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Home >> Volkswagen >> 2009 >> New Beetle 2D Hatchback, 2.5 F, Standard >> Repair and Diagnosis >> Engine Performance >> System >> 2.5L - Generic Scan Tool - Engine Code(S): BPR & Bps (Hatchback) >> St Generic Scan Tool >> Diagnosis And Testing >> Diagnostic Procedures >> Engine Coolant Temperature Sensor 1, Checking >> Testing if display is approx. - 40.0°C
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Testing if display is approx. - 40.0°C

-- Disconnect the Engine Coolant Temperature (ECT) Sensor -G62 - electrical harness connector.

-- Using a jumper wire, connect the Engine Coolant Temperature (ECT) Sensor - G62- electrical harness connector terminals 3 to 4.

-- Start the engine and let it run at idle.

-- Check the value indicated on the scan tool display.

If the value jumps to approx. 140.0 °C:

-- Switch the ignition OFF.

-- Replace the Engine Coolant Temperature (ECT) Sensor -G62 -.

If indication remains at approx. -40.0 °C:

Checking wiring

If the manufacturers test box is being used, perform the following step.

-- Install the test box.

If the manufacturers test box is not being used, perform the following step.

-- Remove the Motronic Engine Control Module (ECM) -J220-. Refer to the Repair Information.

-- Using a multimeter, check the Engine Coolant Temperature (ECT) Sensor -G62 - electrical harness connector terminals to the Motronic Engine Control Module (ECM) -J220- electrical harness connector for an open circuit or a short to voltage, refer to the chart below.

Engine Coolant Temperature (ECT) Sensor -G62 - electrical harness connector terminals Motronic Engine Control Module (ECM) -J220- electrical connector T121 terminals or test box socket
3 93
4 108

Specified circuit values: 1.5 Ω Max. resistance and 0 volts when disconnected from ECM.

If the specified value was Not obtained:

-- Check the wiring for an open or short circuit to Battery (+).

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the signal circuit:

-- Using a multimeter, check terminal 3 of the ECT sensor to engine ground.

Specified value: 1.5 Ω Max

If the specified value was Not obtained:

-- Check the wiring for an open circuit or high resistance.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the ground circuit:

-- Replace the Motronic Engine Control Module (ECM) -J220-. Refer to the Repair Information.

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