Code No. C1514: Abnormal torque sensor power supply







caution Before replacing ECU, ensure that the communication circuit is normal.

DIAGNOSIS CODE SET CONDITIONS



  • The torque sensor power supply monitor voltage does not meet a predetermined voltage stored in the microcomputer, and the microcomputer determines that there is a problem in the torque power supply voltage.

CRITERIA FOR JUDGING MALFUNCTION



  • The power supply voltage exceeds 5.5 V or less than 4.5 V.

PROBABLE CAUSES



  • Defective harness wire(s) or connector(s)
  • Defective torque sensor of the steering gear and linkage assembly
  • The EPS-ECU is defective.

DIAGNOSIS PROCEDURE

STEP 1. Wiring harness check between B-114-2 EPS-ECU connector terminal No. 1, 2, 3 and the torque sensor

Q. Is the check result normal?
Go to Step 2.
Repair the wiring harness.

STEP 2. Measure the resistance at B-114-2 EPS-ECU connector.
(1)Disconnect the connector, and measure at the ECU side.
(2)Measure the resistance between B-114-2 EPS-ECU connector terminal No. 3 and No. 4.
OK: 400 to 800 Ω

Q. Is the check result normal?
Go to Step 3..
Replace EPS-ECU.

STEP 3. Measure the resistance at B-114-2 EPS-ECU connector.
(1)Disconnect the connector and measure at the wiring harness side.
(2)Measure the resistance between B-114-2 EPS-ECU connector terminal No. 4 and the body earth.
OK: Continuity exists. (100 Ω or more)
(3)Measure the resistance between B-114-2 EPS-ECU connector terminal No. 3 and No. 4.
OK: Continuity exists. (100 Ω or more)

Q. Is the check result normal?
Go to Step 4.
Replace the steering gear & linkage assembly.

STEP 4. Diagnosis code recheck
Recheck if the diagnosis code is set.
(1)Turn the electric motor switch to the "LOCK" (OFF) → "ON" position.
(2)Check if the diagnosis code No. C1514 is set as a current trouble.

Q. Is diagnosis code C1514 set?
Replace EPS-ECU.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)