Dtc P0560 System Voltage

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Gr-Fe Engine Control System. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FUSE (EFI FUSE)

INSPECT ECM (BATT VOLTAGE)

CHECK HARNESS AND CONNECTOR (ECM - EFI FUSE, EFI FUSE - BATTERY)

INSPECT BATTERY

DTC P0560 System Voltage


DESCRIPTION

The battery supplies electricity to the ECM even when the engine 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 will illuminate the MIL and sets the DTC.

DTC No.
DTC Detection Condition
Trouble Area
P0560
Open in ECM back-up power source circuit
(1 trip detection logic)
  1. Open in back-up power source circuit
  2. EFI fuse
  3. ECM
HINT:
If DTC P0560 is set, the ECM does not store other DTCs.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System. Dtc P0560 System Voltage


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.
1.CHECK FUSE (EFI FUSE)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System. Dtc P0560 System Voltage

  1. Remove the EFI fuse from the engine room No. 2 junction block.

  1. Measure the resistance.

    Standard resistance:
    Below 1 Ω

  1. Reinstall the EFI fuse.



NG
CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE
OK


2.INSPECT ECM (BATT VOLTAGE)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System. Dtc P0560 System Voltage

  1. Measure the voltage between the terminals of the A6 and E7 ECM connectors.

    Standard voltage:
    Tester Connection
    		Specified Condition
    BATT (A6-4) - E1 (E7-7)
    		9 to 14 V


NG
Go to step 3
OK

REPLACE ECM

3.CHECK HARNESS AND CONNECTOR (ECM - EFI FUSE, EFI FUSE - BATTERY)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System. Dtc P0560 System Voltage

  1. Check the harness and the connector between the EFI fuse and ECM.

    1. Remove the EFI fuse from the engine room No. 2 junction block.

    2. Disconnect the A6 ECM connector.

    3. Measure the resistance.

      Standard resistance (Check for open):
      Tester Connection
      		Specified Condition
      EFI fuse (2) - BATT (A6-4)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connection
      		Specified Condition
      EFI fuse (2) or BATT (A6-4) - Body ground
      		10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reinstall the EFI fuse.

  1. Check the harness and the connector between the EFI fuse and battery.

    1. Remove the EFI fuse from the engine room No. 2 Junction Block.

    2. Disconnect the positive battery terminal.

    3. Measure the resistance.

      Standard resistance (Check for open):
      Tester Connection
      		Specified Condition
      Battery positive terminal - EFI fuse (1)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connection
      		Specified Condition
      Battery positive terminal or EFI fuse (1) - Body ground
      		10 kΩ or higher

    4. Reconnect the positive battery terminal.

    5. Reinstall the EFI fuse.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT BATTERY

  1. Check that the battery is not depleted.



NG
REPLACE BATTERY
OK

CHECK AND REPLACE ENGINE ROOM No. 2 JUNCTION BLOCK