LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2008 >> ES 350 >> Repair and Diagnosis >> External Pages >> Different car >> Section 82 (Can Communication) >> Can Communication System >> Active Control Engine Mount ECU Communication Stop Mode >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Turn the engine switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.
  • After the engine 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 engine switch, any other switches, or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:

Operating the engine switch, any switches, or any doors triggers related ECU and sensor communication with the CAN. This communication will cause the resistance value to change.

  1. CHECK OPEN IN CAN NO. 1 BUS WIRE (ACTIVE CONTROL ENGINE MOUNT ECU BRANCH WIRE) 
    1. Turn the engine switch off.
    2. Disconnect connector A9 from the active control engine mount ECU.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Value
      A9-14 (CANH) - A9-13 (CANL) Engine Switch off 54 to 69 Ω
    Fig 1: Disconnecting Connector A9 From Active Control Engine Mount ECU
    G05254975Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE CAN NO. 1 BUS BRANCH WIRE OR CONNECTOR (ACTIVE CONTROL ENGINE MOUNT ECU) 

    OK: Go to Next Step 

  2. CHECK HARNESS AND CONNECTOR (IG2, GND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Value
      A9-12 (GND) - Body Ground Engine Switch off Below 1 Ω
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Value
      A9-10 (IG2) - Body Ground Engine Switch on (IG) 10 to 14 V
      Fig 2: Identifying Active Control Engine Mount ECU Connector Terminals
      G05254976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ACTIVE CONTROL ENGINE MOUNT ECU  (See ON-VEHICLE INSPECTION )

scientia non olet · About LEMON Manuals