Jetta L4-2.0L (AEG) (2000)
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Check wires between test box and 5-pin connector for open circuit according to wiring diagram.
Terminal 1 + socket 26
Terminal 3 + socket 27
Wire resistance: max: 1.5 Ohms
Continuation for all vehicles
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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-, terminals 1 (signal) and 3 (Ground -GND-).
Range A displays resistance values for the temperature range of 0 ... 0.50°C, range B displays resistance values for the temperature range of 50 ...
0.100°C.
Read-out examples:
30°C is in range A and corresponds to a resistance of 1.5 to 2.0 kOhms
80°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 Mass Air Flow (MAF) Sensor -G70-, item 3.
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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