Code No.C1513 Large difference between main torque sensor and sub torque sensor


caution Whenever the ECU is replaced, 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 meet a 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 sum of the torque sensor main output voltage and sub output voltage is more than 5.3 V or less than 4.7 V.

PROBABLE CAUSES

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

DIAGNOSIS PROCEDURE

STEP 1. 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)Check whether diagnosis code C1513 is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code C1513 set?

Go to Step 6.

Go to Step 2.

STEP 2.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)Check whether diagnosis code C1511 or C1512 is set as past trouble.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code C1513 set as past trouble?

Go to Step 3.

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

STEP 3. Check the harness wires between electric power steering-ECU connector B-106-1 (terminals 13) and torque sensor.

Q. Is any wire between electric power steering-ECU connector B-106-1 (terminals 13) and torque sensor damaged?

Repair the harness connector and terminal, or replace the steering gear box and linkage assembly (Refer to ).

Go to Step 4.

STEP 4. Check the earth circuit to the electric power steering-ECU for open circuit.

Disconnect electric power steering-ECU connectors B-105 and B-106-1, and measure the internal resistance in the ECU.

  • Measure the resistance between connector B-105 terminal 21 and connector B-106-1 terminal 13.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Replace the electric power steering-ECU (Refer to ).

Go to Step 5.

STEP 5. 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)Check if the diagnosis code is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code C1513 set?

Check that the torque sensor functions normally.(Refer to ).

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

STEP 6. Check the torque sensor for short to earth with resistance or resistance increase.


  • Harness wire between electric power steering-ECU connector B-106-1 and the torque sensor
  • Check electric power steering-ECU connector B-106-1 and its terminals.

Q. Are the wiring harness and the connectors in good condition?

Go to Step 7.

Repair the harness connector and terminal, or replace the steering gear box and linkage assembly (Refer to ).

STEP 7. Check the torque sensor output voltage.

Use the M.U.T.-III voltage measurement and data list functions to measure the torque sensor main voltage or sub voltage before the fail-safe relay is activated (one second after the engine is started) without disconnecting connector B-106-1 (by backprobing).

  • The steering is in the neutral position.
  • Between connector B-106-1 terminals 12 and 13 (for main system)
    Between connector B-106-1 terminals 13 and 16 (for sub system)
  • Item 01: Torque sensor main system (Refer to ).
  • Item 02: Torque sensor sub system (Refer to ).
  • Item 03: Torque sensor voltage (Refer to ).
OK: 2.4 - 2.6 V

Q. Is the check result normal?

Go to Step 8.

Go to Step 9.

STEP 8. 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)Check if the diagnosis code is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code C1513 set?

Replace the electric power steering-ECU (Refer to ).

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

STEP 9. Check the sensor circuit of the electric power steering-ECU for short to earth.

Disconnect electric power steering-ECU connector B-106-1, and measure the internal resistance in the ECU.

  • Measure the resistance between connector B-106-1 terminals 12 and 13.<Main>
  • Measure the resistance between connector B-106-1 terminals 13 and 16.<Sub>
OK: 0.5 - 1.5 kΩ

Q. Is the check result normal?

Go to Step 10.

Replace the steering gear box and linkage assembly (Refer to ).

STEP 10. 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)Check if the diagnosis code is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.
(7)Disconnect M.U.T.-III.

Q. Is diagnosis code C1513 set?

Replace the steering gear box and linkage assembly (Refer to ).

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