Tachometer

The IPC displays the engine speed based on information from the PCM. The PCM convents the data from the engine speed sensor to a 2 pulses/engine revolution signal. The IPC uses the engine speed signal circuit (2 pulses/engine revolution) from the PCM in order to calculate the engine speed. The tachometer defaults to 0 RPM if a malfunction in the engine speed signal circuit (2 pulses/engine revolution) exists.