Golf GLS L4-2.0L (AEG) (2001)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
With Generic Scan Tool
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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VAG1526 multimeter or VAG1715 multimeter
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VAG1594 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 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
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Switch ignition on.
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Under address word 33, select "Diagnostic mode 1: Checking 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:
Indicated 1): Approx -46.5°C
Cause: Open circuit or short circuit to B+
Refer to: Continuation of test if indication is approx. -46.5°C:
Indicated 1): Approx 141.0°C
Cause: Short circuit or Ground (GND)
Refer to: Continuation of test if indication is approx. 141.0°C:
1) If a temperature is indicated which differs greatly from ambient temperature of sensor, check sensor wires for contact resistance.
If specified value is obtained:
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Start engine and let run at idle. The temperature should climb uniformly