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Code No.C1514: Torque sensor power supply
Code No.C1516: Torque sensor power voltage low
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be stored. 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 EPS-ECU from the torque sensor.
 
 
DIAGNOSTIC TROUBLE CODE SET CONDITION
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 power supply voltage.
 
 
PROBABLE CAUSES
  • 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
STEP 1. scan tool MB991958 CAN bus diagnostics
Use scan tool MB991958 to diagnose the CAN bus lines.
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. Diagnostic trouble code recheck after resetting CAN bus lines
(1) Erase the diagnostic trouble code.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the diagnostic trouble code is stored.
Is diagnostic trouble code C1514 or C1516 stored?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Check the following connector.
Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case.
  • EPS-ECU connector
  • Body ground point
  • Torque sensor intermediate connector of the wiring harness for steering column shaft assembly (connection and appearance checks only)
Is the check result normal?
Go to Step 4.
Go to Step 8.
 
STEP 4. Wiring harness check
(1) Check the wiring harness between the EPS-ECU connector terminals TSV or TSE and the torque sensor for damage or other problem.
(2) Check the wiring harness between the EPS-ECU connector terminal GND and the body ground point for damage or other problem.
Is the check result normal?
Go to Step 5.
Go to Step 8.
 
STEP 5. Voltage measurement at the EPS-ECU connector
(1) The steering is in the neutral position.
(2) Measure the EPS-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 EPS-ECU connector terminal TSV and TSE.
OK: 5 ± 0.3 V
Is the check result normal?
Go to Step 6.
Go to Step 8.
 
STEP 6. Using scan tool MB991958, check 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 9.
Go to Step 7.
 
STEP 7. Check whether the diagnostic trouble code is stored again.
(1) Erase the diagnostic trouble code.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the diagnostic trouble code is stored.
Is diagnostic trouble code C1514 or C1516 stored?
Replace the EPS-ECU (Refer to ). Then go to Step 8.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions ). Then go to Step 8.
 
STEP 8. Check whether the diagnostic trouble code is stored again.
(1) Erase the diagnostic trouble code.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the diagnostic trouble code is stored.
Is diagnostic trouble code C1514 or C1516 stored?
Replace the steering column shaft assembly (Refer to ). Then go to Step 9.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions ).
 
STEP 9. Check whether the diagnostic trouble code is stored again.
(1) Erase the diagnostic trouble code.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the diagnostic trouble code is stored.
Is diagnostic trouble code C1514 or C1516 stored?
Return to Step 1.
This diagnosis is complete.