P0560 System Voltage – Toyota/Lexus
Description:
The battery supplies power to the TCM even when the ignition switch is off. This power allows the TCM to store data such as DTC history and freeze frame data. If the battery voltage falls below a minimum level, the TCM data is cleared and the TCM determines that there is a malfunction in the power supply circuit. The next time the engine is started, the TCM will illuminate the MIL and store the DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P0560 | System Voltage | TCM back-up power source circuit is low voltage for 3 seconds or more (1-trip detection logic). | ·Open or short in back-up power source circuit·TCM | Comes on | DTC stored |
WIRING DIAGRAM:
Procedure:
1. Check DTC output.
2. Check TCM (Battery and Ground).
Measure the voltage according to the value(s) in the table below.Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G90-5 (BATT) – C77-1 (E1) | Always | 11 to 14 V |
c.Measure the resistance according to the value(s) in the table below.Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C77-1 (E1) – Body ground | Always | Below 1 Ω |
