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 MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSFUEL PUMP CONTROL CIRCUIT
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) Hybrid
Fuel Pump Control Circuit
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION Fuel Pump Control Circuit
Fuel Pump Control Circuit
DESCRIPTION
The fuel pump is operated by the engine control system according to the vehicle running condition. After the engine control system receives the engine start requirement signal from the HV control system, an NE signal comes in immediately when the engine is cranked by MG1 (basically, the fuel pump can operate while the NE signal is generated).
The engine control system grounds the FC terminal line after receiving NE signal. It causes to energize the coil in the circuit opening relay, and the current flows to the fuel pump.
When the signal to stop the engine comes from the HV control system to the engine control system, or when the fuel cut operation is performed such as decelerating by the engine brake, the fuel pump is stopped.
INSPECTION PROCEDURE
DESCRIPTION
The fuel pump is operated by the engine control system according to the vehicle running condition. After the engine control system receives the engine start requirement signal from the HV control system, an NE signal comes in immediately when the engine is cranked by MG1 (basically, the fuel pump can operate while the NE signal is generated).
The engine control system grounds the FC terminal line after receiving NE signal. It causes to energize the coil in the circuit opening relay, and the current flows to the fuel pump.
When the signal to stop the engine comes from the HV control system to the engine control system, or when the fuel cut operation is performed such as decelerating by the engine brake, the fuel pump is stopped.
Wiring Diagram:
Step 1:
Step 1(continued)-4:
Step 5-6:
Step 7:
INSPECTION PROCEDURE
RENDER: 1.0x
NO RELATED
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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.