Checking Wiring

-- Remove the Motronic Engine Control Module (ECM) -J623-. Refer to the Repair Information.

-- Disconnect the ECT harness connector at the sensor.

-- Using a multimeter, check the signal circuit of the Engine Coolant Temperature (ECT) Sensor -G62 or G83- electrical harness connector terminal 1 to engine ground. Refer to Wiring Diagrams for pin locations.

Specified value: OL or no continuity.

If the specified value was Not obtained:

-- Check the wiring for a short circuit to Ground.

-- 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 the Repair Information.