CAN COMMUNICATION SYSTEM(w/o Toyota Safety Sense) Combination Meter ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Combination Meter ECU Communication Stop Mode

Either condition is met:


  • "Combination Meter" is not displayed on "Bus Check".

  • "Combination Meter ECU Communication Stop Mode" in "DTC Combination Table" applies.

  • Power source or inside combination meter assembly

  • Combination meter assembly main wire or connector

  • Combination meter assembly

WIRING DIAGRAM

A01VK4WE02

CAUTION / NOTICE / HINT

Note


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

  • Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.

  • Turn the ignition switch off before inspecting CAN bus wires for a ground short.

  • After the ignition switch is turned off, check that the key reminder warning system are not operating.

  • 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 any doors need to be opened in order to check connectors, open the doors and leave them open.

Tech Tips


  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • 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 OPEN IN CAN BUS WIRE (COMBINATION METER ASSEMBLY MAIN WIRE)

    A01VEYIE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Combination Meter Assembly)

    1. Disconnect the F1 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F1-32 (CANH) - F1-31 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (COMBINATION METER ASSEMBLY MAIN WIRE)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    A01VGLUE03
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Combination Meter Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F1-39 (IG+) - Body ground Ignition switch ON 11 to 14 V
      F1-40 (B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F1-14 (-) - Body ground Always Below 1 Ω
      F1-21 (ET) - Body ground Always Below 1 Ω

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)