DESCRIPTION The fuel pump (for low pressure side) circuit consists of the ECM, fuel pump (for low pressure side) and fuel pump control ECU (which operates the fuel pump (for low pressure side)). Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty signal and sent to the fuel pump control ECU. Based on the signal sent from the ECM, the fuel pump control ECU adjusts the fuel pump (for low pressure side) operation speed. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following procedure. PROCEDURE
(a) Remove the fuel pump control ECU. Click here (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
HINT: This procedure checks for an internal short of the fuel pump control ECU when its transistor is stuck on.
(a) Disconnect the fuel pump control ECU connector. (b) Turn the engine switch on (IG). (c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
HINT: Make a note of the measured voltage as it may be used in a following Active Test.
(a) Disconnect the fuel pump control ECU assembly connector. (b) Disconnect the ECM connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Disconnect the K14 fuel pump control ECU connector. (b) Connect the Techstream to the DLC3. (c) Turn the engine switch on (IG). (d) Turn the Techstream on. (e) Enter the following menus: Powertrain / Engine / Active Test / Fuel Pump Single Phase Energization. Powertrain > Engine > Active Test
(f) Operate the fuel pump control ECU using the Active Test function and measure the voltage according to the value(s) in the table below. Standard Voltage:
HINT:
(a) Disconnect the fuel pump control ECU connector. (b) Disconnect the fuel pump (for low pressure side) connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
HINT: Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side). Click here
(a) Disconnect the fuel pump control ECU connector. (b) Connect the Techstream to the DLC3. (c) Turn the engine switch on (IG). (d) Turn the Techstream on. (e) Enter the following menus: Powertrain / Engine / Active Test / Fuel Pump Single Phase Energization. Powertrain > Engine > Active Test
(f) Operate the fuel pump control ECU using the Active Test function and measure the resistance according to the value(s) in the table below. Standard Resistance:
HINT: *: Using the Active Test, duty control of the transistors in the ECM will be performed. Due to the duty control, resistance of the FPC terminal will be unstable during the Active Test. If the resistance is stable before the Active Test and fluctuates while performing the Active Test, it can be determined that the transistor is operating. If the transistor does not operate during the Active Test, the ECM may be malfunctioning.
(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly. (b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Inspect the EFI-MAIN NO. 2 relay. Click here
(a) Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly. (b) Disconnect the ECM connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Remove the EFI-MAIN NO. 1 and EFI-MAIN NO. 2 relays from the No. 1 engine room relay block and No. 1 junction block assembly. (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly. (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly. (b) Disconnect the fuel pump control ECU connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Disconnect the fuel pump control ECU connector. (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Rear Brake Flexible Hose: Installation
INSTALLATION CAUTION / NOTICE / HINT NOTICE: Because the left and right rear flexible hoses are not interchangeable, verify the part number when installing the rear flexible hoses. When reusing the rear flexible hoses, use the identification marks created during removal to install each rear flexible ...