PINPOINT TEST F : Incorrect Tachometer Indication: Notes

Diagnostic Overview 

Refer to Instrument Panel Cluster (IPC) , Tachometer.

Normal Operation and Fault Conditions 

If the Revolutions Per Minute (RPM) data is missing for 5 seconds or less or if the IPC receives invalid Revolutions Per Minute (RPM) data for 5 seconds or less, the IPC defaults the tachometer to the last setting, based upon the last good message received.

If the IPC does not receive the engine Revolutions Per Minute (RPM) data from the PCM for 5 seconds or less, the IPC defaults the tachometer to the last setting, based upon the last known good Revolutions Per Minute (RPM) message.