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.
2017 Subaru WRX STIFACTORY OEM SERVICE PROCEDURE
Display Of Freeze Frame Data (OBD Mode)
NOTE:
- For detailed operation procedures, refer to "Application help".
- A list of the support data is shown in the following table.
| Display | Contents | Unit of measure |
|---|---|---|
| DTC that caused required Freeze Frame data storage | Trouble code when memorizing freeze frame data. | - |
| Fuel system for Bank 1 | Feedback status of air fuel ratio. Open: Feedback is stopped Closed: Feedback control is being performed | - |
| Load Value | Current rate of air amount. Value assuming that the air amount at the current engine speed with the throttle fully open is 100%. | % |
| Engine Coolant Temperature | Value calculated from engine coolant temperature sensor output value. | °C or °F |
| A/F Correction #1 | Air fuel ratio correction control value for the front oxygen (A/F) sensor. | % |
| A/F Learning #1 | Air fuel ratio learning control value for the front oxygen (A/F) sensor. | % |
| Intake Manifold Absolute Pressure | Value calculated from the manifold pressure sensor. | mmHg, kPa, inHg or psi |
| Engine Speed | Value calculated from crankshaft position sensor output value. | rpm |
| Vehicle Speed | Value calculated from vehicle speed sensor output value. | km/h or MPH |
| Ignition Timing Advance for #1 Cylinder | Ignition timing control value for No. 1 cylinder. Calculated from rotation speed, manifold pressure, intake air temperature, water temperature, and data from knock sensor etc. | ° |
| Intake Air Temperature | Value calculated from the intake air temperature sensor output value. | °C |
| Mass Air Flow | Value calculated from air flow sensor output value. | g/s |
| Throttle Opening Angle | Throttle valve opening angle (in percentage) calculated from throttle position sensor output value. | % |
| Secondary air system | Secondary air control status. | - |
| Oxygen sensor #12 | Rear oxygen sensor output voltage value. | V |
| Short term fuel trim #12 | Air fuel ratio correction control value of the rear oxygen sensor. | % |
| OBD System | Shows the OBD regulation to be followed. This is the information recorded in the ECM, and it does not mean that the unit automatically judges the compliance to the OBD regulations. | - |
| O2 Sensor #11 | Installation status of the front oxygen (A/F) sensor. | - |
| O2 Sensor #12 | Installation status of the rear oxygen sensor. | - |
| Time Since Engine Start | Elapsed time after starting the engine. | sec |
| Commanded Evap Purge | Evaporative purge rate displayed by the OBD. | % |
| Fuel Level | Fuel level sensor output value. Input value to ECM. Total value of main and sub. | % |
| Atmospheric Pressure | Value calculated from atmospheric pressure sensor output value. | mmHg, kPa, inHg or psig |
| ECU ACC | ECM input power supply voltage. | V |
| Absolute Load Value | Percentage of current intake air amount against the maximum air intake amount of the engine. For non-turbo engine, the value can be close to 95%, but will never be 100%. For turbo engine, this value may exceed 100% due to a boost pressure. | % |
| Target Equivalence Ratio | Target air fuel ratio. (Lambda) It usually becomes 1.0 aiming at a theoretical air fuel ratio. | - |
| Relative Throttle Position | Current throttle opening angle in percentage against the throttle voltage (full range) that has reflected the full close point learning value. The value will be approx. 70% at full open. | % |
| Ambient Temperature | Value that ECM estimates by using input values from the engine coolant temperature sensor or the intake air temperature sensor etc. | °C or °F |
| Absolute Throttle Pos.#2 | Shows the sub throttle sensor voltage value in % against the full-range 5 V throttle sensor output voltage. | % |
| Accelerator Pedal Pos.#1 | Shows the main accelerator sensor voltage value in % against the full-range 5 V throttle sensor output voltage. | % |
| Accelerator Pedal Pos.#2 | Shows the sub accelerator sensor voltage value in % against the full-range 5 V throttle sensor output voltage. | % |
| Target Throttle Opening Angle | Control value of the target throttle opening angle calculated by ECM. Target value of opening angle in percentage when 0% means fully closed and 100% means fully open. | % |
| MT gear status | Neutral condition. Information input from the neutral switch. (MT model) | - |
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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