Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLKSWAGEN2002GOLF GLS, 2.0 K, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 11 (1.9L - DIESEL FUEL INJECTION - TDI, ALH, BEW (GENERIC SCAN TOOL) (A4 PLATFORM))DIESEL FUEL INJECTIONCOMPONENTS AND FUNCTIONS, CHECKINGENGINE COOLANT TEMPERATURE (ECT) SENSOR, CHECKINGFUNCTION TEST
2002 Volkswagen Golf GLS, 2.0 K, Standard
Function test
2002 Volkswagen Golf GLS, 2.0 K, StandardSECTION Function test
WARNING: This page is about a different variant/trim than selected.
- Connect diagnostic tester; see DIAGNOSTIC TESTER, CONNECTING .
- Switch ignition on.
- Under address word 33, select "Diagnostic mode 1: Check measured values."
- Select the measuring value "PID 05: Coolant temperature".
- Check specified value of coolant temperature:
ECT SENSOR SPECIFIED VALUE
| PID | Diagnostic text | Specified value: |
|---|---|---|
| 05: | Coolant temperature | approx. coolant temperature |
If specified value is not obtained:
- End diagnosis and switch ignition off.
- Check wires according to wiring diagram, see CHECKING WIRING .
If specified value is obtained:
- Start engine and let run at idle.
- Check specified value of coolant temperature at idle:
ECT SENSOR SPECIFIED VALUE
| PID | Diagnostic text | Specified value: |
|---|---|---|
| 05: | Coolant temperature | Temperature value must increase uniformly |
NOTE:
- The temperature increases in increments of 1.0 °C.
- If the engine indicates problems in certain temperature ranges and if the temperature does not climb uniformly, the temperature signal is intermittent and the sensor must be replaced.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.