P0560

2AZ-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 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 set 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 Techstream. 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 (EFI NO. 1 FUSE)




(a) Remove the EFI No. 1 fuse from the engine room J/B.
(b) Measure the resistance of the EFI No. 1 fuse.
Standard resistance:
Below 1 Ohms
(c) Reinstall the EFI No. 1 fuse.
NG -- REPLACE FUSE (EFI NO. 1 FUSE)
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (ECM - EFI NO. 1 FUSE, EFI NO. 1 FUSE - BATTERY)




(a) Check the harness and the connector between the EFI No. 1 fuse and ECM.
(1) Remove the EFI No. 1 fuse from the engine room J/B.
(2) Disconnect the A24 ECM connector.
(3) Measure the resistance.
Standard resistance (Check for open):






Standard resistance (Check for short):






(4) Reconnect the ECM connector.
(5) Reinstall the EFI No. 1 fuse.
(b) Check the harness and the connector between the EFI No. 1 fuse and battery.
(1) Remove the EFI No. 1 fuse from the engine room J/B.
(2) Disconnect the negative battery terminal.
(3) Disconnect the positive battery terminal.
(4) Measure the resistance.
Standard resistance (Check for open):






Standard resistance (Check for short):






(5) Reconnect the positive battery terminal.
(6) Reconnect the negative battery terminal.
(7) Reinstall the EFI No. 1 fuse.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT BATTERY
(a) Check the battery voltage.
Standard voltage:
12.5 to 12.9 V at 20°C (68°F)
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 Techstream to the DLC3.
(b) Turn the ignition switch to the ON position and turn the tester on.
(c) Clear the DTCs DTC Check / Clear.
(d) Turn the ignition switch off and turn the tester off.
(e) Start the engine and turn the tester on.
(f) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
(g) Read the DTCs.
Result:






B -- CHECK FOR INTERMITTENT PROBLEMS
A -- REPLACE ECM