37-C1521 MOTOR TURNING ANGLE (OUTPUT)

DTC C1521 Motor turning angle (output)
DTC C1522 Motor turning angle range

caution

If there is any problem in the CAN bus lines, an incorrect DTC 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

Power is supplied to the resolver from the EPS-ECU.

FUNCTION

To output the voltage based on the motor rotation angle to the EPS-ECU, the voltage is supplied to the resolver.

TROUBLE JUDGMENT

Check Conditions

The power supply circuit system DTC (No. C1540, C1541) is not set.

Judgment Criterion

The resolver input voltage or the resolver output voltage does not meet a predetermined voltage stored in the microcomputer, and the microcomputer determines that there is a problem in the resolver system.

Fail Safe, Back Up Function

The EPS-ECU stops the motor control and illuminates the electric power steering warning display, then sets DTC No. C1521 and C1522.

TROUBLESHOOTING HINTS

Malfunction of CAN bus line
Malfunction of the EPS-ECU

DIAGNOSIS

STEP 1. Scan tool (M.U.T.-IIISE) CAN bus diagnostics.

(1)

caution

To prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).

Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE)

(2) Turn on the power supply mode of the electric motor switch.

(3) Diagnose the CAN bus line.

(4) Turn off the power supply mode of the electric motor switch.

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. DTC recheck after resetting CAN bus lines.

(1) Erase the DTC.

(2) Turn off the power supply mode of the electric motor switch.

(3) Turn on the power supply mode of the electric motor switch.

(4) Check if the DTC is set.

Is DTC C1521 or C1522 set?

Go to Step 3

This diagnosis is complete.

STEP 3. Scan tool (M.U.T.-IIISE) data list.

Check the following data list (Refer to

Item No. 04: Motor current
Item No. 05: Motor current (target)
Item No. 17: Motor electric angle
Item No. 18: Motor speed

Is the check result normal?

Go to Step 4

Replace the EPS-ECU (Refer to