CM870 and ISX Engines – FAULT CODE 319

Real-Time Clock Power Circuit


Fault Code: 319
PID: P251
SPN: 251
FMI: 2/2
LAMP: Amber (Maintenance)

Real Time Clock – Power Interrupt. Real-time clock lost power.

None on performance. Data in the ECM will not have accurate time and date information.

Real-Time Clock Power Circuit

Circuit Description

Under ordinary operating conditions, the real-time clock in the ECM is powered by the vehicle’s batteries. If battery power to the ECM is lost, then the real-time clock will be powered by a battery in the engine harness
(if equipped).

Component Location

The real-time clock battery is secured to the engine harness near the ECM. Refer to Section E for a detailed component location view.

Shop Talk

This fault indicates that the real-time clock in the ECM lost power. Possible causes for this fault are weak or failed real-time clock battery, failed wiring or connectors between the battery and ECM, or the engine is not equipped with a real-time clock battery and the vehicle battery power to the ECM is lost.

Refer to Troubleshooting Fault Code t05-319

Last Modified:  01-Sep-2010