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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.-III) CAN bus diagnostics
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
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 the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) 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.-III) 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 ).
 
STEP 4. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is DTC C1521 or C1522 set?
Replace the EPS-ECU (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions ).