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DTC C1530 Motor FET driver
DTC C1531 Motor current too low
DTC C1532 Motor output current too large
DTC C1533 Motor terminal initial voltage
DTC C1534 Motor terminal monitor voltage
DTC C1535 Motor output current
DTC C1536 Motor terminal voltage too high
 
 
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 electric power steering-ECU.
 
 
 
FUNCTION
The voltage controlled by the torque sensor and resolver is supplied to the electric power steering-ECU.
 
 
 
TROUBLE JUDGMENT
Check Conditions
  • The battery voltage is more than 8 V or less than 17 V.
Judgment Criterion
  • The motor voltage does not meet a predetermined voltage stored in the microcomputer, and the microcomputer determines that there is a problem in the motor system.
Fail Safe, Back Up Function
  • The electric power steering-ECU stops the motor control and illuminates the electric power steering warning symbol, then sets DTC C1530, C1531, C1532, C1533, C1534, C1535, or C1536.
 
 
 
PROBABLE CAUSES
  • Malfunction of CAN bus line
  • Malfunction of the electric power steering-ECU
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use scan tool to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - Diagnosis/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 C1530, C1531, C1532, C1533, C1534, C1535 or C1536 set?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Using scan tool MB991958, check the data list
Check the following data list .
  • Item No. 04: Motor current
  • Item No. 05: Motor current (target)
  • Item No. 16: Motor current (unlimited target)
  • Item No. 17: Motor electric angle
  • Item No. 18: Motor speed
  • Item No. 19: Motor voltage
  • Item No. 25: Motor relay
  • Item No. A12: Motor current (target): rec.A1
  • Item No. A13: Motor cur. (unltd target): rec.A1
  • Item No. A14: Motor current: rec.A1
  • Item No. A22: Motor current (target): rec.A2
  • Item No. A23: Motor cur. (unltd target): rec.A2
  • Item No. A24: Motor current: rec.A2
  • Item No. A32: Motor current (target): rec.A3
  • Item No. A33: Motor cur. (unltd target): rec.A3
  • Item No. A34: Motor current: rec.A3
  • Item No. A42: Motor current (target): rec.A4
  • Item No. A43: Motor cur. (unltd target): rec.A4
  • Item No. A44: Motor current: rec.A4
  • Item No. A52: Motor current (target): rec.A5
  • Item No. A53: Motor cur. (unltd target): rec.A5
  • Item No. A54: Motor current: rec.A5
  • Item No. B12: Power relay voltage: rec V1
  • Item No. B22: Power relay voltage: rec V2
  • Item No. B32: Power relay voltage: rec V3
  • Item No. B42: Power relay voltage: rec V4
  • Item No. B52: Power relay voltage: rec V5
Is the check result normal?
Go to Step 6.
Go to Step 4.
 
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 C1530, C1531, C1532, C1533, C1534, C1535 or C1536 set?
Replace the electric power steering-ECU (Refer to ).Then go to Step 5.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
 
STEP 5. 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 C1530, C1531, C1532, C1533, C1534, C1535 or C1536 set?
Replace the steering column shaft assembly (Refer to ).Then go to Step 6.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
 
STEP 6. 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 C1530, C1531, C1532, C1533, C1534, C1535 or C1536 set?
Return to Step 1.
This diagnosis is complete.