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Real-Time Clock Power Circuit
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Overview
CODE | REASON | EFFECT |
Fault Code: 319 PID: P251 SPN: 251 FMI: 2/2 LAMP: Amber (Maintenance) SRT: |
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
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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