3UZ-FE Engine Control System

3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0560: System Voltage
P0560 - System Voltage

MONITOR DESCRIPTION

The battery supplies electricity to the ECM even when the ignition switch is OFF. This electricity allows the ECM to store data such as DTC history, freeze frame data, fuel trim values, and other data. If the battery voltage falls below a minimum level, the memory is cleared and the ECM will conclude that there is a fault in the power supply circuit. At the next engine start, the ECM will illuminate the MIL and set a DTC.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





- Connect the Techstream to the DLC3.

- Turn the ignition switch to ON and turn the Techstream on.

- Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

- Turn the ignition switch off and wait for at least 30 seconds.

- Turn the ignition switch to ON and turn the Techstream on.

- Wait 5 seconds or more [A].

- Enter the following menus: Powertrain / Engine / Trouble Codes [B].

- Read the DTCs.

HINT
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Input the DTC: P0560.

- Check the DTC judgment result.





HINT
If the judgment result shows ABNORMAL, the system has a malfunction.

- If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM





INSEPCTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (BATTERY VOLTAGE)

(a) Connect the Techstream to the DLC3.

(b) Enter the following menus: Powertrain / Engine / Data List / Battery Voltage.

Result:





B -- INSPECT BATTERY
A -- Continue to next step.

2. INSPECT FUSE (EFI)





(a) Remove the EFI fuse from the engine room No. 1 relay block.

(b) Measure the resistance of the fuse.

Standard Resistance:

Below 1 Ohms

NG -- REPLACE FUSE AND FIND CAUSE FOR FUSE BEING BLOWN
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (ECM - EFI FUSE, EFI FUSE - BATTERY)





(a) Check the wire harness between the EFI fuse and ECM.

(1) Remove the EFI fuse from the engine room No. 1 relay block.

(2) Disconnect the E6 ECM connector.

(3) Measure the resistance of the wire harness side connectors.

Standard Resistance:





(b) Check the wire harness between the EFI fuse and battery.

(1) Remove the EFI fuse from the engine room No. 1 relay block.

(2) Disconnect the cable from the battery positive (+) terminal.

(3) Measure the resistance of the wire harness side connectors.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. INSPECT BATTERY

(a) Check that the battery is not depleted.

OK:

Battery voltage is 11 V or more.

NG -- REPLACE BATTERY

OK -- CHECK FOR INTERMITTENT PROBLEMS