SFI System

1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0560: System Voltage
P0560 - System Voltage

DESCRIPTION

The battery supplies electricity to the ECM even when the engine switch is off. This power allows the ECM to store data such as DTC history, freeze frame data and fuel trim values. If the battery voltage falls below a minimum level, the stored ECM data is cleared and the ECM determines that there is a malfunction in the power supply circuit. When the engine is next started, the ECM will illuminate the MIL and sets the DTC.





HINT
If DTC P0560 is set, the ECM does not store other DTCs.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the engine switch on (IG) and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Reading and Clearing Diagnostic Trouble Codes.

4. Turn the engine switch off and wait for at least 30 seconds.

5. Turn the engine switch on (IG) and turn the Techstream on [A].

6. Wait 5 seconds or more.

7. Enter the following menus: Powertrain / Engine / Trouble Codes.

8. Read the DTCs [B].

HINT
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.

9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

10. Input the DTC: P0560.

11. Check the DTC judgment result.





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

12. If the test result is INCOMPLETE or N/A 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





INSPECTION PROCEDURE

HINT
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1. CHECK FUSE (EFI MAIN)

(a) Remove the EFI MAIN fuse from the engine room No. 2 relay block.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.

2. INSPECT ECM (BATT VOLTAGE)

(a) Measure the voltage according to the value(s) in the table below.





Standard voltage:





OK -- REPLACE ECM Removal
NG -- Continue to next step.

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

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





(1) Remove the EFI MAIN fuse from the engine room No. 2 relay block.

(2) Disconnect the A14 ECM connector.

(3) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





Standard resistance (Check for short):





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

(1) Remove the EFI MAIN fuse from the engine room No. 2 relay block.

(2) Disconnect the positive battery terminal Service Precautions.

(3) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





Standard resistance (Check for short):





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 is not depleted.

NG -- REPLACE BATTERY

OK -- CHECK AND REPLACE ENGINE ROOM NO. 2 RELAY BLOCK