light AUDI A4 1998 B5 / 1.G AWM Engine Motronic Injection System Servicing Workshop Manual

24-8


10 -
Instrument cluster
with exhaust Malfunction Indicator Lamp
(MIL). Notes for Malfunction Indicator Lamp
(MIL) Page 01
-3
with Electronic Power Control (EPC)
warning lamp -K132- (EPC warning lamp).
Significance of EPC warning lamp Page 24
-122

11 -
Throttle Position (TP) sensor -G79- and
sender 2 for accelerator pedal position -
G185-
Component location Fig. 5
, Page
24
-15

Checking Page 24
-138
Adapt kick down function Page 24
-145
12 -
Brake light switch -F- and brake pedal
switch -F47-
Component location Fig. 3
, Page
24
-14

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24-14


Note:
In order to assure sufficiently secure fitting, switches must not be installed
more than once.
Adjusting switch:
Repair Manual, Brake System, Repair Group 46; Brake booster, removing and installing
Fig. 3 Installation location of brake light switch -F- and brake
pedal switch -F47-, clutch vacuum vent valve switch -F36-
1 - Clip
2 - Clutch vacuum vent valve switch -F36-
3 - Brake light switch -F-, brake pedal switch -F47-

Note:
Illustration depicts intake manifold removed, from below. Fig. 4 Installation location of Secondary Air Injection (AIR)
solenoid valve-N112- and recirculating valve for
turbocharger-N249-
Installation location: Below intake manifold
1 - Recirculating valve for turbocharger -N249-
2 - Secondary Air Injection (AIR) solenoid valve -N112-
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24-39

Checking voltage supply

Test requirements:

Fuse for fuel injectors OK

Electrical Wiring Diagrams, Troubleshooting &
Component Locations

Fuel Pump (FP) relay OK; checking Page 24
-52
.

- Disconnect harness connector at the fuel
injector to be tested.

If LED does not light up: - Connect VAG1527B voltage tester as follows:Harness connector
Terminal
Measure to
1 Engine Ground (GND)
- Switch ignition on.

LED must light up.
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24-40

- Repair open circuit if necessary.
If LED lights up:

- Activation of fuel injectors, checking

Checking activation

Test requirement:

Internal resistance of valve OK

- Slide back rubber grommet of fuel injector
connector, but leave connector connected.

Note:
Voltage testers do not go out completely during low current pick-up
between activations by the ECM, but rather continue to glow a little and
then get slightly brighter during activation. - Connect VAG1527B voltage tester between sockets 2 (signal) and 1
(B+).
- Operate starter briefly (engine can also start).

LED must blink.
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24-46

- Disconnect fuel distributor with injectors from
intake plenum and set aside in rear of engine
compartment on a clean cloth.

WARNING!

Fuel system is under pressure! Before
opening system, place rags around the
connection point. Then release pressure by
carefully loosening connection.

- Disengage retaining clip and remove fuel
injector.

Note:
Fuel lines must be removed before replacing fuel
distributor.
Installation is reverse of removal, noting the
following:

Remove O-rings at all opened connections.
(Never remove plastic cap from valve head
ro replace front O-ring - pry O-ring off over
plastic cap).
Lightly lubricate O-rings with clean engine
oil.
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