Real-Time Clock Power Circuit
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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
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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 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