CAN COMMUNICATION SYSTEM(for LHD) Suspension Control ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Suspension Control ECU Communication Stop Mode

Either Condition is met:


  • "Suspension Control (Air Suspension)" is indicated on the "Bus Check" screen Click here

  • Communication system DTCs (DTCs that start with U) that are output correspond to "Suspension Control ECU Communication Stop Mode" in "DTC Combination Table" Click here


  • Absorber control ECU CAN branch wire or connector

  • Power source circuit of absorber control ECU

  • Absorber control ECU ground circuit

  • Absorber control ECU

WIRING DIAGRAM

B002BPLE12
*a No. 5 CAN Junction Connector
*b No. 4 CAN Junction Connector
*c from RH-IG1 RLY2 Relay
*d Absorber Control ECU

CAUTION / NOTICE / HINT

Note


  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output Click here.

  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notice before proceeding with work Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Drive the vehicle for approximately 11 seconds or more at a speed of 20 km/h (12 mph) or more.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed Click here.

Tech Tips


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

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (ABSORBER CONTROL ECU CAN BRANCH WIRE)


    1. B002C03E01
      Text in Illustration
      *A Bus 4
      *B Bus 5
      *a

      Rear view of wire harness connector

      (to Absorber Control ECU)

      Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the absorber control ECU connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Bus 4
      Tester Connection Condition Specified Condition
      N105-20 (CA2H) - N105- 21 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Bus 5
      Tester Connection Condition Specified Condition
      N105-7 (CANH) - N105-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE ABSORBER CONTROL ECU CAN BRANCH WIRE OR CONNECTOR (CA2H, CA2L, CANH, CANL)

    OK

  2. CHECK HARNESS AND CONNECTOR (ABSORBER CONTROL ECU - BATTERY AND BODY GROUND)


    1. B002BRME03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Absorber Control ECU)

      Connect the cable to the negative (-) auxiliary battery terminal.

      Note

      When connecting the cable, some systems need to be initialized after the cable is reconnected Click here.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N105-3 (B) - Body ground Power switch on (IG) 11 to 14 V

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N105-5 (GND) - Body ground Always Below 1 Ω

    OK

    REPLACE ABSORBER CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR