Code 1-4-3 (Knock Sensor Signal)

Turn ignition off. Remove ignition system ECU. Disconnect ECU connector and remove protective sleeve. Disconnect knock sensor connector and jumper terminals. Measure resistance between terminals No. 12 (Black wire) and No. 13 (Green wire). Resistance should be zero ohms. If resistance is okay, replace knock sensor. If resistance is too high, wiring is faulty.