DESCRIPTION In order to supply the optimal fuel pressure according to the driving conditions and usage environment, the variable fuel system sends a drive signal from the ECM to the fuel pump control ECU assembly, steplessly performing variable control of the fuel pump (for low pressure side) and receiving feedback about the fuel pressure (for low pressure side) from the fuel pressure sensor (for low pressure side).
MONITOR DESCRIPTION If the fuel pressure (for low pressure side) decreases despite an increase request signal being sent to the fuel pump control ECU by the ECM, the ECM will store this DTC. MONITOR STRATEGY
CONFIRMATION DRIVING PATTERN 
CAUTION / NOTICE / HINT 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 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. PROCEDURE
(a) Check around and beneath the vehicle for fuel leaks, fumes, etc. OK: No fuel leaks present.
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Powertrain / Engine / Trouble Codes. (e) Read the DTCs. Powertrain > Engine > Trouble Codes
HINT: If any DTCs other than P008A00 are output, troubleshoot those DTCs first.
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump Duty Ratio. Powertrain > Engine > Active Test
(e) Check whether the fuel pump operating sound occurs when performing the Active Test on the Techstream. Standard:
(a) Discharge the fuel pressure. HINT: DTCs may be stored during this inspection. Check for DTCs and clear them using the Techstream. (1) Remove the EFI-MAIN NO. 2 fuse from the No. 1 engine room relay block and No. 1 junction block assembly. (2) Start the engine. (3) After the engine has stopped on its own, turn the engine switch off. HINT: If the engine does not stop naturally, perform direct injection by racing the engine to reduce the fuel pressure [Fuel Pressure (High)] and stop the engine. (4) Crank the engine again and make sure that the engine does not start. (5) Install the EFI-MAIN NO. 2 fuse. (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 / Control the Fuel Pump Duty Ratio / Data List / Fuel Pressure (Low). Powertrain > Engine > Active Test
(f) Read the value displayed on the Techstream when the Active Test was performed. Standard:
HINT: Once the fuel pressure becomes high, the fuel pressure will not decrease, even when switched from High to Low. Therefore, make sure that the fuel pressure is low before checking that the fuel pressure changes when switching from Low to High.
(a) Discharge the fuel pressure. HINT: DTCs may be stored during this inspection. Check for DTCs and clear them using the Techstream. (1) Remove the EFI-MAIN NO. 2 fuse from the No. 1 engine room relay block and No. 1 junction block assembly. (2) Start the engine. (3) After the engine has stopped on its own, turn the engine switch off. HINT: If the engine does not stop naturally, perform direct injection by racing the engine to reduce the fuel pressure [Fuel Pressure (High)] and stop the engine. (4) Crank the engine again and make sure that the engine does not start. (5) Install the EFI-MAIN NO. 2 fuse. (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 / Control the Fuel Pump Duty Ratio / Data List / Fuel Pressure (Low). Powertrain > Engine > Active Test
(f) Read the value displayed on the Techstream when the Active Test was performed. Standard:
HINT: Once the fuel pressure becomes high, the fuel pressure will not decrease, even when switched from High to Low. Therefore, make sure that the fuel pressure is low before checking that the fuel pressure changes when switching from Low to High. OK: Actual Low and High values are as shown above.
(a) Install the fuel pressure gauge (for low pressure line of low pressure side). Click here (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 / Control the Fuel Pump Duty Ratio / Data List / Fuel Pressure (Low). Powertrain > Engine > Active Test
(f) Compare the values in the Data List using the Techstream and the fuel pressure gauge when the Active Test was performed. Standard:
HINT: Perform "Inspection After Repair" after replacing the fuel pressure sensor (for low pressure side). Click here
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Clear the DTC. Powertrain > Engine > Clear DTCs(e) Turn the engine switch off and wait for at least 30 seconds.
(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. (b) Enter the following menus: Powertrain / Engine / Utility / All Readiness. Powertrain > Engine > Utility
(c) Input the DTC: P008A00. (d) Check the DTC judgment result.
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Start the engine. (e) Enter the following menus: Powertrain / Engine / Data List / Fuel Pressure (Low). Powertrain > Engine > Data List
(f) Record the Fuel Pressure (Low) value. (g) Turn the engine switch off. (h) Wait for 10 seconds. (i) Turn the engine switch on (IG). (j) Turn the Techstream on. (k) Enter the following menus: Powertrain / Engine / Data List / Fuel Pressure (Low). Powertrain > Engine > Data List
(l) Compare the Fuel Pressure (Low) value recorded with the engine running to the Fuel Pressure (Low) value currently shown on the Techstream.
HINT: Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side). Click here
(a) Install the fuel pressure gauge (for low pressure line of low pressure side). Click here (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 / Control the Fuel Pump Duty Ratio / Data List / Fuel Pressure (Low). Powertrain > Engine > Active Test
(f) Read the values in the Data List using the Techstream and the fuel pressure gauge when the Active Test was performed.
HINT: Perform "Inspection After Repair" after replacing the fuel pressure sensor (for low pressure side). Click here
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Power Seat Switch: Installation
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