Knock Sensor (KS)

The KS is a tuned accelerometer on the engine which converts engine vibration to an electrical signal. The PCM uses this signal to determine the presence of engine knock and to retard spark timing.

Fig 1: Identifying Knock Sensor (KS)

Manifold Absolute Pressure (MAP) Sensor The MAP sensor measures intake manifold absolute pressure. The PCM uses information from the MAP sensor to measure how much exhaust gas is introduced into the intake manifold.

Fig 2: Identifying Manifold Absolute Pressure (MAP) Sensor