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Power is supplied to the torque sensor from the EPS-ECU.
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To output the voltage based on the input torque from the torque sensor to the EPS-ECU,
the voltage is supplied to the torque sensor.
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Check Conditions
Torque sensor power supply ON
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Judgement Criterion
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
sensor power supply voltage.
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Fail Safe, Back Up Function
The EPS-ECU stops the motor control and illuminates the electric power steering
warning display, then sets the diagnosis code No. C1514.
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- Malfunction of CAN bus line
- Defective torque sensor of the steering column shaft assembly
- Defective harness wire(s) or connector(s)
- Short or open circuit between the EPS-ECU and the torque sensor or loose
connector contact
- Open circuit between the body earth and the EPS-ECU or loose connector contact
- Malfunction of the EPS-ECU
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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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Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
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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 code C1514 set?
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This diagnosis is complete.
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(1)The steering is in the neutral position.
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(2) Measure the EPS-ECU voltage without disconnecting the connector (by backprobing).
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(3)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(4)Measure the voltage between the EPS-ECU connector (TSV terminal) and the EPS-ECU
connector (TSE terminal). OK: 5 ± 0.2 V
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Q.
Is the check result normal?
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Q.
Is the check result normal?
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(1)The steering is in the neutral position.
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(2)Check the following data list .
- Item No. 03: Torque sensor(power supply)
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Q.
Is the check result normal?
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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 code C1514 set?
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Replace the EPS-ECU (Refer to ).Then go to
Step 7.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunctions ).
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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 code C1514 set?
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Replace the steering column shaft assembly (Refer to ).
Then go to Step 8.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunctions ).
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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 code C1514 set?
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This diagnosis is complete.
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