Jetta Wagon L4-1.8L Turbo (AWP) (2005)
If no voltage is present:
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Connect test box VAG 1598/31 to control module wiring harness. Engine control module remains disconnected.
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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 malfunction is detected and voltage was present between terminals 1+3:
If no wiring malfunction is detected and voltage was not present between terminals 1+3:
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Replace engine control module:
Checking function
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Connect test box VAG 1598/31 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 VAG 1594.
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Start engine and measure 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 readiness code.
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Generate readiness code again if DTC memory has been erased or engine control module separated from permanent positive.