New Beetle L4-1.8L Turbo (AWP) (2003)
Display: Htg. aC.ON/Htg.aC.OFF (alternating):
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Specification: Between 0.0 to 12.0 V fluctuating
If no voltage is present:
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Switch off ignition.
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Remove inner plenum chamber cover, left
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Connect VAG 1598/31 test box to control module wiring harness. Motronic Engine Control Module (ECM) -J220- is not connected by this action.
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Check wiring for open circuit between test box and 4-pin connector according to Electrical Wiring Diagram.
terminal 2 + socket 63:
Wire resistance: Max. 1.5 Ohms
If no wiring malfunction is found:
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Replace Motronic Engine Control Module (ECM) -J220-.
With Generic Scan Tool
Oxygen Sensor Heater For Oxygen Sensors Behind Three Way Catalytic Converter (TWC), Checking
NOTE: When servicing terminals in harness connector of Heated Oxygen Sensor (HO2S), use only goldplated terminals.
Recommended special tools and equipment
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VAG1526 multimeter or VAG1715 multimeter
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VAG1594 connector test kit
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Wiring diagram
Test requirements