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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. The ECM is located on the fuel pump side of the engine either above the air compressor (high-mount) or above the starter (low-mount).
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
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