Code No.C1561 Engine revolution data (CAN)



caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnostics Table).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION



    EPS-ECU receives engine revolution signal from the engine-ECU.

FUNCTION



    The engine speed signal is sent to the EPS-ECU for motor control.

TROUBLE JUDGEMENT


Check Conditions
  • The power supply circuit system diagnosis code (No. C1540, C1541) is not set.
  • The engine circuit system diagnosis code is not set.
Judgement Criterion
  • The engine speed signal sent to the EPS-ECU is no signal.
  • The engine speed signal is not sent from the engine-ECU, and the microcomputer determines that there is a problem in the engine speed measurement system.
Fail Safe, Back Up Function
  • The EPS-ECU illuminates the electric power steering warning display, and sets the diagnosis code No. C1561. Normally the assist operation is continued while the vehicle is driven, but deactivated after the vehicle stopped.

PROBABLE CAUSES



  • Malfunction of CAN bus line
  • Malfunction of the EPS-ECU
  • Malfunction of the engine-ECU

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics


Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines


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

Q. Is the diagnosis codes C1561 set?

Go to Step 3.
This diagnosis is complete.

STEP 3. M.U.T.-III data list


Check the following service data .

  • Item No. 07: Engine speed

Q. Is the check result normal?

Go to Step 5.
Perform troubleshooting for engine-ECU (Refer to GROUP 13A - Troubleshooting/Inspection Chart for Diagnosis code <4B1>, GROUP 13C - Troubleshooting/Inspection Chart for Diagnosis code <4J1>, GROUP 13D - Troubleshooting/Inspection Chart for Diagnosis code <4N1>). Then go to Step 4.

STEP 4. Check whether the diagnosis code is reset


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

Q. Is the diagnosis codes C1561 set?

Replace the EPS-ECU (Refer to ). Then go to Step 5.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 5. Check whether the diagnosis code is reset.


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

Q. Is the diagnosis codes C1561 set?

Return to Step 1.
This diagnosis is complete.