Jetta GLS L4-1.8L Turbo (AWD) (2001)
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Measure voltage supply:
When display group 41, display zone 4 displays: Display, Htg.aC.ON:
Specification: 11.0 - 14.5 V
Display, Htg.AC.ON/Htg.AC.OFF (alternating)
Specification: Between 0.0 - 12.0 V fluctuating
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Switch off ignition.
If no voltage is present:
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Connect test box VAG 1598/31 to control module wiring harness. The engine control module remains disconnected.
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Check wiring between test box and 4-pin connector for open circuit using wiring diagram.
Contact 2 and socket 63
Wire resistance: Max. 1.5 ohms
If the specification is obtained:
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Check wiring from contact 1 to fuel pump relay (J17) according to wiring diagram.
Sensor and Control Check
Special tools and equipment
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Scan tool VAG 1551 or vehicle system tester VAG 1552 with cable VAG 1551/3
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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