Lexus RX400H Service Repair Manual includes detailed information on how to diagnose and repair vehicle components and assemblies. Engine 3.3 L 3MZ-FE V6. Transmission: 5-speed U151E/F CVT. Particular attention is paid to the repair of the Lexus rx400 engine, gearbox, cooling system, heating, ventilation and air conditioning, transmission, brake system, steering, suspension, brake system, body, electrical equipment., as well as characteristics
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When performing service work, it is imperative to disconnect the high-voltage battery by pulling out a special pin under the rear seat.
The high-voltage wires of the hybrid installation are hidden in an orange-colored braid to warn of danger.
The hybrid RX 400h has three engines for four wheels at once - a gasoline engine and two electric motors.
The engine is the main difference between the RX 400h and conventional RX SUV. The RX 400h uses a proprietary Hybrid Synergy Drive setup that combines three motors and a transmission. The main unit is a 3.3-liter gasoline engine borrowed from the RX 330 with a capacity of 214 hp. With. Paired with it are two electric motors: the first (with a capacity of 167 hp and a torque of 330 Nm) rotates the front wheels, the second (68 hp and 130 Nm) rotates the rear. The total power of the power plant declared by the manufacturer is 272 hp. With.
The rear electric motor works according to an individual program. Also, 30% of the energy of a gasoline internal combustion engine is “eaten up” by a starter-generator for charging a nickel-metal hydride (traction) battery. The RX 400h has neither a classic starter nor a generator, as, indeed, a gearbox, and the gasoline unit is started from the front electric motor using a starter-generator, which also provides charging of a high-voltage traction battery with a capacity of 6.5 Ah and a total voltage of 288 V.
The role of the gearbox is performed by a planetary mechanism, which, depending on various situations, mechanically (commands are given by the Hybrid Synergy Drive ECU) distributes the torque from the motors to the front wheels. It also has a built-in reduction gear, because the electric motor develops very high speeds (12400 rpm).
Crossover dynamics - 7.6 s to 100, which is even better than the flagship RX 350 (7.8 s)! Moreover, thanks to the “transmission”, accelerations occur smoothly and with a smooth increase in speed, without any jerks and jerks inherent in traditional transmissions.
In terms of cross-country ability, the RX 400h is noticeably inferior to the rest of the RX modifications and is able to pass in a situation that is harmless for an SUV.
Oil also often oozes from under the front cover of the transfer case - this is a factory defect on the RX 400h. To eliminate leaks, you have to remove the gearbox.
Bad fuel can damage the vibration damper coupling. It is installed between the gasoline unit and the "planetary" and serves for a smooth transmission of torque during the connection / deactivation of the gasoline engine.
Experts advise cleaning radiators every 50-60 thousand km: contaminated cells can cause overheating of the gasoline engine, as well as the inverter (DC converter 650 V-288 V-12 V) and disable it. The inverter has a separate cooling circuit.
There are no serious complaints about the 3.3 liter engine either. The variable valve timing system VVTi and individual ignition coils serve without problems. The timing is equipped with a belt, which is changed along with the rollers every 120 thousand km. The nozzles and throttle are cleaned every 40–50 thousand km, and candles with iridium electrode tips last up to 80 thousand km. The fuel filter will last a very long time, but its replacement is laborious - it is necessary to dismantle the tank.