How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2004 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

This ECU is connected to the multiplex communications system. Therefore, be sure to check that there is no troubles in the multiplex communications system before performing the trouble shooting.

Fig 1: Troubleshooting Flow Chart