POWER STEERING SYSTEM CALIBRATION

TORQUE SENSOR ZERO POINT CALIBRATION (USING GTS)

1. Perform inspection before calibration.

   
   

   1. Turn the power switch off.

   2. Connect the GTS to the DLC3.

   3. Turn the power switch on (IG).

   4. Turn the GTS on.

   5. Calibrate the power steering ECU assembly. Enter the following menus: Chassis / EMPS / Data List.

   6. Check the values by referring to the table below.

      Table 1. EMPS

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      IG Power Supply	IG power source voltage/ Min.: 0.0000 V Max.: 20.1531 V	8 to 16 V	Power switch on (IG)

      Standard Voltage
      8 to 16 V

      Note:

      If the IG power supply voltage is 8 V or less, calibration cannot be performed. In this case, charge or replace the auxiliary battery, and then perform calibration.

2. Perform torque sensor zero point calibration.

   Note:

   If DTC C1516 (Torque Sensor Zero Point Adjustment Incomplete) is stored, the torque sensor zero point cannot be calibrated. Clear the DTCs before starting calibration.

   
   

   1. Set the steering wheel to the center point and align the front wheels straight ahead.

   2. Turn the power switch off.

   3. Connect the GTS to the DLC3.

   4. Turn the power switch on (IG).

   5. Turn the GTS on.

   6. Enter the following menus: Chassis / EMPS / Utility / Torque Sensor Adjustment.

      Note:
      

      • Do not turn the steering wheel sharply.

      • Do not touch the steering wheel during torque sensor zero point calibration (for 3 seconds).

   7. Check for DTCs (Click here).

      Note:

      If DTC C1515, C1516, C1534 or C1581 is output, perform troubleshooting for the corresponding DTC.

      Result
      Result See Procedure DTC C1515 is output. Click here DTC C1516 is output. Click here DTC C1534 is output. Click here DTC C1581 is output. Click here

TORQUE SENSOR ZERO POINT CALIBRATION (USING SST CHECK WIRE)

1. Check for DTCs.

   
   

   1. Check for DTCs (Click here).

      Note:
      

      • If DTC C1516 (Torque Sensor Zero Point Adjustment Incomplete) is stored, the torque sensor zero point cannot be calibrated. Clear the DTCs before starting calibration.

      • If DTCs other than C1516 are output, refer to the Diagnostic Trouble Code Chart (Click here).

2. Perform pre-calibration check.

   
   

   1. Turn the power switch off.

   2. Disconnect the c1 power steering ECU assembly connector.

   3. Turn the power switch on (IG).

   4. 

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition c1-1 (IG) - Body ground Power switch on (IG) 8 to 16 V

      Note:

      If the IG power supply voltage is 8 V or less, calibration cannot be performed. In this case, charge or replace the auxiliary battery, and then perform calibration.

   5. Turn the power switch off.

   6. Reconnect the c1 power steering ECU assembly connector.

      Table 2. Text in Illustration

      *a	Front view of wire harness connector (to Power Steering ECU Assembly)

3. Clear sensor calibration value.

   
   

   1. Set the steering wheel to the center point and align the front tires straight ahead.

   2. Turn the power switch off.

   3. 

      Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

      09843-18040

      Note:

      Connect the terminals to the correct positions to avoid a malfunction.

      Table 3. Text in Illustration

      *1

      DLC3

   4. Turn the power switch on (IG) and then connect and disconnect terminals 13 (TC) and 4 (CG) at least 20 times in 20 seconds.

   5. 

      Check that the EPS warning light blinks and then remains illuminated.

      Tip:

      The EPS warning light illumination indicates that DTC C1515 has been stored.

   6. Turn the power switch off.

      Note:

      After erasing the sensor calibration value, zero point calibration cannot be performed if the power switch is on (IG).

      Table 4. Text in Illustration

      *1	EPS Warning Light

4. Perform torque sensor zero point calibration.

   Note:

   As torque sensor zero point calibration cannot be performed if DTC C1515 has not been stored, be sure to perform sensor calibration value erasure before performing torque sensor zero point calibration.

   
   

   1. Set the steering wheel to the center point and align the front tires straight ahead.

   2. Turn the power switch off.

   3. 

      Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

      09843-18040

      Table 5. Text in Illustration

      *1

      DLC3

   4. Turn the power switch on (IG) and then connect terminals 13 (TC) and 4 (CG).

      Note:

      Do not touch the steering wheel during calibration (for 3 seconds).

      Tip:

      The EPS warning light remains illuminated even after calibration has completed.

ASSIST MAP WRITING (USING GTS)

1. Turn the power switch off.

2. Connect the GTS to the DLC3.

3. Turn the power switch on (IG).

4. Turn the GTS on.

5. Enter the following menus: Chassis / EMPS / Utility / Signal Check.

   Tip:
   

   • Follow the instructions on the GTS to perform Signal Check.

   • With DTC C1581 output, performing Signal Check will cause the power steering ECU assembly to enter Signal Check and the assist map will be written automatically.

6. Wait for at least 5 seconds.

7. Check for DTCs (Click here).

   Tip:

   After writing the assist map, if DTC C1581 is output, perform the troubleshooting procedure for DTC C1581 (Click here).

ASSIST MAP WRITING (USING SST CHECK WIRE)

1. 

   Turn the power switch off.

   Table 6. Text in Illustration

   *1

   DLC3

2. Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

   09843-18040

   Note:

   Connect the terminals correctly to avoid a malfunction.

3. Turn the power switch on (IG).

4. Wait for 5 seconds or more.

5. Check for DTCs (Click here).

   Tip:

   After writing the assist map, if DTC C1581 is output, perform the troubleshooting procedure for DTC C1581 (Click here).