Knock Sensor Test
- Connect Test Lamp (US 1115 ) to battery positive terminal and to terminal 1 (single connector with Blue wire). See Fig 1. Test lamp Light Emitting Diode (LED) must light up.
- Start and accelerator engine to over 3000 RPM (1 time only). Test lamp LED must go off. If LED goes out, knock sensor test is completed.
- If LED does not go out, connect a jumper wire between terminal 1 and ground for a minimum of 3 seconds. Test lamp LED must start blinking. If lamp blinks in intervals of 2, the knock sensor circuit is defective.
- Check knock sensor tightness. If loose, tighten knock sensor to 96 INCH lbs. (11 Nm). Check for open circuit in knock sensor wiring. If wiring is okay, knock sensor and/or control unit is defective.