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 | Description | 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 or lb/m |
| 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 |
| VVT Advance Target Angle Amount R |
AVCS target advance angle amount for the RH bank on the intake side. This value is compared with the AVCS advance angle amount R to judge if the intake AVCS is operating properly. Response delays during the transition time. |
deg |
| VVT Advance Target Angle Amount L |
AVCS target advance angle amount for the LH bank on the intake side. This value is compared with the AVCS advance angle amount L to judge if the intake AVCS is operating properly. Response delays during the transition time. |
deg |
| 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. |
- |
| IAT Sensor #11 | Intake air temperature calculated from the intake air temperature sensor output at the air flow sensor section. | °C or °F |
| IAT Sensor #12 | Intake air temperature calculated from the intake air temperature sensor output at the intake manifold pressure sensor section. | °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 |
| 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 Opening Angle | 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. 80% at full open. | % |
| Idle Mass Air Flow | Air volume correction value to maintain the target rotation speed in each water temperature. Corrects air volume when the water temperature changes. It includes values of the feedback correction amount and the learning value. |
g/s |
| Idle Mass Air Flow Feedback correct | Air volume compensation value of ISC as a feedback correction to stabilize the idling speed. | g/s |
| ISC Learning Value | Learning control value of ISC. After warming up, learning control is executed to reduce the ISC feedback correction to zero, in order to stabilize the engine speed. |
g/s |
| Idle A/C load correct | Air volume correction when the air conditioner is turned on. ECM corrects the air volume against the set target rotation speed when the air conditioner is turned ON. |
g/s |
| Idle dirty throttle correct | Calculates the ISC learning values on a long-term basis, and judges as an ISC dirty throttle correction when the learning value increases gradually. When carbon or other dirt accumulates on the ISC throttle and make the throttle dirty, air volume decreases when the throttle is fully closed. The ECM increases the amount of compensation air to keep the rotation speed. |
g/s |
| Fuel Rail Pressure A | Fuel pressure sensor output value set to the high pressure fuel line. Output value to ECM. | kPa, mmHg, inHg or psig |
| Commanded Fuel Rail Pressure A | Target fuel pressure for high pressure fuel line calculated by ECM. | kPa, mmHg, inHg or psig |
| Fuel Level | Fuel level sensor output value. ECM input value. Total value of main and sub. |
% |
| Evap Purge | Evaporative purge rate displayed by the OBD. | % |
| Purge Density Learn Value | Leaning value of the evaporation gas density purged from the canister. ECM displays the estimated leaning value. |
% |
| Evap Purge Flow | Purge ratio when the evaporation gas is purged from the canister. ECM performs a DUTY drive to the purge solenoid valve. The amount of gas actually purged will vary depending on the vacuum pressure difference before/after the solenoid valve. Purge ratio displayed here shows current purge amount in percentage against the maximum purge amount when the maximum vacuum pressure is applied. |
% |
| 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. |
% |
| Trip 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 |
| Initial Engine Oil Temp. | Oil temperature when starting the engine, which is input to ECM from the oil temperature sensor. | °C |
| Initial Engine Coolant Temp. | Water temperature when starting the engine, which is input to ECM from the water temperature sensor. | °C |
| Initial Intake Air Temp. | Intake air temperature when starting the engine, which is input to ECM from the intake air temperature sensor. | °C |
| Engine Starting Time | Time needed since the cranking started till the judgment of engine start is complete. | ms |
| IG OFF Elapsed Time | The time the vehicle has been left since the engine stopped. This value can be used to check how long the vehicle has been left with the ignition switch ON after the engine stopped. |
sec |
| AT drive status | Neutral condition. Information input from the inhibitor switch. (CVT model) Information input from the neutral switch. (MT model) |
- |
| X mode | Shows X mode ON or OFF status. | - |
| SI Drive mode (Display) | SI-DRIVE mode status. ECM output value. Displayed only on models with SI-DRIVE. |
- |
| AT turbine speed | Turbine rotation speed of the transmission. Turbine rotation speed is input from the transmission CONTROL MODULE via CAN. |
- |
| Lock up status | Lock-up status of the transmission. Lock up status is input from the transmission CONTROL MODULE via CAN. |
- |
| P/N Signal | P/N status of the transmission. P/N range status is input from the transmission CONTROL MODULE via CAN. |
- |
| Oxygen sensor #11 | Installation status of the front oxygen sensor. | - |
| Oxygen 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. |
- |