New Beetle GLS L4-2.0L (AVH) (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
VAG 1526 multimeter or VAG 1715 multimeter
VAG 1594 connector test kit
The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK.
Parking brake must be engaged or else daylight driving lights will be switched on.
For vehicles with automatic transmission, selector lever must be in position -P- or -N-.
Engine must be cold.
Function test, Vehicles with engine code AVH, AZG, BDC
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
Switch ignition on.
Under address word 33, select "Diagnostic mode 1: Checking measured values."
Select the measuring value "PID 05: Coolant temperature".
Check specified value of coolant temperature:
If specified value is not obtained:
Continue test according to the following table:
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:
Start engine and let run at idle. The temperature must climb uniformly
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.