Jetta L4-2.0L (BEV) (2004)
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
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 daylight driving lights will be switched on.
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For vehicles with automatic transmission, selector lever must be in position -P- or -N-.
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Engine must be cold.
Function test, vehicles with engine code AEG
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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.
Continuation of test if indication is approx. -46.5 degrees C