Code No. U1100 EV ECU CAN timeout (1)


caution If the diagnosis code No. U1100 is output to the compressor & heater controller, be sure to carry out the CAN bus line diagnosis.
caution Before replacing ECU, ensure that the communication circuit is normal.

DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



  • Malfunction of the EV-ECU
  • Damaged harness wires and connectors
  • Malfunction of compressor & heater controller

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 lines. (Refer to GROUP 54C - Troubleshooting . ) After repairing the CAN bus lines, go to STEP 6.

STEP 2. M.U.T.-III diagnosis code for other systems
Check if the diagnosis code is set to the EV-ECU.

Q. Is the diagnosis code set?
Carry out the troubleshooting of the EV-ECU. Refer to .
Go to Step 3.

STEP 3. M.U.T.-III diagnosis code for other systems
Check if a diagnosis code, which relates to the CAN communication-linked systems below, is set.

  • Combination meter
    U1100: EV-ECU time-out

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 stored diagnosis code.
  2. Electric motor switch switch: Lock (OFF) → ON
  3. Check the diagnosis code.

Q. Is the diagnosis code set?
After replacing the EV-ECU, go to step 6.
A poor connection, open circuit or other intermittent malfunction is present in the CAN bus line between the EV-ECU and compressor & heater controller. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 5. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.

  1. Erase the stored diagnosis code.
  2. Electric motor switch switch: Lock (OFF) → ON
  3. Check the diagnosis code.

Q. Is the diagnosis code set?
After replacing the compressor & heater controller, go to step 6.
A poor connection, open circuit or other intermittent malfunction is present in the CAN bus line between the EV-ECU and compressor & heater controller. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 6. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.

  1. Erase the stored diagnosis code.
  2. Electric motor switch position: LOCK (OFF) → ON
  3. Check the diagnosis code.

Q. Is the diagnosis code set?
Return to Step 1.
The procedure is complete.