LEMON Manuals: Even more car manuals for everyone
Home >> Lincoln >> 2012 >> MKZ Hybrid >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> Information Center - Instrumentation, Message Center, And Warning Chimes >> Diagnosis And Testing >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test F: The Speedometer Is Inoperative >> Normal Operation

Normal Operation

The Instrument Panel Cluster (IPC) receives the Vehicle Speed Sensor (VSS) signal from the PCM (non-hybrid) or from the Transmission Control Module (TCM) (hybrid) over the High Speed Controller Area Network (HS-CAN) communication bus. The PCM or TCM receives the VSS input from the Output Shaft Speed (OSS). The IPC monitors the VSS input from the PCM or TCM and commands the speedometer with a corresponding movement of the pointer.

If the vehicle speed data is missing for 5 seconds or less or if the IPC receives invalid vehicle speed data for 5 seconds or less, the IPC defaults the speedometer to the last setting, based upon the last known good vehicle speed message. If the IPC does not receive the vehicle speed data for more than 5 seconds, the IPC sets DTC U0100:00 (non-hybrid) or U0101:00 (hybrid) in continuous memory and defaults the speedometer to 0 km/h (0 mph). If the vehicle speed data received is deemed invalid by the IPC for 5 seconds or more, the IPC sets DTC U0401:68 (non-hybrid) or U0402:68 and defaults the speedometer to 0 km/h (0 mph).

NOTE: If DTC U0100:00 is set in the IPC, other observable symptoms may be an inoperative tachometer, temperature gauge or odometer.

This pinpoint test is intended to diagnose the following: 

scientia non olet · About LEMON Manuals