TORQUE SENSOR ZERO POINT CALIBRATION (USING GTS)
Note
Perform torque sensor zero point calibration if any of the following conditions occur:
The power steering ECU assembly has been replaced.
The electric power steering column sub-assembly has been replaced.
There is a difference in steering effort between turning left and right.
Perform inspection before calibration.
Turn the power switch off.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Calibrate the power steering ECU assembly. Enter the following menus: Chassis / EMPS / Data List.
Check the values by referring to the table below.
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) |
Tester Display |
---|
IG Power Supply |
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.
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.
Align the front wheels straight ahead and center the steering wheel.
Turn the power switch off.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Chassis / EMPS / Utility / Torque Sensor Adjustment.
Tester Display |
---|
Torque Sensor Adjustment |
Note
Do not turn the steering wheel sharply.
During the torque sensor zero point calibration the steering wheel will shudder. Do not touch the steering wheel until at least 3 seconds have elapsed after the shuddering has stopped.
Check for DTCs.
Note
If DTC C1515, C1516, C1534 or C1581 is output, perform troubleshooting for the corresponding DTC.
ASSIST MAP WRITING (USING GTS)
Note
Perform assist map writing if the following condition occurs:
The power steering ECU assembly has been replaced.
Turn the power switch off.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Chassis / EMPS / Utility / Signal Check.
Tester Display |
---|
Signal Check |
Tech Tips
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.
Wait for at least 5 seconds.
Check for DTCs.
Tech Tips
After writing the assist map, if DTC C1581 is output, perform the troubleshooting procedure for DTC C1581.