Jetta Sedan L5-2.5L (BGP) (2005)
If any of the specified values was not obtained:
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Replace the Engine Coolant Temperature (ECT) Sensor (on Radiator) (G83).
°Testing if display is approx. - 40.0 C
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Disconnect the Engine Coolant Temperature (ECT) Sensor (on Radiator) (G83) electrical harness connector.
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Using a jumper wire, connect the Engine Coolant Temperature (ECT) Sensor (on Radiator) (G83) electrical harness connector terminals 1 to 2.
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Check the value indicated on the scan tool display.
If the value jumps to approx. 140.0 °C
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End of diagnosis and switch the ignition off.
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Replace the Engine Coolant Temperature (ECT) Sensor (G83).
If indication remains at approx. -40.0 °C:
°Testing if display approx. 140.0 C
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Disconnect the Engine Coolant Temperature (ECT) Sensor (on Radiator) (G83) electrical harness connector.
If indication jumps to approx. -40.0 °C:
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End of diagnosis and switch ignition off.
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Replace the Engine Coolant Temperature (ECT) Sensor (on Radiator) (G83)
If indication remains at approx. 140.0 °C:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
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Install the Adapter Cable (121-pin) (VAG1598/31)24 Removal and Installation.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Engine Control Module (ECM) (J220). Refer to --> [ Engine Control Module, Replacing ] See: Engine Control Module/Service and
Repair/Removal and Replacement/Engine Control Module, Replacing.
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Using a Multimeter, check the Engine Coolant Temperature (ECT) Sensor (on Radiator) (G83) electrical harness connector terminals to the
Engine Control Module (ECM) (J220) electrical harness connector T121 terminals for resistance.