New Beetle L4-1.8L Turbo (AWV) (2005)
Engine Control Module: Component Tests and General Diagnostics
Voltage Supply For Engine Control Module (ECM), Checking
Recommended special tools and equipment
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V.A.G 1526 multimeter or V.A.G 1715 multimeter
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V.A.G 1594 connector test kit
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Wiring diagram
Test requirements
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The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK.
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Fuel Pump (FP) Relay -J17- must be OK, check.
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Generator (GEN) must be OK, checking.
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Battery voltage must be at least 11.5 volts.
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All electrical consumers such as: lights and rear window defroster must be switched off.
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Parking brake must be engaged or else day time driving lights will be switched on.
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If vehicle is equipped with an A/C system, it must be switched off.
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For vehicles with automatic transmission, selector lever must be in -P-.
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Ground (GND) connections between engine and chassis must be OK.
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Ignition switched off.
Test sequence
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Connect test box to control module wiring harness. connect test box for wiring test. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/Test Box, Connecting For Wiring Test
Checking voltage supply at terminal 30
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Measure voltage supply between sockets 1 + 62 and 2 + 62 of test box.
Specified value: at least 11.5V
If specified value is not obtained:
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Check wire connections to relay carrier and Ground (GND) connection of Engine Control Module (ECM) according to wiring diagram.
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Erase DTC memory of Engine Control Module (ECM). Diagnostic mode 4: Reset/erase diagnostic data. See: Powertrain Management/Computers
and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/Diagnostic Mode 4: Reset/Erase
Diagnostic Data
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Generate readiness code.
Checking voltage supply at terminal 15
Vehicles with engine code APH, AWP, AWV
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Measure voltage supply between sockets 1+3 and 2 + 3 of test box.
Vehicles with engine code BKF, BNU
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Measure voltage supply between sockets 1+21 and 2 + 21 of test box.
Continue for all vehicles
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Switch ignition on.
Specified value: at least 11.5V