Lexus ES: On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. CHECK FUEL PUMP OPERATION AND INSPECT FOR FUEL LEAK

(a) Check fuel pump operation.

(1) Connect the Techstream to the DLC3.

(2) Turn the power switch on (IG).

NOTICE:

Do not start the engine.

(3) Turn the Techstream on.

(4) Enter the following menus: Powertrain / Engine / Active Test / Activate the Circuit Relay.

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

(b) 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.

(c) Turn the power switch off.

(d) Disconnect the Techstream from the DLC3.

2. CHECK FUEL PRESSURE

(a) Discharge fuel system pressure.

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(b) Measure the auxiliary battery voltage.

Standard Voltage:

11 to 14 V

(c) Open the cover of the EFI fuel pipe clamp and remove the EFI fuel pipe clamp from the fuel tube connector.

	Open
	Pull

(d) Disconnect the fuel tube sub-assembly from the fuel pipe. Click here

(e) Install SST (EFI fuel pressure gauge) as shown in the illustration. SST: 09268-45101 09268-41250 09268-41260 09268-41280 09268-41500 09268-41700 95336-08070

*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)

(f) Wipe up any spilled fuel.

(g) Connect the cable to the negative (-) auxiliary battery terminal.

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

Click here

(h) Connect the Techstream to the DLC3.

(i) Turn the power switch on (IG).

NOTICE:

Do not start the engine.

(j) Turn the Techstream on.

(k) Enter the following menus: Powertrain / Engine / Active Test / Activate the Circuit Relay.

(l) Measure the fuel pressure.

Standard Fuel Pressure:

294 to 833 kPa (3.0 to 8.5 kgf/cm2, 43 to 121 psi)

(m) Put the engine in Inspection Mode (Maintenance Mode).

(n) Start the engine.

(o) Measure the fuel pressure at idle.

Standard Fuel Pressure:

294 to 833 kPa (3.0 to 8.5 kgf/cm2, 43 to 121 psi)

HINT:

Refer to Standard Idle Speed.

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(p) Stop the engine.

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

Standard Fuel Pressure:

98 kPa (1.0 kgf/cm2, 14.2 psi) or more

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

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

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

Click here

(s) Connect the fuel tube sub-assembly to the fuel pipe.

Click here

(t) Install the EFI fuel pipe clamp to the fuel tube connector and close the cover of the EFI fuel pipe clamp.

(u) Connect the cable to the negative (-) auxiliary battery terminal.

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

Click here

(v) Inspect for fuel leaks.

Click here

3. CHECK FUEL PRESSURE (for High Pressure)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Put the engine in Inspection Mode (Maintenance Mode).

(e) 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.

(f) Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Coolant Temperature, Fuel Pressure (High) and Injection Mode.

(g) According to the display on the Techstream, read the Data List.

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:

If the result is not as specified, check the fuel pump (for Low Pressure), fuel pump assembly (for High Pressure), fuel pressure sensor (for High Pressure) and wire harnesses.

(h) Stop the engine.

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