Golf L4-1.8L Turbo (AWW) (2003)
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Set multimeter to measure voltage and connect to contact 1 (connector to engine control module) and Ground (GND).
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Start engine and run at idling speed.
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Check voltage supply:
Specification: 11.0 to 14.5 V
If no voltage is present:
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Check wiring from contact 1 to fuel pump relay (J17) according to wiring diagram.
If the specification is obtained:
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Connect multimeter using aux. cables from VAG1594 to measure voltage at contacts 1+2 (connector to engine control module).
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Measure voltage supply:
When display group 41, display zone 4 displays
Display, Htg.aC.ON:
Specification: 11.0 to 14.5 V
Display, Htg. aC.ON/Htg.aC.OFF (alternating)
Specification: Between 0.0 to 12.0 V fluctuating
If the specification is not obtained:
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Switch ignition off.