Jetta L4-1.8L Turbo (AWD) (2000)
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Check wiring between test box and connector for open circuit according to wiring diagram.
Contact 1 + socket 108
Contact 3 + socket 98
Contact 4 + socket 101
Wire resistance: Max. 1.5 ohms
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Additionally check wires for short to one another.
If no wiring fault is detected and voltage was present between contacts 1+3:
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Checking the functions
If no wiring fault is detected and no voltage was present between contacts 1+3:
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Replace engine control module.
Checking function
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Connect the test box V.A.G 1593/31 to engine control module wiring harness and to engine control module.
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Reconnect connector to charge air pressure sensor (G31).
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Connect multimeter to measure voltage to sockets 101 (positive) and 108 (Ground) using adapter cables from V.A.G 1594.
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Start engine and measure the basic voltage. Specification: 1.80 to 2.00 V
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Raise engine revs by pressing accelerator to Specification: 2.00 to 3.00 V
If the specifications are not attained:
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Replace charge air pressure sensor (G31).
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Check DTC memory.
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Read out readiness code.
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If the DTC memory has been erased or the engine control module separated from the permanent positive, the readiness code must be generated
again.