SPN 251 - FMI 2 (Fault Code 319)

Real-Time Clock Power Interrupt - Data Erratic, Intermittent or Incorrect

Real-Time Clock Power Circuit

Fault Code: 319
PID(P), SID(S): P251
SPN: 251
FMI: 2/2
Lamp: Amber (Maintenance Flashout)

REASON: Real-Time Clock Power Interrupt - Data Erratic, Intermittent or Incorrect. Real-time clock lost power.

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

Circuit Description:
Under ordinary operating conditions, the real-time clock in the electronic control module (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.

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

If the Real Time Clock is supplied by the OEM via a CAN BUS and a battery backup is not used, then refer to the OEM wiring diagram. If this is the case, then check INSITE™ electronic service tool, “Advanced ECM Data - Real Time Clock Settings.” If the OEM supplies a Real Time Clock signal, then the address must be set according to the OEM wiring or the fault code will become active.

Read More:
SPN 91 - FMI 19 (Fault Code 297)
SPN 1388 - FMI 4 (Fault Code 298)


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