearbox - body
12	Earth point, in engine compartment, left
156	Earth connection, in diesel direct injection wiring harness
*	Only models with manual gearbox
**	Only models with automatic gearbox

Wiring Diagram AUDI A3 2001 - Fuse box - ignition/starter switch

D	Ignition/starter switch
S5	Fuse in fuse box/relay plate
S7	Fuse in fuse box/relay plate
S10	Fuse in fuse box/relay plate
S11	Fuse in fuse box/relay plate
S13	Fuse in fuse box/relay plate
S228	Fuse in fuse box
S229	Fuse in fuse box
S232	Fuse in fuse box
S234	Fuse in fuse box
S243	Fuse in fuse box
T6m	6-pin connector, brown, engine compartment, 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
B156	Positive (+) connection (30a), in interior wiring harness
*	Only models with manual gearbox

Wiring Diagram AUDI A3 2001 - Relay and control unit for diesel direct injection system - glow plugs (engine) - relay for glow plugs - coolant heater elements

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	Coolant heating elements
T2n	2-pin connector, wiring duct, in engine compartment, left
T6m	6-pin connector, brown, engine compartment, in plenum chamber
T10g	10-pin connector, blue, engine compartment, in plenum chamber
156	Earth connection, in diesel direct injection wiring harness
A98	Positive (+) connection -4- (30), in dash panel wiring harness
D78	Positive (+) connection -1- (30a), in engine compartment wiring harness
D102	Connection -2-, in engine compartment wiring harness
F32	Connection (coolant heating elements), in diesel direct injection system wiring harness
*	Only models with heater elements (manual gearbox)

Wiring Diagram AUDI A3 2001 - Intake manifold pressure sender - intake manifold temperature sender - air mass meter - diesel direct injection system control unit - valves for exhaust gas recirculation and intake manifold flap - charge pressure control 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	Intake manifold flap change-over valve
T6m	6-pin connector, brown, engine compartment, in plenum chamber
T10	10-pin connector, white, engine compartment, in plenum chamber
T10c	10-pin connector, in engine compartment, right
T14	14-pin connector, in engine compartment, right
A15	Positive (+) connection (15), in dash panel wiring harness
A100	Connection -2- (87), in dash panel wiring harness
D101	Connection -1-, in engine compartment wiring harness
*	Only applies to models with engine codes ASZ, ASZ (quattro)

Wiring Diagram AUDI A3 2001 - Coolant temperature senders - engine speed sender - fuel temperature sender - Hall sender - diesel direct injection system control unit

E87	Control and display unit for air conditioner/Climatronic
G2	Coolant temperature sender
G28	Engine speed sender
G40	Hall sender
G62	Coolant temperature sender
G81	Fuel temperature sender
J217	Automatic gearbox control unit
J248	Diesel direct injection system control unit
T3d	3-pin connector, white, engine speed sender, in engine compartment
T10x	10-pin connector, orange, engine compartment, in plenum chamber
T14	14-pin connector, in engine compartment, right
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
*	Only models with automatic gearbox
**	Only models with air conditioner

Wiring Diagram AUDI A3 2001 - Kick-down switch - idling switch - accelerator pedal position sender - fuel pump relay - diesel direct injection system control unit - unit injector solenoid valves (cylinders No. 1 - 4)

E3	Hazard warning light switch
F8	Kick-down switch
F60	Idling switch
G79	Accelerator pedal position sender
J17	Fuel pump relay
J248	Diesel direct injection system control unit
N240	Unit injector solenoid valve, No. 1 cyl.
N241	Unit injector solenoid valve, No. 2 cyl.
N242	Unit injector solenoid valve, No. 3 cyl.
N243	Unit injector solenoid valve, No. 4 cyl.
T8h	8-pin connector, in engine compartment
T10	10-pin connector, white, engine compartment, in plenum chamber
T10g	10-pin connector, blue, engine compartment, 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 2001 - Cruise control system switch - clutch pedal switch - cruise control system brake pedal switch (diesel direct injection system) - diesel direct injection system control unit - heater element (crankcase breather)

E45	Cruise control system switch
F	Brake light switch
F36	Clutch pedal switch
J248	Diesel direct injection system control unit
N79	Heater element (crankcase breather)
T6m	6-pin connector, brown, engine compartment, in plenum chamber
T7	7-pin connector, cruise control system, behind steering column switch trim
T10	10-pin connector, white, engine compartment, in plenum chamber
T10e	10-pin connector, black, engine compartment, in plenum chamber
T10x	10-pin connector, orange, engine compartment, 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
*	Only models with cruise control system
**	Only models with manual gearbox
***	Only models with heater elements (manual gearbox) and export versions (northern countries)

Wiring Diagram AUDI A3 2001 - Radiator fan thermo-switches - diesel direct injection system control unit - radiator fan run-on relay - radiator fan

F18	Radiator fan thermo-switch
F54	Radiator fan thermo-switch
J248	Diesel direct injection system control unit
J397	Radiator fan run-on relay
T10	10-pin connector, white, engine compartment, in plenum chamber
T10x	10-pin connector, orange, engine compartment, in plenum chamber
T16	16-pin connector, black, centre console compartment (diagnostic connector)
V7	Radiator fan
11	Earth point, in battery box
A45	Connection (engine speed signal), in dash panel wiring harness
A68	Connection (30, air conditioner), in dash panel wiring harness
A76	Connection (diagnosis wire K), in dash panel wiring harness
A121	Connection (high bus), in dash panel wiring harness
A122	Connection (low bus), in dash panel wiring harness
L26	Connection (radiator fan), in engine compartment - Climatronic wiring harness
•	CAN bus (data wire)

Wiring Diagram AUDI A3 2001 - Combi-processor in dash panel insert - fuel pump

F1	Oil pressure switch
F66	Coolant shortage indicator switch
G	Fuel gauge sender
G6	Fuel pump (pre-supply pump)
G22	Speedometer sender (Hall sender, on gearbox)
J218	Combi-processor in dash panel insert
K2	Alternator warning lamp
K29	Glow period warning lamp (00626)
T14	14-pin connector, in engine compartment, right
T32	32-pin connector, blue, on dash panel insert
T32a	32-pin connector, green, on dash panel insert
277	Earth connection -3-, in interior wiring harness
278	Earth connection -4-, in interior wiring harness
281	Earth connection -1-, in engine prewiring wiring harness
A23	Connection (30al), in dash panel wiring harness
A80	Connection -1- (X), in dash panel wiring harness
B149	Positive (+) connection -2- (15a), in interior wiring harness
B178	Connection (speed signal), in interior wiring harness