C1534
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 abnormality (high voltage)
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 CAN Bus Diagnostics Chart ).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
OPERATION
Power is supplied to the motor from the EPS-ECU.
FUNCTION
The voltage controlled by the torque sensor and resolver is supplied to the motor from the EPS-ECU.
TROUBLE JUDGEMENT
Check Conditions
The battery voltage is more than 9 V or less than 17.5 V.
Judgement 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 EPS-ECU stops the motor control and illuminates the electric power steering warning display, then sets the DTCs C1530, C1531, C1532, C1533, C1534, C1535, or C1536.
PROBABLE CAUSES
- Malfunction of CAN bus line
- Defective motor of the steering column shaft assembly
- Defective harness wire(s) or connector(s)
- Short or open circuit between the EPS-ECU and the motor or loose connector contact
- Open circuit between the body ground and the EPS-ECU or loose connector contact
- Malfunction of the EPS-ECU
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use scan tool to diagnose the CAN bus lines.
Q. Is the check result normal?
YES Go to Step 3.
NO Repair the CAN bus lines CAN Bus Diagnostics Chart). 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.
Q. Is the DTCs C1530,C1531,C1532,C1533,C1534,C1535 or C1536 set?
YES Go to Step 3.
NO This diagnosis is complete.
STEP 3. Check the following connector.
Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case.
- C-221-2, C-221-3 and C-222 EPS-ECU connector
- Body ground point
Q. Is the connectors and terminals in good condition?
YES Go to Step 4.
NO Go to Step 7.
STEP 4. Wiring harness check
(1)Check the wiring harness between the C-221-2 EPS-ECU connector terminals No.41 or No.42 and the motor for damage or other problem.
(2)Check the wiring harness between the C-221-3 EPS-ECU connector terminal No.51 and the motor for damage or other problem.
(3)Check the wiring harness between the C-222 EPS-ECU connector terminal No.12 and the body ground point for damage or other problem.
Q. Is the wiring harness in good condition?
YES Go to Step 5.
NO Go to Step 7.
STEP 5. Using scan tool MB991958, check the data list
Check the following data list Data List Reference Table.
- 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
Q. Is the check result normal?
YES Go to Step 8.
NO Go to Step 6.
STEP 6. Check whether the DTC is reset.
(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.
Q. Is the DTCs C1530,C1531,C1532,C1533,C1534,C1535 or C1536 set?
YES Replace the EPS-ECU (Refer to Service and Repair).Then go to Step 7.
NO Intermittent malfunction How to Cope With Intermittent Malfunctions).
STEP 7. Check whether the DTC is reset.
(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.
Q. Is the DTCs C1530,C1531,C1532,C1533,C1534,C1535 or C1536 set?
YES Replace the steering column shaft assembly (Refer to Removal and Replacement).Then go to Step 8.
NO Intermittent malfunction How to Cope With Intermittent Malfunctions).
STEP 8. Check whether the DTC is reset.
(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.
Q. Is the DTCs C1530,C1531,C1532,C1533,C1534,C1535 or C1536 set?
YES Return to Step 1.
NO This diagnosis is complete.