Code No.C1531:
Motor terminal voltage
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- 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
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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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OPERATION
Power is supplied to the motor from the EPS-ECU.
DIAGNOSIS CODE SET CONDITION
The motor terminal voltage does not meet a predetermined voltage stored in the microcomputer, and
the microcomputer determines that there is a problem in the motor terminal voltage.
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
- Malfunction of the EPS-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is diagnosis code C1531 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Check the following connector.
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Check the connectors below for improper engagement, terminal damage or terminal drawn
in the connector case.
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 7.
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STEP 4. Wiring harness check
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(1)Check the wiring harness between the EPS-ECU connector terminals M+ or
M- and the motor for damage or other problem.
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(2)Check the wiring harness between the EPS-ECU connector terminal GND and the body
earth point for damage or other problem.
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 7.
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STEP 5. M.U.T.-III data list
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Check the following data list (Refer to ).
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- Item No. 19: Motor terminal voltage (+)
- Item No. 20: Motor terminal voltage (-)
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Q.
Is the check result normal?
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Go to Step 8.
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Go to Step 6.
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STEP 6. Check whether the diagnosis code is set again.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is diagnosis code C1531 set?
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Replace the EPS-ECU (Refer to ). Then go to Step
7.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunctions ).
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STEP 7. Check whether the diagnosis code is set again.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is diagnosis code C1531 set?
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Replace the steering column shaft assembly (Refer to ).
Then go to Step 8.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunctions ).
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STEP 8. Check whether the diagnosis code is set again.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is diagnosis code C1531 set?
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Return to Step 1.
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This diagnosis is complete.
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