Brand:

Toyota

Model Name:

Yaris NCP90 91 92 93

Manual:

Repair Manual

Section:

1Nz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Check fuse (efi fuse)

  5. Check harness and connector (ecm - efi fuse, efi fuse - battery)

  6. Inspect battery

  7. Check battery terminal

  8. Check whether dtc output recurs (dtc p0560)

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 will illuminate the MIL and sets the DTC.

DTC No.
DTC Detection Conditions
Trouble Areas
P0560
Open in ECM back-up power source circuit
(1 trip detection logic)
  1. Open in back-up power source circuit
  2. Battery
  3. Battery terminals
  4. EFI fuse
  5. ECM
HINT:
If DTC P0560 is set, the ECM does not store other DTCs or the data stored in the ECM are partly erased.

WIRING DIAGRAM


Remove the EFI fuse from the engine room relay block. Yaris


INSPECTION PROCEDURE

HINT:
Read freeze frame data using an 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)
Remove the EFI fuse from the engine room relay block. Yaris

  1. Remove the EFI fuse from the engine room relay block.

  1. Check the EFI fuse resistance.

    Standard resistance:
    Below 1 Ω

  1. Reinstall the EFI fuse.



NGnext
CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK
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2.CHECK HARNESS AND CONNECTOR (ECM - EFI FUSE, EFI FUSE - BATTERY)
Check the harness and the connector between the EFI fuse and ECM.Remove the EFI fuse from the engine room relay block.Disconnect the A21 ECM connector.Check the resistance.Standard resistance (Check for open):Tester ConnectionsSpecified ConditionsEFI fuse (2) - BATT (A21-20)Below 1 ΩStandard resistance (Check for short):Tester ConnectionsSpecified ConditionsEFI fuse (2) or BATT (A21-20) - Body ground10 kΩ or higherReconnect the ECM connector.Reinstall the EFI fuse. Yaris

  1. 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 A21 ECM connector.

    3. Check the resistance.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      EFI fuse (2) - BATT (A21-20)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connections
      		Specified Conditions
      EFI fuse (2) or BATT (A21-20) - 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 relay block.

    2. Disconnect the positive battery terminal.

    3. Check the resistance.

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

    4. Reconnect the positive battery terminal.

    5. Reinstall the EFI fuse.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
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3.INSPECT BATTERY

  1. Check that the battery is not depleted.

OK:
Battery is not depleted.


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REPLACE BATTERY
OK
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4.CHECK BATTERY TERMINAL

  1. Check that the battery terminals are not loose or corroded.

    OK:
    Battery terminals are not loose or corroded


NGnext
REPAIR OR REPLACE BATTERY TERMINAL
OK
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5.CHECK WHETHER DTC OUTPUT RECURS (DTC P0560)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Clear DTCs (Click here).

  1. Turn the ignition switch off and turn the tester off.

  1. Start the engine and turn the tester on.

  1. Select the following menu items: Powertrain / Engine and ECT/ DTC.

  1. Read DTCs.

    Result:
    Display (DTC Output)
    		Proceed To
    P0560
    		A
    No output
    		B


Bnext
CHECK FOR INTERMITTENT PROBLEMS (Click here)
A
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REPLACE ECM (Click here)