Code No.C1512 Torque sensor main/sub voltage
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- If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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- Power is supplied to the torque sensor from the electric power steering-ECU.
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- The voltage based on the input torque is output to the electric power steering-ECU from the torque sensor main and torque sensor sub, and the sum of the torque sensor main output voltage and sub output voltage values are monitored for motor control.
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Check Conditions
- With the torque sensor power supply ON, 5 V is supplied to the torque sensor.
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Judgement Criterion
- The sum of the torque sensor main output voltage and sub output voltage is more than 5.375 V or less than 4.625 V.
- 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.
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Fail Safe, Back Up Function
- The electric power steering-ECU stops the motor control and illuminates the electric power steering warning display, then sets the diagnosis code No. C1512.
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- Malfunction of CAN bus line
- Defective torque sensor of the steering gear and linkage assembly
- Defective harness wire(s) or connector(s)
- Short or open circuit between the electric power steering-ECU and the torque sensor or loose connector contact
- Malfunction of the electric power steering-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting  ). On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis codes C1512 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Check the following connector.
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Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case.
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- C-113 and C-114-1 electric power steering-ECU connector
- Intermediate connector of the wiring harness for steering gear box & linkage assembly (connection and appearance checks only)
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Q.
Is the connectors and terminals in good condition?
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Go to Step 4.
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Replace the steering gear and linkage assembly (Refer to ). Then go to Step 8.
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STEP 4. Wiring harness check
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(1)Check the wiring harness between the C-114-1 electric power steering-ECU connector terminal No.26 and the torque sensor main for damage or other problem .
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(2)Check the wiring harness between the C-114-1 electric power steering-ECU connector terminal No.24 and the torque sensor sub for damage or other problem .
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Q.
Is the wiring harness in good condition?
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Go to Step 5.
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Replace the steering gear and linkage assembly (Refer to ). Then go to Step 8.
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STEP 5. Voltage measurement at the electric power steering-ECU connector
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(1)The steering is in the neutral position.
(2) Measure the electric power steering-ECU voltage without disconnecting the connector (by backprobing).
(3)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(4)Measure the voltage between the C-114-1 electric power steering-ECU connector terminal No.26 and the C-113 electric power steering-ECU connector terminal No.12(for main system).
OK: 2.5±0.05 V
(5)Measure the voltage between the C-114-1 electric power steering-ECU connector terminal No.24 and the C-113 electric power steering-ECU connector terminal No.12(for sub system).
OK: 2.5±0.05 V
Q.
Is the check result normal?
Go to Step 6.
Replace the steering gear and linkage assembly (Refer to ).Then go to Step 8.
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STEP 6. M.U.T.-III data list
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(1)The steering is in the neutral position.
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(2)Check the following service data .
- Item No. 01: Torque sensor(main)
- Item No. 02: Torque sensor(sub)
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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 7.
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STEP 7. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis codes C1512 set?
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Replace the electric power steering-ECU (Refer to ).Then go to Step 8.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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STEP 8. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis codes C1512 set?
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Return to Step 1.
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This diagnosis is complete.
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