Engine Control: SFI System

2AZ-FXE ENGINE CONTROL: SFI SYSTEM: P0560: System Voltage
P0560 - System Voltage

MONITOR DESCRIPTION

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





HINT
If DTC P0560 is set, the hybrid vehicle control ECU does not store other DTCs or the data stored in the hybrid vehicle control ECU may be partly cleared.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





WIRING DIAGRAM





CONFIRMATION DRIVING PATTERN





- Connect the Techstream to the DLC3.

- Turn the power switch on (IG) and turn the Techstream on.

- Clear the DTCs DTC Check / Clear.

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

- Turn the power switch on (IG) and turn the Techstream on.

- Wait 5 seconds or more [A].

- Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

- Read the DTC [B].

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 and ECT / Utility / All Readiness.

- Input the DTC: P0560.

- Check the DTC judgment result.





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

INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
Read freeze frame data using the Techstream. The hybrid vehicle control ECU records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - IGCT FUSE)

(a) Disconnect the negative battery terminal.

(b) Disconnect the positive battery terminal.

(c) Remove the IGCT fuse from the engine room relay block.

(d) Disconnect the hybrid vehicle control ECU connector.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





(f) Reinstall the IGCT fuse.

(g) Reconnect the hybrid vehicle control ECU connector.

(h) Reconnect the positive battery terminal.

(i) Reconnect the negative battery terminal.

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

2. INSPECT BATTERY

(a) Check that the battery is not discharged or weak.

OK:

Battery is not discharged or weak.

NG -- CHARGE OR REPLACE BATTERY
OK -- Continue to next step.

3. CHECK BATTERY TERMINAL

(a) Check that the battery terminals are not loose or corroded.

OK:

Battery terminals are not loose or corroded.

NG -- REPAIR OR REPLACE BATTERY TERMINAL
OK -- Continue to next step.

4. CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs DTC Check / Clear.

(e) Turn the power switch off and turn the Techstream off.

(f) Turn the power switch on (IG) and turn the Techstream on.

(g) Wait for 5 seconds.

(h) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(i) Read the DTCs.

Result:





B -- CHECK FOR INTERMITTENT PROBLEMS

A -- REPLACE HYBRID VEHICLE CONTROL ECU Removal