Diagnosis System
WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
- DESCRIPTION
- The hybrid vehicle control ECU controls the function of the immobilizer system on the vehicle. Data from the immobilizer system and the Diagnostic Trouble Code (DTC) can be read in the Data Link Connector 3 (DLC3) of the vehicle. When a malfunction occurs in the immobilizer system, even though the security indicator lamp does not come on, DTCs can be checked.
Therefore, when the immobilizer system seems to be a malfunction, use the intelligent tester to check for a malfunction and repair it.
- The hybrid vehicle control ECU controls the function of the immobilizer system on the vehicle. Data from the immobilizer system and the Diagnostic Trouble Code (DTC) can be read in the Data Link Connector 3 (DLC3) of the vehicle. When a malfunction occurs in the immobilizer system, even though the security indicator lamp does not come on, DTCs can be checked.
- CHECK DLC3
- The vehicle's ECM uses the ISO 9141-2 for communication protocol. The terminal arrangement of the DLC3 complies with the SAEJ1962 and matches the ISO 9141-2 format.DLC3
Tester Connection Condition Specified Condition 7 (Bus+line) - 5 (Signal ground) During communication Pulse generation 4 (Chassis ground) - Body ground Always Below 1 Ω 5 (Signal ground) - Body ground Always Below 1 Ω 16 (B+) - Body ground Always 9 to 14 V HINT:
If the screen displays a communication error message after you have connected the cable of the intelligent tester to the DLC3, turned the ignition switch ON and used the intelligent tester, the problem may be on the vehicle side or the tester side.
- If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
- If communication is still impossible when the tester is connected to another vehicle, the problem may be in the tester itself, so consult the Service Department listed in the tester's is instruction manual.
- The vehicle's ECM uses the ISO 9141-2 for communication protocol. The terminal arrangement of the DLC3 complies with the SAEJ1962 and matches the ISO 9141-2 format.