Jetta GL L4-1.9L DSL Turbo (ALH) (2001)
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Bridge following sockets with auxiliary cables from VAG1594:
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Through MY 1999: 33 + 1
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From MY 2000 : 18 + 4
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Measure voltage between following sockets:
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Through MY 1999 : 2 + 1, 28 + 1, 27 + 2 and 28 + 27
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From MY 2000 : 4 + 1, 2 + 4, 5 + 1 and 5 + 2
Specification: approx. battery voltage
If specification not obtained:
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Check voltage supply relay terminal 30 (B+) -J317-.
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Check wiring connections for open circuit, short circuit and transfer resistance at contacts according to wiring diagram.
If wiring and relay are ok:
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Replace Engine Control Module (ECM) -J248-.
With Generic Scan Tool
Voltage supply for Diesel-Direct Fuel Injection System, checking
Recommended special tools and equipment
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VAG1526 multimeter or VAG1715 multimeter
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VAG1594 connector test kit
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Wiring diagram
Test requirements
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The respective fuses of Diesel-Direct fuel injection system must be OK:
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Generator (GEN) OK.
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Battery voltage must be at least 11.5 Volts.
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All electrical consumers such as, for example, lights and rear window defroster must be switched off.
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For vehicles with automatic transmission, selector lever must be in position -P- or -N-.
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If vehicle is equipped with an A/C system, it must be switched off.
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Ground (GND) connections between engine and chassis must be OK.
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: 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.
