Jetta GL Wagon L4-1.9L DSL Turbo (ALH) (2002)
Engine Control Module: Component Tests and General Diagnostics
With Manufacturer's Scan Tool
Diesel Direct Injection System Voltage Supply, Checking
Special tools and equipment
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Test box VAG 1598/31
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Hand multimeter VAG 1526 or multimeter VAG 1715
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Adapter set VAG 1594
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Wiring diagram
Check conditions
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The fuses must be OK.
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The battery voltage must be at least 11.5 V.
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All electrical accessories, e.g. lights and rear window heating must be switched off.
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A/C switched off.
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Alternator OK, checking.
Test sequence
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Switch off ignition.
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Remove wiper arms and plenum cover.
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Connect test box VAG 1598/31 to control unit and wiring harness.
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Measure voltage between following sockets:
1/2 and 4/5
37 and 4/5
Specification: Approx. 0 V
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Switch on ignition.
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Again measure voltage between sockets:
1/2 and 4/5
37 and 4/5
Specification approx. battery voltage
If the specifications are not obtained:
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Check voltage supply relay terminal 30 -J317-.