Jetta Sedan L5-2.5L (CBTA) (2009)
If indication jumps to approx. -40.0 °C:
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Switch ignition off.
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Replace the Engine Coolant Temperature (ECT) Sensor (G62)
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 test box.
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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Disconnect the ECT harness connector at the sensor.
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Using a multimeter, check the signal circuit of the Engine Coolant Temperature (ECT) Sensor (G62) electrical harness connector terminal 1 to
engine ground.
Specified value: OL or no continuity.
If the specification was not obtained:
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Check the wiring for a short circuit to Ground (GND).
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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 wiring:
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Replace the Motronic Engine Control Module (ECM) (J623). Refer to --> [ Motronic Engine Control Module, Replacing ] .
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to --> [ Diagnostic Mode 03 - Read DTC Memory ] See: Testing and Inspection/Scan Tool Testing and
Procedures/Diagnostic Mode 03 - Read DTC Memory.
2. If necessary, erase the DTC memory. Refer to --> [ Diagnostic Mode 04 - Erase DTC Memory ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Diagnostic Mode 04 - Erase DTC Memory.