Code No.U0164 A/C CAN timeout



caution
  • If the diagnosis code No. U0164 is stored, be sure to diagnose the CAN bus line.
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

DIAGNOSTIC FUNCTION


When the EV remote-ECU receives no signal from the A/C-ECU for 2.5 seconds or more, it will store diagnosis code No. U0164.

JUDGEMENT CRITERIA




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 ). Repair the CAN bus line and go to Step 2.

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


Check if diagnosis code is stored in the A/C-ECU.

Q. Is the diagnosis code stored?

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

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 stored.

Q. Is the diagnosis code stored?

Go to Step 4

Go to Step 5

STEP 4. Check whether the diagnosis code is stored again.


Check again if the diagnosis code is stored in the EV remote-ECU.
(1)Erase the diagnosis code.
(2)Turn the power supply mode of the electric motor switch from OFF to ON.
(3)Check if diagnosis code is stored.

Q. Is the diagnosis code stored?

Replace the A/C-ECU.

The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the A/C-ECU and the EV remote-ECU (GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

STEP 5. Check whether the diagnosis code is stored again.


Check again if the diagnosis code is stored in the EV remote-ECU.
(1)Erase the diagnosis code.
(2)Turn the power supply mode of the electric motor switch from OFF to ON.
(3)Check if diagnosis code is stored.

Q. Is the diagnosis code stored?

Replace the EV remote-ECU.

The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the A/C-ECU and the EV remote-ECU (GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).