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Home >> Lexus >> 2007 >> ES 350 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - System And Circuit Testing, Active Control Engine Mount System (Including DTC P16A0 - P16A4), On-Vehicle Inspection, Removal, Inspection & Installation >> Active Control Engine Mount System >> Diagnosis System
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Diagnosis System

  1. DESCRIPTION 
    1. The active control engine mount ECU controls the functions of the CAN communication system on the vehicle. Data of the CAN communication system and the Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle.
      Fig 1: Identifying DLC3 (Data Link Connector 3)
      G05247600Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK DLC3 

    The vehicle's ECU uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAEJ 1962 and matches the ISO 15765-4 format.

    DATA LIST REFERENCE TABLE

    Symbols Terminal No. Names Reference terminal Results Condition
    SIL 7 Bus "+" line 5 - Signal ground Pulse generation During transmission
    CG 4 Chassis ground Body ground 1 Ω or less Always
    SG 5 Signal ground Body ground 1 Ω or less Always
    BAT 16 Battery ground Body ground 9 to 14 V Always
    CANH 6 CAN "High" line CANL 54 to 69 Ω Engine switch off
    CANH 6 CAN "High" line Battery positive 6 kΩ or higher Engine switch off
    CANH 6 CAN "High" line CG 200 Ω or higher Engine switch off
    CANL 14 CAN "Low" line Battery positive 6 kΩ or higher Engine switch off
    CANL 14 CAN "Low" line CG 200 Ω or higher Engine switch off

    HINT:

    The DLC3 is the interface prepared for reading various data from the vehicle's ECU. After connecting the cable of an intelligent tester, turn the engine switch on (IG) and turn the tester on. If a communication failure message is displayed on the tester screen (on the tester: UNABLE TO CONNECT TO VEHICLE), a problem exists in either the vehicle or tester. In order to identify the location of the problem, connect the tester to another vehicle. If communication is normal: Inspect the DLC3 on the original vehicle.

    If communication is still not possible: The problem is probably in the tester itself. Consult the Service Department listed in the instruction manual.

    1. Intelligent tester

      HINT:

      Connect the cable of the intelligent tester to the DLC3, turn the engine switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.

      Fig 2: Connecting Intelligent Tester To DLC3
      G05247599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
      • If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.
  3. INSPECT BATTERY VOLTAGE 

    Standard voltage: 

    11 to 14 V 

    If the voltage is below 11 V, recharge or replace the battery before proceeding.

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