Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 319

Real-Time Clock Power Circuit


Overview

Real-Time Clock Power Circuit

CODE REASON EFFECT
Fault Code: 319
PID: P251
SPN: 251
FMI: 2/2
LAMP: Maintenance
SRT: 

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
SMALL | MEDIUM | LARGE

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 backup module (if equipped).

Component Location

The real-time clock battery backup module is secured to the wiring harness in the vicinity of the ECM.

Shop Talk

This fault indicates that the real-time clock in the ECM lost power. Possible causes for this fault:

  • A weak or failed battery backup module
  • Failed wiring or connectors between the battery backup module and ECM
  • The engine is not equipped with a battery backup module, and lost vehicle battery power to the ECM.

Refer to Troubleshooting Fault Code t05-319.

Last Modified:  26-Oct-2010