Jetta GLS L4-1.8L Turbo (AWD) (2001)
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Switch off ignition.
If the specification is not attained:
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Connect test box VAG 1598/31 to control module wiring harness. The engine control module remains disconnected.
Checking voltage supply terminal 30
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Measure supply voltage between test box sockets 1 + 62 using multimeter and adapter cables from VAG 1594:
Specification: at least 11.5 V
If the specification is not attained:
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Check wiring connections to relay plate according to wiring diagram.
Checking voltage supply terminal 15
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Measure supply voltage with multimeter and aux. cables from VAG 1594 between test box sockets 2 and 3:
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Switch on ignition.
Specification: min. 11.5 V
If the specification is not attained:
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Check wiring connections to relay plate according to wiring diagram.
Checking voltage supply via main relay
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Measure voltage supply between sockets 2 + 121 of test box using multimeter and adapter cables from VAG1594 connector test kit:
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Switch on ignition.
Specification: min. 11.5 V
NOTE: Voltage supply is maintained for several minutes even after ignition is switched off.
If the specification is not attained:
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Check wiring connections to relay plate according to wiring diagram.
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Check activation wire from Engine Control Module (ECM) terminal 21 to Motronic Engine Control Module (ECM) power supply relay -J271-
according to wiring diagram.