If the diagnosis
code No. U0245 is set, be sure to diagnose the CAN bus line.
Before replacing the combination meter or CAN box unit (MMCS), ensure that the power supply
circuit, the earth circuit and the communication circuit are normal.
DIAGNOSTIC FUNCTION
If the signal from CAN box unit (MMCS) cannot be received, the combination meter sets
the diagnosis code No. U0245.
JUDGEMENT CRITERIA
With the ignition switch is at ON position, the diagnosis code No. U1190 is not stored
and the diagnosis code No. U1195 is not stored, if the communication with CAN box unit (MMCS)
cannot be established for 2500 ms or more, the combination meter determines that a problem has
occurred.
PROBABLE CAUSES
Malfunction of CAN bus line
Malfunction of the CAN box unit (MMCS)
Malfunction of the combination meter
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
Repair the CAN bus line and go to Step 6.
STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the CAN box unit (MMCS).
Q.
Is the diagnosis code set?
Troubleshoot the CAN box unit (MMCS).
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN communication-linked systems below, is
set.
ETACS-ECU
Code No.U0245: AND CAN timeout
Q.
Is the diagnosis code set?
Go to Step 4.
Go to Step 5.
STEP 4. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Turn the ignition switch to "ON" position.
(3)On completion, check that the diagnosis code is not reset.
Q.
Is the diagnosis code set?
Replace CAN box unit (MMCS) and then go to Step 6.
A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the CAN box unit (MMCS) and the combination meter (Refer to GROUP
00 - How to use troubleshooting/Inspection Service Points ).
STEP 5. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Turn the ignition switch to "ON" position.
(3)On completion, check that the diagnosis code is not reset.
Q.
Is the diagnosis code set?
Replace combination meter and then go to Step 6.
A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the CAN box unit (MMCS) and the combination meter (Refer to GROUP
00 - How to use troubleshooting/Inspection Service Points ).
STEP 6. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Turn the ignition switch to "ON" position.
(3)On completion, check that the diagnosis code is not reset.