Passat L4-1.8L Turbo (AWM) (2004)
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Disconnect connector -1- from Intake Air Temperature (IAT) Sensor -G42- -2-.
If indication jumps to approx. -40 degrees C:
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End diagnosis and switch ignition off.
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Replace Intake Air Temperature (IAT) Sensor -G42-
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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/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 indication remains at approx. 143 degrees C:
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End diagnosis and switch ignition off.
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Check wires according to wiring diagram.
Checking wiring
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Connect test box to control module wiring harness, connect test box for wiring test.
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Disconnect connector -1- from Intake Air Temperature (IAT) Sensor -G42- -2-.
Vehicles with engine code AEB
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Check wires between test box and 2-pin connector for open circuit according to wiring diagram.
Terminal 1 + socket 54
Terminal 2 + socket 67
Wire resistance: max: 1.5 ohms
Vehicles with engine code ATW, AUG, AWM
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Check wires between test box and 2-pin connector for open circuit according to wiring diagram.
Terminal 1 + socket 85
Terminal 2 + socket 108
Wire resistance: max: 1.5 ohms
Continued for all vehicles
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Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: Infinite ohms