Dtc P1001 Fuel Sub Tank Solenoid Duty Control Circuit

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
2Tr-Fbe Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FFV RELAY

CHECK HARNESS AND CONNECTOR (FFV RELAY - SOLENOID VALVE ASSEMBLY)

INSPECT SOLENOID VALVE ASSEMBLY (FOR FUEL INJECTION VOLUME CONTROL)

CHECK HARNESS AND CONNECTOR (SOLENOID VALVE ASSEMBLY (FOR INJECTION VOLUME CONTROL) - ECM)

CHECK SUB TANK FUEL PUMP CONTROL CIRCUIT

DTC P1001 Fuel Sub Tank Solenoid Duty Control Circuit


DESCRIPTION

A Flexible Fuel Vehicle (FFV) is a vehicle with an engine that can be used with a high concentration of ethyl alcohol fuel.
This FFV uses a sub tank system, which allows fuel (with a gasoline concentration of 78% or more) to be injected to the fuel delivery spacer from the sub tank when the ambient temperature is low to enhance low-temperature startability.
The fuel volume is controlled by the ECM and varies depending on the duty ratio of the fuel injection volume control solenoid valve assembly.
If the fuel injection volume control solenoid valve assembly is stuck open, the fuel cut solenoid valve assembly will operate and cut the fuel flow based on signals from the ECM, preventing the fuel from being drawn out of the sub tank due to vacuum from the engine.

DTC No.
DTC Detection Condition
Trouble Area
P1001
  1. Both conditions are met (1 trip detection logic):
    1. Target duty ratio of fuel injection volume control solenoid valve is between 5 and 90%.
    2. Difference between target control value and actual control value continues for 2 seconds or more.
  1. Open or short in solenoid valve assembly (for fuel injection volume control) circuit
  2. Solenoid valve assembly (for fuel injection volume control)
  3. FFV relay
  4. ECM

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P1001 Fuel Sub Tank Solenoid Duty Control Circuit


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. 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.
1.INSPECT FFV RELAY


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P1001 Fuel Sub Tank Solenoid Duty Control Circuit

  1. Remove the FFV relay from the engine room relay block.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		Battery voltage is not applied between terminals 1 and 2
    		10 kΩ or higher
    3 - 5
    		Battery voltage is applied between terminals 1 and 2
    		Below 1 Ω

  1. Reinstall the FFV relay.



NG
REPLACE FFV RELAY
OK


2.CHECK HARNESS AND CONNECTOR (FFV RELAY - SOLENOID VALVE ASSEMBLY)

  1. Remove the FFV relay from the engine room relay block.

  1. Disconnect the solenoid valve assembly (for fuel injection volume control) connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    FFV relay terminal (3) - A70-2 (FFV+)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    FFV relay terminal (3) or A70-2 (FFV+) - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the FFV relay.

  1. Reconnect the solenoid valve assembly (for fuel injection volume control) connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (FFV RELAY - SOLENOID VALVE ASSEMBLY)
OK


3.INSPECT SOLENOID VALVE ASSEMBLY (FOR FUEL INJECTION VOLUME CONTROL)

  1. Inspect the solenoid valve assembly (for fuel injection volume control) (HILUX_TGN26 RM0000033XM00CX.html).



NG
REPLACE SOLENOID VALVE ASSEMBLY (FOR FUEL INJECTION VOLUME CONTROL) (HILUX_TGN26 RM0000033XO00CX.html)
OK


4.CHECK HARNESS AND CONNECTOR (SOLENOID VALVE ASSEMBLY (FOR INJECTION VOLUME CONTROL) - ECM)

  1. Disconnect the solenoid valve assembly (for injection volume control) connector.

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A70-1 (FFV-) - G145-18 (DSSV)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A70-1 (FFV-) or G145-18 (DSSV) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the solenoid valve assembly (for injection volume control) connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (SOLENOID VALVE ASSEMBLY (FOR INJECTION VOLUME CONTROL) - ECM)
OK


5.CHECK SUB TANK FUEL PUMP CONTROL CIRCUIT

  1. Check the sub tank fuel pump control circuit (HILUX_TGN26 RM0000033U200GX.html).



NG
REPAIR OR REPLACE SUB TANK FUEL PUMP CONTROL CIRCUIT
OK

REPLACE ECM (HILUX_TGN26 RM000000VW2024X.html)