Jetta SportWagen L4-20L Turbo (CCTA) Air Flow Meter/Sensor Testing - Page 695
Air Flow Meter/Sensor: Testing and Inspection
IAT In MAF Sensor, Checking
Diagnostic Procedures
IAT in MAF Sensor, Checking
‹› The Mass Air Flow sensor and the Intake Air Temperature sensor are combined as a unit and are serviced as an assembly.
‹› Use only gold-plated terminals when servicing terminals in the electrical harness connector of the MAF / IAT sensor (G70 / G42).
Special tools, testers and auxiliary items required
‹› multimeter.
‹› Wiring diagram.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to --> [ Preliminary Check ] See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Preliminary Check
Start diagnosis
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Connect the scan tool.
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Engine MUST be at room temperature.
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Switch the ignition on.
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Using the scan tool, check the intake air temperature:
If the specified value was obtained:
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Fault may be intermittent. Check for proper connection, damaged wiring or loose terminals.
If the specified value was Not obtained:
Checking internal resistance
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Disconnect the MAF / IAT sensor (G70 / G42) electrical harness connector.
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Using a multimeter, check the MAF / IAT sensor (G70 / G42) terminals 4 to 5 for resistance.