Code No. C1511:
Abnormal torque sensor (main)/C1512: Abnormal torque sensor (sub)
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Before replacing ECU, ensure that the communication circuit is normal.
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DIAGNOSIS CODE SET CONDITIONS
C1511: Torque sensor main system malfunction
- The torque sensor main output voltage does not agree with the predetermined voltage
stored in the microcomputer, and the microcomputer determines that a problem has occurred in
the torque sensor main system.
C1512: Torque sensor sub system malfunction
- The torque sensor sub output voltage does not agree with the predetermined voltage
stored in the microcomputer, and the microcomputer determines that a problem has occurred in
the torque sensor sub system.
CRITERIA FOR JUDGING MALFUNCTION
C1511: Torque sensor main system malfunction
- The torque sensor main output voltage exceeds 4.8 V or less than 0.2 V.
C1512: Torque sensor sub system malfunction
- The torque sensor sub output voltage exceeds 4.8 V or less than 0.2 V.
PROBABLE CAUSES
C1511: Torque sensor main system malfunction
- Defective harness wire(s) or connector(s)
- Defective torque sensor of the steering gear and linkage assembly
- Malfunction of the EPS-ECU
C1512: Torque sensor sub system malfunction
- Defective harness wire(s) or connector(s)
- Defective torque sensor of the steering gear and linkage assembly
- Malfunction of the EPS-ECU
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STEP 1. M.U.T.-III diagnosis code
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Recheck if the diagnosis code is set.
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(1)Erase the stored diagnosis code.
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(2)Turn the electric motor switch to the "LOCK" (OFF) → "ON" position.
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(3)Start the electric motor unit.
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(4)Check if the diagnosis code is set.
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Q.
Is the diagnosis code, which has been set before starting the electric motor unit,
still set?
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Go to Step 2..
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Go to Step 12..
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STEP 2. M.U.T.-III diagnosis code
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Recheck if the diagnosis code is set.
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(1)Turn the electric motor switch to the "LOCK" (OFF) → "ON" position.
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(2)Check if the diagnosis code No. C1511 and C1512 are set as the current trouble.
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Q.
Are the diagnosis code No. C1511 and C1512 set?
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Go to Step 9..
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Go to Step 3..
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STEP 3. Wiring harness check between B-114-2 EPS-ECU connector terminal
No. 1, 2, 3 and the torque sensor
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Q.
Is the check result normal?
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Go to Step 4..
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Repair the wiring harness.
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STEP 4. M.U.T.-III data list
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(1)Set the steering wheel in the straight-ahead position.
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(2)Check the service data.
- Item 01: Torque sensor main (Refer to .)
- Item 02: Torque sensor sub (Refer to .)
- Item 03: Torque sensor power supply voltage (Refer to .)
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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 5.
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STEP 5. Voltage measurement at B-114 EPS-ECU connector
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(1)Without disconnecting the connector, measure by backprobing.
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(2)Measure the voltage between B-114-2 EPS-ECU connector terminal No. 1 and No. 3.
(Main) OK: Approximately 2.5 V
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(3)Measure the voltage between B-114-2 EPS-ECU connector terminal No. 2 and No. 3.
(Sub) OK: Approximately 2.5 V
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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. Measure the resistance at B-114-2 EPS-ECU connector.
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(1)Disconnect the connector, and measure at the ECU side.
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(2)Measure the resistance between B-114-2 EPS-ECU connector terminal No. 1 and No.
3. (Main) OK: 0.5 to 2.0 Ω
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(3)Measure the resistance between B-114-2 EPS-ECU connector terminal No. 2 and No.
3. (Sub) OK: 0.5 to 2.0 Ω
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Q.
Is the check result normal?
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Go to Step 7.
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Replace EPS-ECU.
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STEP 7. Diagnosis code recheck
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Recheck if the diagnosis code is set.
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(1)Turn the electric motor switch to the "LOCK" (OFF) → "ON" position.
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(2)Check if the diagnosis code No. C1511 and C1512 are set as the current trouble.
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Q.
Are the diagnosis code No. C1511 and C1512 set?
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Replace the steering gear box & linkage assembly.
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Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction .)
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STEP 8. Diagnosis code recheck
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Recheck if the diagnosis code is set.
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(1)Turn the electric motor switch to the "LOCK" (OFF) → "ON" position.
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(2)Fully turn the steering wheel to both left and right.
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(3)Check if the diagnosis code No. C1511 and C1512 are set as the current trouble.
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Q.
Are the diagnosis code No. C1511 and C1512 set?
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Replace EPS-ECU.
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Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction .)
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STEP 9. Wiring harness check between B-114-2 EPS-ECU connector terminal
No. 1, 2, 3 and the torque sensor
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Q.
Is the check result normal?
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Go to Step 10..
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Repair the wiring harness.
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STEP 10. Voltage measurement at B-114-2 EPS-ECU connector
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(1)Without disconnecting the connector, measure by backprobing.
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(2)Turn the electric motor switch to the "ON" position.
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(3)Measure the voltage between B-114-2 EPS-ECU connector terminal No. 4 and the body
earth. OK: 4.5 to 5.5 V
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Q.
Is the check result normal?
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Go to Step 11..
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Replace EPS-ECU.
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STEP 11. Diagnosis code recheck
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Recheck if the diagnosis code is set.
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(1)Turn the electric motor switch to the "LOCK" (OFF) → "ON" position.
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(2)Fully turn the steering wheel to both left and right.
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(3)Check if the diagnosis code No. C1511 and C1512 are set as the current trouble.
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Q.
Are the diagnosis code No. C1511 and C1512 set?
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Replace the steering gear box & linkage assembly.
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Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction .)
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STEP 12. M.U.T.-III diagnosis code
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Recheck if the diagnosis code is set.
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(1)Turn the electric motor switch to the "LOCK" (OFF) → "ON" position.
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(2)Check if the diagnosis code No. C1514 is set.
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Q.
Is diagnosis code C1514 set?
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Go to Step 13..
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Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction .)
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STEP 13. Wiring harness check between B-114-2 EPS-ECU connector terminal
No. 1, 2, 3 and the torque sensor
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Q.
Is the check result normal?
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Go to Step 14..
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Repair the wiring harness.
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STEP 14. STEP 14. Resistance measurement between B-114-2 EPS-ECU connector terminal
No. 1 and B-114-2 EPS-ECU connector terminal No. 3
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(1)Disconnect the connector, and measure at the ECU side.
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(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).
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Q.
Is the check result normal?
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Go to Step 15.
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Replace EPS-ECU.
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STEP 15. Diagnosis code recheck
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Recheck if the diagnosis code is set.
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(1)Turn the electric motor switch to the "LOCK" (OFF) → "ON" position.
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(2)Fully turn the steering wheel to both left and right.
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(3)Check if the diagnosis code No. C1511 and C1512 are set as the current trouble.
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Q.
Are the diagnosis code No. C1511 and C1512 set?
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Replace the steering gear box & linkage assembly.
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Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction .)
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