Jetta Wagon L4-1.8L Turbo (AWP) (2005)
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Set multimeter to measure voltage and connect to contact 3 (connector to engine control module) and Ground (GND).
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Start engine and run at idling speed.
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Measure voltage supply:
Specification: 11.0 to 14.5 V
If the specification is not obtained:
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Check wiring from contact 3 to fuel pump (FP) relay -J17- using wiring diagram.
If the specification is obtained:
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Connect multimeter using auxiliary cables from V.A.G1594 to measure voltage at contacts 3 and 4 (connector to engine control module).
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Check activation by engine control module while observing display group 41, display zone 2.
Display Htg.bC.ON
Specification: 11.5 to 14.5 V
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Display Htg.bC.ON/Htg.bC.OFF (alternating)
Specification: between 0.0 to 12.0 V fluctuating
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Switch ignition off.
If the specification is not obtained:
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Connect V.A.G1598/31 test box to control module wiring harness. Engine control module remains disconnected.
