COde No.C1532 Over real current of motor


caution
  • If the electric power steering-ECU sets diagnosis code No.C1532, diagnose the CAN bus lines. If there is any fault in the CAN bus lines, an incorrect diagnosis code may be set.
  • Whenever the ECU is replaced, ensure that the communication circuit is normal.


DIAGNOSIS CODE SET CONDITIONS

  • The motor current does not meet a predetermined limit stored in the microcomputer, and the microcomputer determines that there is a problem in the motor current limit.
    • Criteria for judging malfunction
    • Actual measurement value of the motor current (absolute value) is more than 65 A

PROBABLE CAUSES

  • Defective harness wire(s) or connector(s)
  • Defective motor of the steering gear and linkage assembly
  • Malfunction of the electric power steering-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

caution Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.
Check again if the diagnosis code is set.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Start the engine, and check the diagnosis code.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code C1531 set?

Carry out the troubleshooting for diagnosis code C1531 (Refer to ).

Go to Step 2.

STEP 2. Check the electric power steering-ECU connector B-105-1.


  • B-105-1 electric power steering-ECU connector
Check the connectors above for improper engagement, terminal damage or terminal drawn in the connector case.

Q. Is the check result normal?

Go to Step 3.

Repair the connector(s) or terminal(s).

STEP 3. Check whether the diagnosis code is reset.

caution Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.
Check again if the diagnosis code is set.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Start the engine.
(6)Check if the diagnosis code is set.
(7)Turn the ignition switch to the "LOCK" (OFF) position.
(8)Disconnect M.U.T.-III.

Q. Is diagnosis code C1532 set?

Replace the electric power steering-ECU (Refer to ). If the concern is not eliminated after the electric power steering-ECU is replaced, replace the power steering gear box.

The malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .