P0560

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

DTC P0560 - System Voltage

MONITOR DESCRIPTION

The battery supplies electricity to the ECM even when the ignition 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, these memories are 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.

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 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 FUSE (EFI FUSE)





(a) Remove the EFI fuse from the engine room relay block.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1 Ohms
NG -- CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO 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:






NG -- CHECK WIRE HARNESS (ECM - EFI FUSE, EFI FUSE - BATTERY)
OK -- REPLACE ECM
3. CHECK WIRE HARNESS (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 relay block.
(2) Disconnect the E4 ECM connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(b) Check the wire harness between the EFI fuse and battery.
(1) Remove the EFI fuse from the engine room relay block.
(2) Disconnect the cable from the positive (+) battery terminal.
(3) Measure the resistance according to the value(s) in the table below.
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.
NG -- REPLACE BATTERY
OK -- CHECK AND REPLACE ENGINE ROOM RELAY BLOCK