Displaying & Reading Trouble Codes
NOTE: This is the only information provided by the manufacturer for reading diagnostic trouble codes for this system.PRE-CHECK
1. DIAGNOSIS SYSTEM
a. Check the indicator.
When the ignition switch is turned ON, check that the PS warning light goes on for 1.5 seconds.
HINT:
- If the indicator check result is not normal, proceed to troubleshooting for the PS warning light circuit.
- When the EMPS system is faulty, the master warning light in the combination meter and the PS warning light in the multiinformation display lights up.
b. In case of not using TOYOTA hand-held tester:
Check the DTC.
1. Using SST, connect terminals Tc and CG of the DLC3.
SST 09843-18040
2. Remove the EMPS ECU with connector still connected.
3. Connect the both terminals of the 1 kOhm resistance and LED (Light Emitting Diode) circuit to terminals WL and PGND of the EMPS ECU.
4. Turn the ignition switch ON.
5. Read the DTC from the PS warning light.
HINT:
- If no code appears, inspect the diagnostic circuit and PS warning light circuit.
- As an example, the blinking patterns for normal code and codes 21 and 22 are shown on the left.
6. Codes are explained in the DTC chant.
7. After completing the check, disconnect terminals Tc and CG of the DLC3, and turn off the display. If 2 or more malfunctions are indicated at the same time, the lowest numbered DTC will be displayed first.
c. In case of using TOYOTA hand-held tester:
Check the DTC.
1. Hook up the TOYOTA hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Read the DTC by following the prompts on the tester screen.
HINT: Please refer to the TOYOTA hand-held tester operator's manual for further details.
d. In case of not using TOYOTA hand-held tester
Clear the DTC.
1. Using SST, connect terminals Ts and CG of DLC3.
SST 09843-18040
2. Turn the ignition switch ON.
3. ON and OFF the terminal CG of the DLC3 4 times or more within 8 seconds, delete DTC of the EMPS ECU.
4. Check that the PS warning light shows the normal code.
5. Remove the SST from the DLC3.
SST 09843-18040
e. In case of using TOYOTA hand-held tester
Clear the DTC.
1. Hook up the TOYOTA hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Operate the TOYOTA hand-held tester to erase the codes. (See TOYOTA hand-held tester operator's manual.)
2. CALIBRATION OF TORQUE SENSOR ZERO POINT
HINT:
Perform this operation in the following cases.
- When removing and installing "steering wheel", "tilt steering column"and "electric power steering gear".
- When replacing EMPS ECU.
a. Place front wheels and steering wheel facing straight ahead.
b. In case of using TOYOTA hand-held tester:
Perform the torque sensor zero point initialization.
HINT: If the EMPS ECU is replaced, however, this operation is not necessary.
1. Stop the vehicle.
2. Hook up the TOYOTA hand-held tester to the DLC3.
3. Select the "TRQ SENS ADJUST" mode on the TOYOTA hand-held tester.
4. Select the "ZERO POINT INITIALIZE".
5. Following the screen instructions, perform the torque sensor zero point initialization.
HINT: Please refer to the TOYOTA hand-held tester operator's manual for further details.
c. In case of not using TOYOTA hand-held tester:
Perform the torque sensor zero point initialization.
HINT: If the EMPS ECU is replaced, however, this operation is not necessary.
1. Stop the vehicle.
2. Using SST, connect terminals Ts and CG of DLC3.
SST 09843-18040
3. Using SST, connect terminals Tc and CG of DLC3.
SST 09843-18040
4. ON and OFF the terminal Tc of DLC3 20 times within 20 seconds.
5. Check that the DTC C1515/15.
d. In case of using TOYOTA hand-held tester:
Perform the torque sensor zero point calibration.
HINT: Don't touch the steering wheel.
1. Select the "TRQ SENS ADJUST" mode on the TOYOTA hand-held tester.
2. Select the "ZERO POINT ADJUST".
3. Following the screen instructions, perform the torque sensor zero point calibration.
HINT: Please refer to the TOYOTA hand-held tester operator's manual for further details.
e. In case of not using TOYOTA hand-held tester:
Perform the torque sensor zero point calibration.
HINT:
- Don't touch the steering wheel.
- Check the DTC except C1515/15 is not output.
1. Stop the vehicle and turn the ignition switch OFF.
2. Using SST, connect terminals Ts and CG of DLC3 and ignition switch ON.
SST 09843-18040
3. Disconnect the SST.
SST 09843-18040