S6 V8-4.2L (BBD) (2004)
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If the fuse is OK:
-
Check for open circuit and short in wiring between fuel pump relay and socket 1 on connector via fuse for intake manifold changeover solenoid
valve.
If the voltage supply is OK, check actuation.
-
Re-insert fuel pump relay and fuse.
Checking actuation of intake manifold change-over valve
-
Connect diode test lamp VAG 1527 between sockets 1 and 2 on connector for intake manifold change-over valve using cables from adapter set
VAG 1594.
-
Perform output Diagnostic Test Mode (DTM) and actuate solenoid valve for intake manifold change-over. See: Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Manufacturer's Scan Tool/Output Diagnostic Test
Mode (DTM) (Function 03)
Indicated on display
Output Diagnostic Test Mode
->
Intake manifold change-over valve -N156-
If the diode test lamp does not flash or is continuously lit:
-
Check wiring.
Checking wiring
-
Connect test box VAG 1598/31 to wiring harness for engine control unit; 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/Connecting VAG 1598/31 Test Box
Check the following wiring connections for open circuit and short circuit to positive or Ground.
Connector for intake
manifold change-over 1 socket
Test box VAG 1598/31 socket
2
48
Wire resistance: max. 1.5 Ohm
If wiring is OK:
-
Replace engine control module.
-
Check intake manifold change-over again for function. See: Engine, Cooling and Exhaust/Engine/Intake Manifold/Testing and Inspection/Intake
Manifold Change-Over, Checking
-
Read readiness code. Generate readiness code again if DTC memory was erased. See: Computers and Control Systems/Testing and
Inspection/Monitors, Trips, Drive Cycles and Readiness Codes/Audi Drive Cycle/Readiness Code/With Manufacturer's Scan Tool/Readiness
Code, Generating
