On-Vehicle Inspection [12/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUEL PUMP OPERATION AND INSPECT FOR FUEL LEAK

Check fuel pump operation.

NOTE:

Do not start the engine.

Powertrain > Engine > Active Test

Tester Display
Activate the Circuit Relay (Brushless)

Check for pressure in the fuel tube sub-assembly from the fuel line. Check that sounds of fuel flowing from the fuel tank sub-assembly can be heard. If no sounds can be heard, check the relay, fuel pump, ECM and wiring connectors.

Inspect for fuel leaks.
1. Check that there are no fuel leaks from the fuel system after doing any maintenance or repairs. If there is a fuel leak, repair or replace parts as necessary.

CHECK FUEL PRESSURE

Pre-procedure1

Discharge fuel system pressure.
HINT:

Refer to PRECAUTION [12/2023 - ]

Measure the auxiliary battery voltage.

Standard Voltage

Tester Connection	Condition	Specified Condition
Positive (+) auxiliary battery terminal - Negative (-) auxiliary battery terminal	20°C (68°F)	11 to 14 V

Disconnect the cable from the negative (-) auxiliary battery terminal.
HINT:

Refer to REMOVAL [12/2023 - ]

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Remove the No. 2 fuel pipe clamp from the fuel tube connector.

for Port Injection Side:

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the No. 1 fuel hose from the fuel pipe.
HINT:

Refer to PRECAUTION [12/2023 - ]

for Direct Injection Side:

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the No. 1 fuel hose from the fuel pipe.
HINT:

Refer to PRECAUTION [12/2023 - ]

Install SST (EFI fuel pressure gauge) as shown in the illustration.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Fuel Tube Sub-assembly (Vehicle Side)
*a	SST (Hose Band)
*b	SST (T Joint)
*c	SST (Gauge)
*d	SST (Hose Joint)
*e	SST (Hose)
*f	SST (Fuel Tube Connector)
*g	Fuel Pipe (Vehicle Side)

SST: 09268-45101
1. 09268-41250
2. 09268-41260
3. 09268-41280
4. 09268-41500
5. 09268-41700
6. 95336-08070

Wipe up any spilled fuel.
Connect the cable to the negative (-) auxiliary battery terminal.
HINT:

Refer to INSTALLATION [12/2023 - ]

Measure the fuel pressure.

NOTE:

Do not start the engine.

Powertrain > Engine > Active Test

Tester Display
Activate the Circuit Relay (Brushless)

Standard Fuel Pressure

Specified Condition
196 to 588 kPa 2.0 to 6.0 kgf/cm² 28 to 85 psi

If the fuel pressure is more than the standard, replace the fuel main valve assembly.
If the fuel pressure is less than the standard, check the fuel hoses and their connections, fuel pump, fuel filter (fuel suction plate sub-assembly) and fuel main valve assembly.

Pre-procedure2

Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

Start the engine.

Measure the fuel pressure at idle.

Standard Fuel Pressure

Specified Condition
196 to 588 kPa 2.0 to 6.0 kgf/cm² 28 to 85 psi

HINT:

Refer to Standard Idle Speed.

Refer to PROCEDURE - Step 9

Pre-procedure3

Disconnect the GTS from the DLC3.
Stop the engine.

Check that the fuel pressure remains as specified for 5 minutes.

Standard Fuel Pressure

Specified Condition
98 kPa or higher 1.0 kgf/cm² or higher 14 psi or higher

If the result is not as specified, check the fuel pump, fuel main valve assembly and/or port fuel injector assemblies.

Post-procedure1

After checking the fuel pressure, disconnect the cable from the negative (-) auxiliary battery terminal and carefully remove SST to prevent fuel from spraying.
HINT:

Refer to REMOVAL [12/2023 - ]
for Port Injection Side:
1. Connect the No. 1 fuel hose to the fuel pipe.
  HINT:
  
  Refer to PRECAUTION [12/2023 - ]
for Direct Injection Side:
1. Connect the No. 1 fuel hose to the fuel pipe.
  HINT:
  
  Refer to PRECAUTION [12/2023 - ]
Install the No. 2 fuel pipe clamp to the fuel tube connector.
Connect the cable to the negative (-) auxiliary battery terminal.
HINT:

Refer to INSTALLATION [12/2023 - ]
Inspect for fuel leaks.
HINT:

See step 1

CHECK FUEL PRESSURE (for High Pressure)

Pre-procedure1

Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

According to the display on the GTS, read the Data List.

Powertrain > Engine > Data List

Tester Display
Engine Speed
Fuel Pressure (High)
Injection Mode

HINT:

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, read the Data List after charge control has completed.

Standard

GTS Display	Condition	Specified Condition
Fuel Pressure (High)	Shift position: P A/C: Off Engine warmed up Engine Speed: 2500 RPM Injection Mode: Direct	1800 to 2800 kPa

If the result is not as specified, check the fuel pump, fuel (engine room side) pump assembly, fuel pressure sensor and wire harnesses.

Post-procedure1

None