Code No.21 Meter (CAN message)


caution
  • If diagnosis code No.21 is set in the centre display, always diagnose the CAN bus lines.
  • Whenever the centre display unit is replaced, ensure that the communication circuit is normal.

TROUBLE JUDGMENT



PROBABLE CAUSES



  • Malfunction of the CAN bus line
  • Malfunction of the combination meter
  • Malfunction of the centre display unit
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Check the combination meter.



Q. Is the check result normal?





STEP 2. M.U.T.-III CAN bus diagnostics



Q. Is the check result normal?





STEP 3. M.U.T.-III other system diagnosis code



Q. Is the diagnosis code set?





STEP 4. Check whether the diagnosis code is reset.



(1)Erase the diagnosis code.
(2)Turn the ignition switch to the ON position from the LOCK (OFF) position.
(3)
caution It takes one minute until diagnosis code is detected.
On completion, check that the diagnosis code is not reset.

Q. Is the check result normal?





STEP 5. Check whether the diagnosis code is reset.



(1)Erase the diagnosis code.
(2)Turn the ignition switch to the ON position from the LOCK (OFF) position.
(3)
caution It takes one minute until diagnosis code is detected.
On completion, check that the diagnosis code is not reset.

Q. Is the check result normal?