Engine Control System

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

DTC P0560 - System Voltage

DESCRIPTION

The battery supplies electricity to the ECM (included in hybrid vehicle control ECU) even when the power 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 memory is cleared and the ECM determines that there is a malfunction in the power supply circuit. When the engine is next started, the ECM illuminates the MIL and sets the DTC.





HINT: If DTC P0560 is set, the ECM does not store other DTCs or the data stored in the ECM are partly erased.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT: Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 (IGCT FUSE)





(a) Remove the IGCT fuse from the engine room R/B and J/B.
(b) Measure the resistance of the IGCT fuse.
Standard resistance:
Below 1 Ohms
(c) Reinstall the IGCT fuse.
NG -- CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - IGCT FUSE, IGCT FUSE - BATTERY)





(a) Check the harness and the connector between the IGCT fuse and hybrid vehicle control ECU.
(1) Remove the IGCT fuse from the engine room R/B and J/B.
(2) Disconnect the A61 hybrid vehicle control ECU connector.
(3) Measure the resistance.

Standard resistance (Check for open):





Standard resistance (Check for short):





(4) Reconnect the hybrid vehicle control ECU connector.
(5) Reinstall the IGCT fuse.
(b) Check the harness and the connector between the IGCT fuse and battery.
(1) Remove the IGCT fuse from the engine room R/B and J/B.
(2) Disconnect the positive battery terminal.
(3) Measure the resistance.

Standard resistance (Check for open):





Standard resistance (Check for short):





(4) Reconnect the positive battery terminal.
(5) Reinstall the IGCT fuse.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT BATTERY
(a) Check that the battery is not depleted.
OK:
Battery is not depleted
NG -- REPLACE BATTERY
OK -- Continue to next step.
4. 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.
5. CHECK WHETHER DTC OUTPUT RECURS
(a) Connect the intelligent tester to the DLC3.
(b) Turn the power switch on (IG) and turn the tester on.
(c) Clear the DTCs DTC Check / Clear.
(d) Turn the power switch off and turn the tester off.
(e) Put the engine in inspection mode Component Tests and General Diagnostics.
(f) Turn the tester on.
(g) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
(h) Read the DTCs.

Result:





B -- CHECK FOR INTERMITTENT PROBLEMS
A -- REPLACE HYBRID VEHICLE CONTROL ECU