Introduction: Removal & Installation Lexus LS III рестайлинг

REMOVAL AND INSTALLATION OF BATTERY TERMINAL

Note. After disconnecting the negative (-) terminal, it is necessary to perform the initialization of certain systems, (see INITIALIZATION )

Scheme 21

1. Before performing electronic work, disconnect the battery negative (-) terminal cable beforehand to prevent component and wire damage caused by accidental short circuits.
2. When disconnecting the terminal cable, turn the ignition switch and lighting switch OFF and loosen the terminal nut completely. Perform these operations without twisting or prying the terminal. Remove the battery cable from the battery post.
3. Clock settings, radio settings, DTCs and other data are erased when the battery cable is removed. Before removing the battery cable, record any necessary data.

Scheme 22

1. Do not open the cover or case of the ECU unless absolutely necessary. If the IC terminals are touched, the IC may be rendered inoperative by static electricity.
2. To disconnect electronic connectors, pull the connector itself, not the wires.
3. Be careful not to drop electronic components, such as sensors or relays. If they are dropped on a hard surface, they should be replaced.
4. When cleaning the engine with steam, protect the electronic components, air filter and emission-related components from water.
5. Never use an impact wrench to remove or install temperature switches or temperature sensors.
6. When checking the resistance of a wire connector, insert the tester probe carefully to prevent terminals from bending.

CHECK AND REPLACE ECU

Note. The connector should not be disconnected from the ECU. Perform the inspection from the backside of the connector on the wire harness side. When no measuring condition is specified, perform the inspection with the engine stopped and the ignition switch ON. Check that the connectors are fully seated. Check for loose, corroded or broken wires.

Scheme 23

Scheme 24

1. First check the ECU ground circuit. If it is faulty, repair. If it is normal, the ECU could be faulty. Replace the ECU with a normal functioning one and check if the symptoms occur. If the trouble symptoms stop, replace the ECU. Measure the resistance between the ECU ground terminal and body ground. Resistance: Below 1 ohms Disconnect the ECU connector. Check the ground terminals (on the ECU side and wire harness side) for evidence of bending, corrosion or foreign material. Lastly check the contact pressure of the female terminals.