Display Of Engine Freeze Frame Data
NOTE:
- ECM updates the freeze frame data every 0.5 seconds, and always keeps the last three records. Time-series freeze frame data includes the last three freeze frame data and the freeze frame data when the DTC is detected.
- In the time-series freeze frame data, the following freeze frame data are displayed: Detect, History1, History2 and History3.
- Time lag between the freeze frame data of Detect and the freeze frame data of History1 changes within the range of 0 - 0.5 seconds. This is because the freeze frame data of Detect is recorded when the DTC is actually detected, while the freeze frame data of History1 is updated every 0.5 seconds.
- When more than one DTCs are recorded, the time-series freeze frame data is recorded only for the first-detected DTC, and for the next DTC, just the freeze frame data of Detect is recorded. And for the subsequent DTCs, no freeze frame data is recorded.
- When performing diagnosis, you can utilize the time-series freeze frame data to guess the vehicle status when the DTC was detected.
- For detailed operation procedures, refer to "PC application help for Subaru Select Monitor".
- A list of the support data is shown in the following table.
| Item | Content | Remarks |
|---|---|---|
| Engine Speed | Calculated from crankshaft position sensor signal. | rpm |
| Mass Air Flow | Amount of intake air calculated from air flow sensor output value. | g/s |
| Vehicle Speed | Value calculated from vehicle speed sensor output value. | km/h or MPH |
| Throttle Opening Angle | Throttle valve opening angle (in percentage) calculated from throttle position sensor output value. | % |
| Ignition timing adv. #1 | Ignition timing control value for No. 1 cylinder. Calculated from rotation speed, intake manifold pressure, intake air temperature, water temperature, and data from knock sensor etc. | ° |
| Coolant Temp. | Engine coolant temperature signal. | °C or °F |
| Short term fuel trim B1 | Main correction value of A/F feedback control. | % |
| Long term fuel trim B1 | Main learning value of A/F feedback control. | % |
| Mani. Absolute Pressure | Value calculated from the intake manifold pressure sensor output. | kPa, mmHg, inHg or psig |
| Oxygen sensor #12 | Voltage value of rear oxygen sensor. | V |
| Control module voltage | ECM input power supply voltage. | V |
| Target Equivalence Ratio | Target air fuel ratio. (Lambda) It usually becomes 1.0 aiming at a theoretical air fuel ratio. | - |
| Intake Air Temp. | Intake air temperature calculated from intake air temperature sensor output value. | °C or °F |
| Ambient Temperature | Ambient temperature that ECM estimates by input values from the engine coolant temperature sensor or the intake air temperature sensor etc. | °C or °F |
| Ambient Temperature Sensor Signal | Data value of the ambient air input from the combination meter via CAN. Ambient temperature used for diagnosis. | °C or °F |
| Calculated 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%. | % |
| 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. |
% |
| Atmosphere Pressure | Atmospheric pressure calculated from atmospheric pressure sensor output value. | kPa, mmHg, inHg or psig |
| Actual Throttle Opening Angle | Actual throttle opening angle. Calculated by ECM based on the throttle sensor input value. | deg |
| Target Throttle Act. Cont. | Control value of the target throttle opening angle calculated by ECM. Shows the target value of opening angle in percentage when 0% means fully closed and 100% means fully open. | % |
| Relative Throttle Pos. | 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. | % |
| Fuel Level | Fuel level sensor output value. ECM input value. Total value of main and sub. |
% |
| Commanded Evap Purge | Evaporative purge rate displayed by the OBD. | % |
| Fuel system for Bank 1 | Feedback status of air fuel ratio. Open: Feedback is stopped Closed: Feedback control is being performed |
- |
| Commanded EGR | EGR setting value is calculated by ECM and the target value is displayed. | % |
| EGR Error | Displays a difference (%) between the target EGR steps and the actual EGR steps. When the value is positive, it opens more than the target value. When the value is negative, it does not reach to the target value. |
% |
| Ignition SW ON Count | Time stamp information. Number of times the ignition is ON since the vehicle was manufactured. The number of ignition ON is also recorded when a trouble code is recorded, so the comparison with that number will show you how many times the ignition has turned on since the diagnostic code was recorded. |
Time |
| Count | Time stamp information. Each unit individually counts the elapsed time since the ignition is turned to ON. Master integrated unit and ECM synchronize with the master time. When synchronized: "Common" When not synchronized: "Originally" |
- |
| Time Count | Time stamp information. Elapsed time after ignition ON. When a trouble code is recorded, the elapsed time after ignition ON is also recorded. |
ms |
| Time Since Engine Start | Elapsed time after starting the engine. Displays the elapsed time after engine start based on the OBD regulations. | sec |
| AT drive status | Neutral condition. Information input from the inhibitor switch. (CVT model) |
- |
| MT gear status | Information input from the neutral switch. (MT model) | - |
| X mode | Shows X mode ON or OFF status. | - |
| O2 Sensor #11 | Installation status of the front oxygen sensor. | - |
| O2 Sensor #12 | Installation status of the rear oxygen sensor. | - |
| Short term fuel trim #12 | Air fuel ratio correction control value for the rear. | % |
| 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. | % |
| Accelerator Pedal Pos.#2 | Shows the sub accelerator sensor voltage value in % against the full-range 5 V. | % |
| 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. |
- |