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DTC C1514 Torque sensor power supply too low
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
OPERATION
Power is supplied to the torque sensor from the EPS-ECU.
 
 
 
FUNCTION
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.
 
 
 
TROUBLE JUDGMENT
Check Conditions
  • Torque sensor power supply ON
Judgment 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.
Fail Safe, Back Up Function
  • The EPS-ECU stops the motor control and illuminates the electric power steering warning display, then sets DTC No. C1514.
 
 
 
TROUBLESHOOTING HINTS
  • 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 ground and the EPS-ECU or loose connector contact
  • Malfunction of the EPS-ECU
 
 
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Scan tool (M.U.T.-IIISE) CAN bus diagnostics.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Turn on the power supply mode of the electric motor switch.
(3) Diagnose the CAN bus line.
(4) Turn off the power supply mode of the electric motor switch.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
 
STEP 2. DTC recheck after resetting CAN bus lines.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check if the DTC is set.
Is DTC C1514 set?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Voltage measurement at EPS-ECU connector (TSV, TSE terminal).
(1) The steering is in the neutral position.
(2) Measure the EPS-ECU voltage without disconnecting the connector (by backprobing).
(3) Turn off the power supply mode of the electric motor switch.
(4) Turn on the power supply mode of the electric motor switch.
(5) Measure the voltage between the EPS-ECU connector (TSV terminal) and the EPS-ECU connector (TSE terminal).
OK: 5 ± 0.2 V
Is the check result normal?
Go to Step 5.
Go to Step 4.
 
STEP 4. Check of short to ground, and open circuit in TSV and TSE line between EPS-ECU connector and torque sensor.
Is the check result normal?
Go to Step 5.
Go to Step 7.
 
STEP 5. Scan tool (M.U.T.-IIISE) data list.
(1) The steering is in the neutral position.
(2) Check the following data list (Refer to ).
  • Item No. 03: Torque sensor(power supply)
Is the check result normal?
Go to Step 7.
Go to Step 6.
 
STEP 6. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check if the DTC is set.
Is DTC C1514 set?
Replace the EPS-ECU (Refer to ). Then go to Step 7.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions ).
 
STEP 7. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check if the DTC is set.
Is DTC C1514 set?
Replace the steering column shaft assembly (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions ).