A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
1
Engine Ground (GND)
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Switch ignition on.
Specified value: approx. battery voltage
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Switch ignition off.
If there is no voltage again:
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Check wire connection from terminal 1 of harness connector via fuse to Motronic Engine Control Module (ECM) Power Supply Relay -J271- for
open circuit according to wiring diagram.
Specified value: Wire resistance max 1.5 Ohms
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If necessary, repair wire connection.
If voltage supply is OK.
Checking control wire
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Connect test box to wiring harness of Engine Control Module (ECM). ECM is not connected. See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Generic Scan Tool/Scan Tool
Connecting/Test Box, Connecting For Wiring and Component Test
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Check the following wire connections for open circuit according to wiring diagram.
Harness connector Terminal
Test box Socket
2
115
Specified value: Wire resistance max 1.5 Ohms
-
Check wires for short circuit to each other as well as to B+ and Ground (GND).
Specified value: Infinite Ohms (no continuity)
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If necessary, repair wire connection.
If no malfunctions are found in wires:
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Replace Engine Control Module (ECM).
If no malfunctions are detected:
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Replace mechanical camshaft adjuster.
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check DTC memory. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and
Procedures/Scan Tool Testing/With Generic Scan Tool/Mode 3: Check DTC Memory
2. If necessary, erase DTC memory. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and
Procedures/Scan Tool Testing/With Generic Scan Tool/Mode 4: Reset/Erase Diagnostic Data
3. Generate readiness code. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles
and Readiness Codes/Audi Drive Cycle/Readiness Code/With Generic Scan Tool/Readiness Code, Generating