Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2006RX 400H AWD V6-3.3L (3MZ-FE) HYBRIDREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTFUEL DELIVERY AND AIR INDUCTIONFUEL PUMPTESTING AND INSPECTIONFUEL SYSTEM
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) Hybrid
Fuel System
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION Fuel System
ON-VEHICLE INSPECTION
1. CHECK FUEL PUMP OPERATION AND FUEL LEAKS
a. When using the intelligent tester:
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to the ON position and turn the intelligent tester on.
NOTE: Do not start the engine.
3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST.
4. Perform the ACTIVE TEST by referring to the given.
5. Turn the fuel pump (C/OPN relay) on.
b. Check that there are no fuel leaks anywhere on the fuel system after performing maintenance.
2. CHECK FUEL PRESSURE
a. Discharge fuel system pressure.
b. Using a voltmeter, measure the battery voltage.
Standard voltage: 12 to 14 V
c. Disconnect the negative (-) terminal cable from the battery.
d. Remove the fuel pipe clamp No.1 from the fuel tube connector.
e. Disconnect the fuel hose from the fuel main tube.
f. Install SST (pressure gauge and fuel tube connector) as shown in the illustration.
SST 09268-45014 (09268-41200,09268-41220, 09268-41250), 09268-41048 (90467-13001, 95336-08070, 09268-41500)
g. Wipe off any splattered gasoline.
h. Reconnect the negative (-) terminal cable to the battery.
i. Connect the intelligent tester to the DLC3 (see step 1 in check fuel pump operation).
j. Measure the fuel pressure.
Fuel pressure: 304 to 343 kPa (3.1 to 3.5 kgf/sq.cm, 44.1 to 49.7 psi)
If pressure is higher than the specified range, replace the fuel pressure regulator.
If pressure is lower than the specified range, check the fuel hoses, fuel hose connections, fuel pump and fuel pressure regulator.
k. Put the vehicle in the "inspection mode".
l. Start the engine.
m. Measure the fuel pressure at idle.
Fuel pressure: 304 to 343 kPa (3.1 to 3.5 kgf/sq.cm, 44.1 to 49.7 psi)
If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.
n. Stop the engine.
o. Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.
Fuel pressure: 147 kPa (1.5 kgf/sq.cm, 21 psi) or more
If pressure is not as specified, check the fuel pump, pressure regulator and injectors.
p. After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing.
q. Reconnect the fuel tube to the fuel main tube.
r. Install the fuel pipe clamp No.1 to the fuel tube connector.
s. Check for fuel leaks (step 1).
1. CHECK FUEL PUMP OPERATION AND FUEL LEAKS
a. When using the intelligent tester:
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to the ON position and turn the intelligent tester on.
NOTE: Do not start the engine.
3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST.
4. Perform the ACTIVE TEST by referring to the given.
5. Turn the fuel pump (C/OPN relay) on.
b. Check that there are no fuel leaks anywhere on the fuel system after performing maintenance.
2. CHECK FUEL PRESSURE
a. Discharge fuel system pressure.
b. Using a voltmeter, measure the battery voltage.
Standard voltage: 12 to 14 V
c. Disconnect the negative (-) terminal cable from the battery.
d. Remove the fuel pipe clamp No.1 from the fuel tube connector.
e. Disconnect the fuel hose from the fuel main tube.
f. Install SST (pressure gauge and fuel tube connector) as shown in the illustration.
SST 09268-45014 (09268-41200,09268-41220, 09268-41250), 09268-41048 (90467-13001, 95336-08070, 09268-41500)
g. Wipe off any splattered gasoline.
h. Reconnect the negative (-) terminal cable to the battery.
i. Connect the intelligent tester to the DLC3 (see step 1 in check fuel pump operation).
j. Measure the fuel pressure.
Fuel pressure: 304 to 343 kPa (3.1 to 3.5 kgf/sq.cm, 44.1 to 49.7 psi)
If pressure is higher than the specified range, replace the fuel pressure regulator.
If pressure is lower than the specified range, check the fuel hoses, fuel hose connections, fuel pump and fuel pressure regulator.
k. Put the vehicle in the "inspection mode".
l. Start the engine.
m. Measure the fuel pressure at idle.
Fuel pressure: 304 to 343 kPa (3.1 to 3.5 kgf/sq.cm, 44.1 to 49.7 psi)
If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.
n. Stop the engine.
o. Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.
Fuel pressure: 147 kPa (1.5 kgf/sq.cm, 21 psi) or more
If pressure is not as specified, check the fuel pump, pressure regulator and injectors.
p. After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing.
q. Reconnect the fuel tube to the fuel main tube.
r. Install the fuel pipe clamp No.1 to the fuel tube connector.
s. Check for fuel leaks (step 1).
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.