Operation CHARM: Car repair manuals for everyone.

Tachometer

The IPC displays engine speed based on information from the Powertrain Control Module (PCM). The PCM converts the data from the engine speed sensor to a 2 pulses/engine revolution signal. The IPC uses the engine speed signal circuit 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 exists.