ENGINE RPM (Digital)

The engine RPM parameter is displayed by pressing the INFORMATION (digital) button until the ENGINE RPM message is displayed. The IPC contains the engine RPM data via CKT 121 (WHT) from the PCM. The engine speed (RPM) parameter is calculated from the time difference between two consecutive tachometer pulses. This message may be suppressed by using the override option E. The engine RPM parameter displays dashes if a malfunction occurs in the serial data communications from the IPC to the PCM. Diagnose this symptom by retrieving and diagnosing the IPC or PCM serial data communication DTCs.