A6 V6-3.0L (AVK) (2004)
Checking power supply
Test requirements:
-
Fuse for injectors OK
-
Fuel pump relay OK; See: Fuel Pump/Fuel Pump Relay/Testing and Inspection
NOTE: The injectors receive their power supply via the fuel pump relay.
-
Connect voltage tester VAG 1527B as follows:
Connector
Measure to
terminal
1
Engine ground
-
Switch ignition on.
-
LED should illuminate.
If the LED does not illuminate:
-
Check wiring connection between terminal 1 and fuse for injector for open circuit:
-
Repair open circuit, if necessary.
If the LED illuminates:
Checking activation
Test requirements:
-
Internal resistance of the valve OK
-
Connect voltage tester VAG 1527 B with measuring probes and plug-in adapters from VAG 1594 A between terminal 2 (signal) and terminal 1
(positive); the connector remains plugged in.
-
Operate starter briefly (engine may start).
-
LED should flash.
NOTE: Voltage testers with a low current draw continue to glow faintly between activation from the engine control module (rather than extinguishing
completely) and become slightly brighter when activated.
If LED does not flash:
-
Connect test box VAG 1598/31 to wiring harness for engine control module; do not connect engine control module. See: Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Manufacturer's Scan Tool/Scan Tool Connecting and
Initial Checks/Wiring and Component Testing Using VAG1598/31 Test Box