Code No. C1513: Excessive difference between torque sensor main and sub







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

DIAGNOSIS CODE SET CONDITIONS



  • The sum of the torque sensor main output voltage and sub output voltage does not agree with the predetermined value stored in the microcomputer, and the microcomputer determines that a problem has occurred in the mutual monitoring for the sensor main/sub systems.

CRITERIA FOR JUDGING MALFUNCTION



  • The difference between the torque sensor main output voltage and sub output voltage exceeds 0.408 V.

PROBABLE CAUSES



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

DIAGNOSIS PROCEDURE

STEP 1. 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. C1513 is set as a current trouble.

Q. Is diagnosis code C1513 set?
Go to Step 6.
Go to Step 2.

STEP 2. M.U.T.-III diagnosis code
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. C1511 or C1512 is set as a current trouble.

Q. Is diagnosis code C1511 or C1512 set?
Go to Step 3.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 3. 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 4.
Repair the damaged connector.

STEP 4. STEP 14. Resistance measurement between B-114-2 EPS-ECU connector terminal No. 1 and B-114-2 EPS-ECU connector terminal No. 3
(1)Disconnect the connector, and measure at the ECU side.
(2)Measure the resistance between B-114-2 EPS-ECU connector terminal No. 1 and B-114-2 EPS-ECU connector No. 3.
OK: Continuity exists (2 Ω or less).

Q. Is the check result normal?
Go to Step 5.
Replace EPS-ECU.

STEP 5. 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. C1511 or C1512 is set as a current trouble.

Q. Is diagnosis code C1511 or C1512 set?
Check that the torque sensor functions normally.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 6. Connector check: B-114-2 EPS-ECU connector

Q. Is the check result normal?
Go to Step 7.
Repair the damaged connector.

STEP 7. STEP 7. Wiring harness check between B-114-2 EPS-ECU connector and the torque sensor

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 8. M.U.T.-III data list
(1)Set the steering wheel in the straight-ahead position.
(2)Check the service data.

  • Item 01: Torque sensor main (Refer to .)
  • Item 02: Torque sensor sub (Refer to .)
  • Item 03: Torque sensor voltage (Refer to .)

Q. Is the check result normal?
Go to Step 10.
Go to Step 9.

STEP 9. Voltage measurement at B-114-2 EPS-ECU connector
(1)Without disconnecting the connector, measure by backprobing.
(2)Measure the voltage between B-114-2 EPS-ECU connector terminal No. 1 and No. 3. (Main)
Measure the voltage between B-114-2 EPS-ECU connector terminal No. 2 and No. 3. (Sub)
OK: Approximately 2.5 V

Q. Is the check result normal?
Go to Step 10.
Go to Step 11.

STEP 10. 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. C1513 is set as a current trouble.

Q. Is diagnosis code C1513 set?
Replace EPS-ECU.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 11. 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. 1 and No. 3. (Main)
Measure the resistance between B-114-2 EPS-ECU connector terminal No. 2 and No. 3. (Sub)
OK: 0.5 to 2.0 kΩ

Q. Is the check result normal?
Go to Step 12.
Replace the steering gear box & linkage assembly.

STEP 12. 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. C1513 is set as a current trouble.

Q. Is diagnosis code C1513 set?
Replace the steering gear box & linkage assembly.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)