Code No.U0164 A/C-ECU CAN timeout


caution
  • If the diagnosis code No. U0164 is set, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSTIC FUNCTION


If the signal from A/C-ECU cannot be received, the combination meter sets the diagnosis code No. U0164.

JUDGMENT CRITERIA


With the statuses that the ignition switch is at ON position, system voltage is 10-16 V (data from ETACS-ECU), and there is no malfunction to the power supply fuse, or odometer value is 80.5 km or more, if the communication with A/C-ECU cannot be established for 2,500 ms or more, the combination meter determines that a problem has occurred.

PROBABLE CAUSES



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 ).

STEP 2. M.U.T.-III other system diagnosis code


Check if diagnosis code is set to the A/C-ECU.

Q. Is the diagnosis code set?

Troubleshoot the A/C-ECU (Refer to GROUP 55 - Troubleshooting ).

Go to Step 3.

STEP 3. Check whether the diagnosis code is reset.


Check again if the diagnosis code is set to the combination meter.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?

Replace the combination meter.

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).