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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 > Technical Service Bulletins > Engine Coolant Temperature (ECT) Sensor - Checking > Page 855

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3.

For vehicles with automatic transmission, selector lever must be in Park position.

4.

Ground connections between engine and chassis must be valid.

5.

Engine must be cold (50°C (122°F) maximum).

6.

Battery must be fully charged and in good condition.

Test Sequence

Note:

While following tests in this Technical Bulletin, always visually inspect terminals of electrical connectors for damage, corrosion and secure fit.
Repair as necessary.

^

Connect VAS 5051/5052 diagnostic tool.

^

Switch ignition ON.

^

Select "Vehicle Self-Diagnosis".

^

Select vehicle system "01 - Engine electronics".

^

Select diagnosis function "011 - Measured values".

Input "4" on keypad to select "Display group 4" or "7" for "Display group 7" (as indicated in above table). See Service.

^

Confirm with "Q" button.

^

Read coolant temperature value in "Field 3" or "Field 4" (as indicated in above table). See Service.

Specification: approx. coolant temperature

If the specification is not obtained:

 Perform check according to table shown.

1) If a temperature is displayed which deviates greatly from the ambient temperature of the sensor; -G62- sensor or its wiring have high resistance or a
short to B+.

While observing the displayed temperature, gently wiggle ECT connector.

Tip:

Refer to component locations in ElsaWeb for location of ECT sensor -G62-.

If display fluctuates by more than 3°:

^

Replace ECT sensor. See ElsaWeb. If sensor was already replaced, repeat wiggle test.

If temperature still fluctuates more than 3°:

^

Replace wiring harness connector terminals.

Continue:

Start engine and run at idle speed. Observe temperature value for uniform consistent increase until 85° C (185°F) is attained.

Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Technical Service Bulletins > Engine Coolant Temperature (ECT) Sensor - Checking > Page 855

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