Tachometer Inoperative
Using Tech 2 scan tool, monitor PCM to IPC normal mode communication. If there is an incorrect ENGINE SPEED signal, diagnose RPM signal. If ENGINE SPEED signal is okay, replace IPC.
Using Tech 2 scan tool, monitor PCM to IPC normal mode communication. If there is an incorrect ENGINE SPEED signal, diagnose RPM signal. If ENGINE SPEED signal is okay, replace IPC.