Beetle L4-1781cc 1.8L Turbo (APH) (1999)
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Connect VAG 1598/31 test box to control module wiring harness. Motronic Engine Control Module (ECM) -J220- is not connected by this action.
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Check wiring for open circuit between test box and connector using Electrical Wiring Diagram.
terminal 3 + socket 39
Wire resistance: Max. 1.5 Ohms
If the specification is obtained:
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Additionally check wires for short to one another.
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Additionally check wiring for short to battery positive or Ground (GND).
If no wiring malfunction is found:
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Replace Motronic Engine Control Module (ECM) -J220-.
With Generic Scan Tool
Checking Signal From Clutch Vacuum Vent Valve Switch
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 Clutch Vacuum Vent Valve Switch -F36- must be 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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Parking brake must be engaged or else daylight 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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Ground (GND) connections between engine and chassis must be OK.