Jetta L4-1.8L Turbo (AWP) (2004)
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Disconnect connector -1- from Intake Air Temperature (IAT) Sensor -G42- -2-.
If indication jumps to approx. -40 degree C:
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End diagnosis and switch ignition off.
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Replace Intake Air Temperature (IAT) Sensor -G42-, item 28
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. See: 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: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
If indication remains at approx. 143 degree 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. See: Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring Test
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Disconnect connector -1- from Intake Air Temperature (IAT) Sensor -G42- -2-.
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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: