Beetle L4-1781cc 1.8L Turbo (APH) (1999)
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Check wires between test box and 2-pin connector -1- for open circuit according to wiring diagram.
Terminal 1 + socket 85
Terminal 2 + socket 108
Wire resistance: max. 1.5 ohms
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Also check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: Infinite Ohms
If no malfunctions are found in wire:
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Measure resistance at Intake Air Temperature (IAT) Sensor -G42-.
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Range A displays resistance values for the temperature range of 0...50 degrees C, range B displays resistance values for the temperature range of
50...100 degrees C.
Read-out examples:
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30 degrees C is in range A and corresponds to a resistance of 1.5 to 2.0 k ohms
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80 degrees C is in range B and corresponds to a resistance of 275 to 375 ohms
If specified value is not obtained:
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Replace Intake Air Temperature (IAT) Sensor -G42-:
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Vehicles with engine code AWD, item 28.
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Vehicles with engine code AWP, AWV, item 26.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. See: Powertrain Management/Computers
and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Read Measuring Value Blocks (Function 08)/With Generic Scan
Tool/Diagnostic Mode 4: Reset/Erase Diagnostic Data
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Generate readiness code. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and
Readiness Codes
If no malfunctions are detected in the wires and the resistance values are OK:
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Replace Motronic Engine Control Module (ECM) -J220-.