P0560

1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0560: System Voltage

DTC P0560 - System Voltage

DESCRIPTION

The battery supplies electricity to the ECM even when the ignition switch is in the OFF position. 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 a Techstream. Freeze frame data record 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 FUSE)




(a) Remove the EFI fuse from the engine room relay block.
(b) Check the EFI fuse resistance.
Standard Resistance:
Below 1 Ohms
(c) Reinstall the EFI fuse.
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 resistance according to the value(s) in the table below.
Standard Voltage:






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




(a) Check the harness and the connector between the EFI fuse and ECM.
(1) Remove the EFI fuse from the engine room relay block.
(2) Disconnect the E47 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):






(4) Reconnect the ECM connector.
(5) Reinstall the EFI fuse.
(b) Check the harness and the connector between the EFI fuse and battery.
(1) Remove the EFI fuse from the engine room relay block.
(2) Disconnect the negative battery terminal.
(3) Disconnect the positive battery terminal.
(4) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for open):






Standard Resistance (Check for short):






(5) Reinstall the EFI fuse.
(6) Reconnect the positive battery terminal.
(7) Reconnect the negative battery terminal.
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 RELAY BLOCK