Testing If Display Approx. 140.0°C

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

Fig 1: Identifying Engine Coolant Temperature (ECT) Sensor G62 Electrical Harness Connector

Courtesy of AUDI OF AMERICA, LLC

If indication jumps to approx. -40.0°C:

-- End diagnosis and switch ignition off.

-- Replace the Engine Coolant Temperature (ECT) Sensor - G62-. Refer to appropriate service information.

If indication remains at approx. 140.0°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) -J623-. Refer to appropriate service information.

-- Using a multimeter, check the Engine Coolant Temperature (ECT) Sensor - G62- electrical harness connector terminals to the Motronic Engine Control Module (ECM) -J623- electrical harness connector T60 terminals for an open circuit according to the wiring diagram.

Engine Coolant Temperature (Ect) Sensor - G62- Electrical Harness Connector Terminals	Motronic Engine Control Module (Ecm) -J623- Electrical Connector T60 Terminals Or Test Box Socket
1	14
2	57

Specified Value: 1.5 Ω Max.

If the specification was not obtained:

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

-- 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 wiring:

-- Replace the Motronic Engine Control Module (ECM) -J623-. Refer to appropriate service information.