Engine Control System - SFI System

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

DTC P0560 - System Voltage

DESCRIPTION

The battery supplies electricity to the ECM even when the engine 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 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 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 Freeze Frame Data.

PROCEDURE

1. INSPECT FUSE (EFI NO. 1)




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




(a) Check the harness and connector between the EFI No. 1 fuse and ECM.
(1) Remove the EFI No. 1 fuse from the engine room R/B.
(2) Disconnect the A10 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) Reinstall the ECM connector.
(b) Check the harness and the connector between the EFI No. 1 fuse and battery.
(1) Disconnect the negative battery terminal.
(2) Disconnect the positive battery terminal.
(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 positive battery terminal.
(5) Reconnect the negative battery terminal.
(6) Reinstall the EFI No. 1 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 Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTCs DTC Check / Clear.
(e) Turn the Techstream off.
(f) Start the engine and turn the Techstream on.
(g) Select the following menu items: Powertrain / Engine / Trouble Code.
(h) Read the DTCs.
Result:






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