Jetta Sedan L5-2.5L (CBTA) (2009)
If the manufacturers test box is not being used, perform the following step.
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Remove the Motronic Engine Control Module (ECM) (J623). Refer to --> [ Motronic Engine Control Module, Replacing ] .
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Using a multimeter, check the Engine Coolant Temperature (ECT) Sensor (G62) electrical harness connector terminal 1 to the Motronic Engine
Control Module (ECM) (J623) electrical harness connector T60 terminal 42 for an open circuit or a short to voltage, refer to the wiring diagram.
Specified values: 1.5 ohms Max. and 0 volts disconnected from ECM.
If the specification was not obtained:
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Check the wiring for an open or short circuit to Battery (+).
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is detected in the signal circuit:
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Using a multimeter, check terminal 2 of the ECT sensor to engine ground.
Specified value: 1.5 ohms Max
If the specification was not obtained:
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Check the wiring for an open circuit or high resistance.
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is detected in the ground circuit:
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Replace the Motronic Engine Control Module (ECM) (J623). Refer to --> [ Motronic Engine Control Module, Replacing ] .
°Testing if display approx. 140.0 C
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Disconnect the Engine Coolant Temperature (ECT) Sensor (G62) electrical harness connector.
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Turn the ignition switch ON.