Monitor Description
The battery supplies power to the ECM even when the ignition switch is OFF. This power allows the ECM to record data such as DTC history, freeze frame data, and F/B learning values. When the battery voltage falls below the minimum level, memory becomes cleared, and the ECM judges it as a power supply circuit malfunction. When the engine is started subsequently, the ECM turns on the MIL and records the DTC.
| DTC No. | DTC detection conditions | Suspected parts |
|---|---|---|
| P0560 | While the engine is running, the terminal voltage of the backup power supply is 3.5 V or less for 2.5 seconds or more. (1 trips detection logic) |
|
NOTE:
If DTC P0560 is recorded, the ECM does not record other DTCs, or the data recorded in the ECM becomes partially cleared.
MONITOR STRATEGY
| Related DTCs | P0560: Back-up power supply for memory of ECM functional check |
| Required Sensors/Components (Main) | ECM |
| Required Sensors/Components (Related) | - |
| Frequency of Operation | Continuous |
| Duration | 2.5 seconds |
| MIL Operation | Immediately after |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
| Overlap prohibited DTC | None |
| Engine Speed | 500 RPM or more |
| Battery Voltage | 10.9V or more |
TYPICAL MALFUNCTION THRESHOLDS
| Voltage of back-up power supply | 3.5V or less |