Jetta L4-1.9L DSL Turbo (BEW) (2004)
Test sequence
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Switch ignition off.
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Connect test box to control module wiring harness, connect test box for wiring test. See: Computers and Control Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring
Test
Vehicles with 80-pin control module
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Bridge sockets 33 + 1 using adapter cables from V.A.G 1594.
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Switch ignition on.
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Measure voltage between the following sockets: 2+1, 28+1, 27+2 and 28+27
Specified value: approx. battery voltage
Vehicles with 121-pin control module
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Measure voltage between the following sockets:
1/2 and 4/5
37 and 4/5
Specified value: about 0 V
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Switch ignition on.
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Measure voltage anew between the following sockets:
1/2 and 4/5
37 and 4/5
Specified value approx. battery voltage
Continuation for all vehicles
If specified value is not obtained:
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Check Power Supply (Terminal 30, B+) Relay - J317-.
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Check wire connections at the terminal locations for open circuit, short circuit and contact resistances according to wiring diagram.
If no malfunctions are detected in wires and at relay:
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Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-
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Erase DTC memory of control module for Diesel- Direct fuel injection system, Diagnostic mode 4: Reset/erase diagnostic data. See: Computers
and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Mode, Selecting/Diagnostic Mode 4: Reset/Erase
Diagnostic Data
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Generate readiness code. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes