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Passat Sedan V6-3.6L (BLV) (2008)

Sensors and Switches > Sensors and Switches - HVAC > Ambient Temperature Sensor / Switch HVAC > Component Information > Testing and Inspection

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Ambient Temperature Sensor / Switch HVAC: Testing and Inspection

Diagnostic Procedures

Ambient Air Temperature Sensor, Checking

Special tools, testers and auxiliary items required

‹› multimeter.

‹› Wiring diagram.

Test procedure

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Observe safety precautions. Refer to => [ Safety Precautions ] See: Powertrain Management/Computers and Control Systems/Service
Precautions/Safety Precautions

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Observe Clean Working Conditions. Refer to => [ Clean Working Conditions ] See: Powertrain Management/Computers and Control
Systems/Service Precautions/Clean Working Conditions

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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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Turn the ignition switch ON.

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Using the scan tool, check the ambient air temperature:

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Turn the ignition switch OFF.

If the specified value was obtained:

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Fault may be intermittent. Check for proper connection, damaged wiring or loose terminals.

‹› The reading may default to 419 °F if the circuit is open or shorted to ground. The display on the cluster will read 3 dashes.

If the specified value was Not obtained:

Checking internal resistance

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Disconnect the Ambient Air Temperature Sensor (G17) electrical harness connector.

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Using a multimeter, check the Ambient Air Temperature Sensor (G17) terminals 1 to 2 for resistance.

Use the chart below for the specified values:

Specified values:

Sensors and Switches > Sensors and Switches - HVAC > Ambient Temperature Sensor / Switch HVAC > Component Information > Testing and Inspection

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