Checking Activation

-- Remove the Engine Control Module - J623 -. Refer to appropriate service information.

-- Using a Multimeter, Check the Engine Speed Sensor -G28- electrical harness connector to the Engine Control Module - J623 - electrical harness connector T60 for an open circuit.

Specified value: 1.5 Ω Max.

If the specified value was Not obtained:

-- Check the wiring connection for an open circuit, short circuit to Battery positive or Ground

-- Check the wiring connection for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection.

-- Go to Final Procedures 

If the specified value was obtained:

-- Remove the Engine Speed Sensor -G28- and Check the sensor wheel for proper seating, damage and run out. Refer to the Repair Information.

If the sensor wheel is OK:

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