Audi Workshop Service and Repair Manuals

Components A to C are not shown in the exploded view.

•     A -    Diagnostic connector
• ◆ In driver's knee restraint
•     B -    Fuel pump relay
• ◆ In micro central electrics behind driver's storage compartment, relay position 4
•     C -    "EPC" warning lamp
• ◆ In dash panel insert

• Activated charcoal filter system solenoid valve 1 -N80
• Air-mass meter -G70
• Lambda probe downstream of catalytic converter -G130, 55Nm(bank 1 / probe 2, 4-pin, visible from below, do not confuse with exhaust-gas temperature sender -G235 (2-pin) and NOx sender (cable enters passenger compartment via rubber grommet).

• Coolant temperature sender -G62 (4-pin)
• Fuel-pressure regulating valve -N276
• Single-plunger high-pressure pump
• Vacuum pump
• Camshaft adjustment valve 1 -N205
• Throttle valve control unit -J338
• ◆ With throttle valve drive -G186, throttle valve drive angle sender -G187 and throttle valve drive angle sender 2 -G188
• Exhaust-gas recirculation valve -N18 with exhaust-gas recirculation potentiometer -G212

• Motronic current supply relay -J271 (see current flow diagram)
• Engine control unit
• ◆ In electronics box in plenum chamber on left
• Engine speed sender -G28
• Knock sensor 2 -G66
• ◆ Tightening torque: 20 Nm
• 3-pin connector
• ◆ For knock sensor 1 -G61 (green)
• 3-pin connector
• ◆ For knock sensor 2 -G66 (blue)
• 8-pin connector for injectors
• 10-pin connector for intake manifold flap motor -V157, oil pressure switch and for map-controlled engine cooling thermostat -F265

• 3-pin connector
• ◆ For engine speed sender -G28 (grey)
• 4-pin connector
• ◆ For lambda probe downstream of catalytic converter -G130 and lambda probe heater -Z29 (brown)
• 6-pin connector
• ◆ For lambda probe upstream of catalytic converter -G39 and lambda probe heater -Z19 (black)
• Knock sensor 1 -G61
• ◆ Tightening torque: 20 Nm
• Fuel-pressure sender -G247
• Intake manifold flap motor -V157 with intake manifold flap potentiometer -G336
• Intake manifold changeover valve
  -N156

• Intake manifold pressure sender -G71 / elevation sender -F96 with intake-air temperature sender -G42
• Map-controlled engine cooling thermostat -F265
• Injectors
• ◆ Cylinder 1 -N30
• ◆ Cylinder 2 -N31
• ◆ Cylinder 3 -N32
• ◆ Cylinder 4 -N33

Injectors are high-pressure injectors. They inject fuel at high pressure (max. 110 bar approx.) directly into cylinder.

• Phase sensor (Hall sender) -G40

• Ignition coils with output stages
• ◆ Cylinder 1 -N70
• ◆ Cylinder 2 -N127
• ◆ Cylinder 3 -N291
• ◆ Cylinder 4 -N292
• Lambda probe upstream of catalytic converter -G39, 55Nm

→ Fig.1    Fitting location of exhaust-gas temperature sender -G235 and NOx sender -G295 ("NOx" means nitrogen oxide). Do not confuse exhaust-gas temperature sender or NOx sender with lambda probe downstream of catalytic converter. Lambda probe downstream of catalytic converter is much closer to engine.

•     1 -    Exhaust-gas temperature sender -G235 (tightening torque of union nut: 45 Nm)
•     2 -    NOx sender -G295 ("NOx" means nitrogen oxide), tightening torque: 63 Nm

→ Fig.2    Fitting location of control unit for NOx sender -J583, under carpet under driver's seat; control unit for NOx sender -J583 is permanently connected to NOx sender -G295 via a cable. Control unit for NOx sender can only be accessed after removal of B-pillar trim on driver's side, rear seat bench and driver's seat. This work is described in Workshop Manual "General Body Repairs, Interior".

•     1 -    Control unit for NOx sender -J583 ("NOx" means nitrogen oxide); arrow indicates direction of travel.

→ Fig.3    Fitting location of -G83

•     1 -    Coolant temperature sender - radiator outlet -G83 (accessed from below, next to air conditioner compressor)

→ Fig. 4    Fitting location of engine control unit in plenum chamber electronics box

→ Fig. 5    Fitting location of brake light switch -F, brake pedal switch -F47 and clutch pedal switch -F36

•     1 -    Brake light switch -F, brake pedal switch -F47
•     2 -    Clutch pedal switch -F36

Note:

Switches are only to be fitted once so as to ensure a firm fit.

Switch adjustment:

=> Brake System; Repair Group 46

→ Fig. 6    Fitting location of accelerator pedal position sender -G79 and accelerator pedal position sender 2 -G185