ignition AUDI A4 1999 B5 / 1.G APB Engine Valve Gear Service User Guide

15-70

- Initiate output Diagnostic Test Mode (DTM) and
activate the valve for camshaft adjustment.

Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01

If valves do not click during output Diagnostic
Test Mode (DTM):

Checking internal resistance

- Switch ignition off.

- Remove bolts (arrows) and remove engine covers -A- and -B-.

- Remove air distributor (arrows).
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Electrical Wiring Diagrams, Troubleshooting & Component Locations
If no malfunctions are detected:
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 24

Check wire connection from terminal 1 of connector via fuse -S234-
(in fuse holder, socket 34) to Fuel Pump (FP) relay for open circuit:
- Repair open circuit if necessary.
- Check Fuel Pump (FP) relay.
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15-73

Checking activation

Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 01

If LED does not blink or if it remains constantly lit:
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 24
- Connect VAG 1527B voltage tester between terminal 1 (+) and 2.
- Initiate output Diagnostic Test Mode (DTM) and activate valve for
camshaft adjustment.

LED must blink.
- Connect VAG 1598/31 test box at wiring harness to ECM, do not
connect ECM.
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Valve 1 for camshaft adjustment -N205- and valve 2 for camshaft
adjustment -N208-
If wire connection is OK:
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition, Engine Code(s): APB, Repair Group 24

If no malfunctions are detected: - Check following wire connections for open circuit and short circuit to
Ground (GND) and B+:
Harness connector
terminal
VAG 1598/31 or test box
Bushing
2 Electrical Wiring Diagrams, Troubleshooting
&Component Locations
- Repair Ground (GND) connection or open circuit if necessary.
- Replace Engine Control Module (ECM).- Replace mechanical camshaft adjuster.
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11/21/2002 htt
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