Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2020 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Read Current Data
- On «Start» display, select «Diagnosis».
- On «Vehicle selection» display, input the vehicle information and select «Confirmed».
- On «Main Menu» display, select «Each System».
- On «Select System» display, select «Power Steering».
- On «Select Function» display, select «Data Monitor».
| Display | Contents to be displayed | Range | Unit |
|---|---|---|---|
| Torque sensor main output | Main torque sensor output voltage is displayed. | 0 - 5 | V |
| Torque sensor sub output | Sub torque sensor output voltage is displayed. | 0 - 5 | V |
| Vehicle Speed | Vehicle speed is displayed. (CAN communication data) | 0 - 255 | km/h |
| Engine Speed | Engine speed is displayed. (CAN communication data) | 0 - 12750 | RPM |
| CU Sensing Current(q) | The current flowing to the motor relay is displayed. | -128 - 127 | A |
| 3-phase motor current (U-phase) | The U phase actual current value as calculated by the microcomputer from the torque sensor input is displayed. | -128 - 127 | A |
| 3-phase motor current (V-phase) | The V phase actual current value as calculated by the microcomputer from the torque sensor input is displayed. | -128 - 127 | A |
| Motor angular speed | Data from the motor rotation angle sensor is displayed. | -4096 - 4064 | RPM |
| CU Temperature | The thermistor temperature of the steering control module is displayed. | -50 - 205 | °C |
| Power supply voltage | Battery voltage is displayed. | 0 - 25.5 | V |
| Torque sensor power supply voltage | The power supply voltage output to the torque sensor is displayed. | 0 - 10.2 | V |
| IG Voltage | The power supply voltage supplied to the ECM is displayed. | 0 - 25.5 | V |
| CAN Bus Status | Either Active/Passive/Bus Off is displayed. | - | - |
| EPS operating condition | Either Normal/Assist Stop/Assist Limitation is displayed. | - | - |
| CU Target current(q) | The motor target current value required for assist is displayed. | -128 - 127 | A |
| Steering angle | Steering angle of steering wheel is displayed. | -640 - 635 | deg |
| Overheating protection intervention history | Number of interventions to the overheat protection control (assist limitation for protecting the power steering from overheating)*1 | 0 - 250 | times |
| IG Count after ECU Overheat Protection(latest) | Number of times the ignition switch is ON from the intervention to overheat protection control (most recent) until now*2 | 0 - 65000 | times |
| IG Count after ECU Overheat Protection(Previous) | Number of times the ignition switch is ON from the intervention to overheat protection control (previous) until now*2 | 0 - 65000 | times |
| IG Count after ECU Overheat Protection(Before Previous) | Number of times the ignition switch is ON from the intervention to overheat protection control (before previous) until now*2 | 0 - 65000 | times |
| Assist limited(Abnormal voltage) | Number of interventions by the assist limit control due to voltage malfunction*1 | 0 - 250 | times |
| IGN-OFF Intervention Count while Running | Number of times the ignition switch is turned OFF while driving*1 | 0 - 250 | times |
| Motor Current | The current flowing to the motor relay is displayed. | -128 - 127 | Arms |
| Assist Map Number | Either Not Selected/MAP1/MAP2/MAP3 is displayed. | - | - |
| Assist Map Number Discord | Recorded number of the assist MAP number discordance | 0 - 250 | times |
NOTE:
- *1 When the value exceeds the maximum of 250 times, 250 is displayed.
- *2 When there is no intervention of the overheating protection control, "65535" is displayed. If an error such as control unit memory error, etc. occurs, "65534" is displayed.
- For detailed operation procedures, refer to "Application help".
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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