light AUDI A4 1997 B5 / 1.G APB Engine Charge Air System With Turbocharger Workshop Manual

21-11


Notes: - Switch on turbocharger tester and set measuring range selector switch
to position -I- (absolute pressure).
- Connect measuring hose to connection -I-.
Hose connections must be completely airtight, otherwise
measurements will not be correct. Ensure that measuring hose is not pinched at hood or side window.Pressing memory key M on turbocharger tester will store the last
measured value until memory key M is pressed again or tester is
switched off. The decimal point in the display flashes to indicate that the value is
being stored. If the battery voltage of the turbocharger tester drops below the
minimum level, an arrow will appear at the top left of the display. Before performing the test, drive the vehicle at a brisk speed for at
least 3 km (without stopping at traffic lights etc.). A second mechanic is required to note the readings on the tester
when the vehicle is moving. Observe safety notes Page 21
-9 .
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21-23

Checking voltage supply

Note:
Voltage is supplied to the recirculation valve via
the Fuel Pump (FP) relay.

Test requirement:

Fuse for recirculation valve OK

- Disconnect connector at valve.

- Connect VAG1527B voltage tester as follows:Harness connector terminal
Measure to
1 Engine Ground (GND)
- Operate starter briefly.

LED must light.
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21-24
If LED does not light:

- Check wire connection from terminal 1 to Fuel
Pump (FP) relay via fuse for open circuit.

Electrical Wiring Diagrams, Troubleshooting &
Component Locations
- Repair open circuit if necessary.
If wire connection is OK:

- Check Fuel Pump (FP) relay.

Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 24

If LED lights:

- Check activation, Page 21
-25
.
Pa
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11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.GE05.21.1