New Beetle L4-1.8L Turbo (AWV) (2005)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Engine Coolant Temperature (ECT) Sensor, Checking
NOTE: Use only gold-plated terminals when servicing terminals in harness connector of sensor.
Recommended special tools and equipment
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V.A.G 1526 multimeter or V.A.G 1715 multimeter
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V.A.G 1594 connector test kit
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Wiring diagram
Test requirements
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The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK.
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Parking brake must be engaged or else day time driving lights will be switched on.
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Ground (GND) connections between engine and chassis must be OK.
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For vehicles with automatic transmission, selector lever must be in -P-.
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Engine must be cold.
Function test
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Connect diagnostic tester. See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/Diagnostic Tester,
Connecting
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Switch ignition on.
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Under address word 33, select "Diagnostic mode 1: Check measured values."
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Select the measuring value "PID 05: Coolant temperature".
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Check specified value of coolant temperature:
If specified value is not obtained:
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Continue test according to the following table:
If specified value is obtained:
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Start engine and let run at idle. The temperature must climb uniformly
NOTE:
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The temperature increases in increments of 1.0 degree C.
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If the engine shows problems in certain temperature ranges and if the temperature does not climb uniformly, the temperature signal is
intermittent and the sensor should be replaced.