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Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 235 (Can Communication System) >> Can Communication System >> ECM Communication Stop Mode >> Inspection Procedure
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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Turn the ignition switch OFF before measuring the resistances of the CAN main wire and the CAN branch wire.
  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

    HINT:

    Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  1. INSPECT ECM POWER SOURCE CIRCUIT 
    1. Inspect the power source circuit (See ECM POWER SOURCE CIRCUIT ).

    NG:  GO TO POWER SOURCE CIRCUIT

    OK: REPLACE ECM 

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