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New Beetle L4-2.0L (AZG) (2003)

Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Testing and Inspection > With Manufacturer's Scan Tool > Page 869

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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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VAG 1526 multimeter or VAG 1715 multimeter

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VAG 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 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 AVH, AZG, BDC

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Connect diagnostic tester.  See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Diagnostic Tester, Connecting

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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:

Indicated1)

Cause

approx.. - 40.0 degree C

Open circuit or short circuit to B+

approx.. 140.0 degrees C

Short circuit to Ground (GND)

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 must climb uniformly

NOTE:

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The temperature increases in increments of 1.0 degrees C.

-

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.

Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Testing and Inspection > With Manufacturer's Scan Tool > Page 869

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