SFI SYSTEM FREEZE FRAME DATA
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DESCRIPTION
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The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the air fuel ratio was lean or rich, as well as the other data recorded at the time of a malfunction.
Tech Tips
If it is impossible to duplicate the problem even though a DTC is detected, confirm the freeze frame data.
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The ECM records engine conditions in the form of freeze frame data every 0.5 seconds. Using the intelligent tester, 5 separate sets of freeze frame data can be checked.
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3 data sets before the DTC was set.
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1 data set when the DTC was set.
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1 data set after the DTC was set.
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These data sets can be used to duplicate the condition of the vehicle around the time of the occurrence of the malfunction. The data may assist in identifying the cause of the malfunction, and in judging whether it was temporary or not.
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LIST OF FREEZE FRAME DATA
Tester Display Measurement Item Diagnostic Note Vehicle Speed Vehicle speed Speed indicated on speedometer Engine Speed Engine speed - Calculate Load Calculated load Calculated load by ECM Vehicle Load Vehicle load Load percentage in terms of maximum intake air flow amount MAF Mass air flow volume If approximately 0.0 gm/sec:
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Mass air flow meter power source circuit open
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VG circuit open or short
If value 271.0 gm/sec or more:
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E2G circuit open
Atmosphere Pressure Atmospheric pressure - MAP Intake manifold pressure - Coolant Temp Engine coolant temperature If -40°C (-40°F), sensor circuit open
If 140°C (284°F), sensor circuit shorted
Intake Air Intake air temperature If -40°C (-40°F), sensor circuit open
If 140°C (284°F), sensor circuit shorted
Ambient Temperature Ambient temperature - Engine Run Time Accumulated engine running time - Initial Engine Coolant Temp Engine coolant temperature at engine start - Initial Intake Air Temp Intake air temperature at engine start - Battery Voltage Battery voltage - Accel Sens. No. 1 Volt % Absolute accelerator pedal position No. 1 - Accel Sens. No. 2 Volt % Absolute accelerator pedal position No. 2 - Throttle Sensor Volt % Throttle position - Throttle Sensor #2 Volt % Throttle sensor positioning #2 - Throttle Sensor Position Throttle sensor positioning - Throttle Motor DUTY Throttle actuator - Throttle Position Throttle valve opening angle Reference:
When the engine stalls, is difficult to start, or idles roughly
ISC Flow Flow rate calculated from information from each sensor Reference:
When the engine stalls, is difficult to start, or idles roughly
ISC Position Target valve opening angle calculated from ISC control Reference:
When the engine stalls, is difficult to start, or idles roughly
ISC Feedback Value ISC feedback value Reference:
When the engine stalls, is difficult to start, or idles roughly
ISC Learning Value ISC learning value Reference:
When the engine stalls, is difficult to start, or idles roughly
Electric Load Feedback Val Electrical load feedback value Reference:
When the engine stalls, is difficult to start, or idles roughly
Air Conditioner FB Val Air conditioner load feedback value Reference:
When the engine stalls, is difficult to start, or idles roughly
Low Revolution Control Status of low engine speed control Reference:
When the engine stalls, is difficult to start, or idles roughly
Neutral Control N position control status for automatic transaxle Reference:
When the engine stalls, is difficult to start, or idles roughly
N Range Status Judgement for shift lever N position Reference:
When the engine stalls, is difficult to start, or idles roughly
Eng Stall Control FB Flow Feedback value of intake air flow Reference:
When the engine stalls, is difficult to start, or idles roughly
Deposit Loss Flow Deposit loss air flow rate Reference:
When the engine stalls, is difficult to start, or idles roughly
Injector (Port) Injection period of No. 1 cylinder - Injection Volume (Cylinder 1) Injection volume - Fuel Pump/Speed Status Fuel pump/speed status - EVAP (Purge) VSV Purge valve duty ratio - Evap Purge Flow Ratio of evaporative purge flow to intake air volume - Purge Density Learn Value Learning value of purge density - EVAP Purge VSV Purge valve - Target Air-Fuel Ratio Ratio compared to stoichiometric level - AF Lambda B1S1 Fuel trim at air fuel ratio sensor - AFS Voltage B1S1 Air fuel ratio sensor (bank 1 sensor 1) output Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check output voltage of sensor AFS Current B1S1 Air fuel ratio sensor output current - O2S B1S2 Heated oxygen sensor (bank 1 sensor 2) output Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check output voltage of sensor Short FT #1 Short-term fuel trim Short-term fuel compensation used to maintain air fuel ratio at stoichiometric air fuel ratio Long FT #1 Long-term fuel trim Overall fuel compensation carried out in long-term to compensate for a continual deviation of short-term fuel trim from central value Total FT #1 Total fuel trim - Fuel System Status #1 Fuel system status (bank 1)
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OL (Open Loop): Has not yet satisfied conditions to go closed loop
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CL (Closed Loop): Using air fuel ratio sensor as feedback for fuel control
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OLDrive: Open loop due to driving conditions (fuel enrichment)
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OLFault: Open loop due to detected system fault
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CLFault: Closed loop but air fuel ratio sensor, which is used for fuel control, malfunctioning
IGN Advance Ignition advance - Knock Feedback Value Feedback value of knocking - Knock Correct Learn Value Correction learning value of knocking - Idle Spark Advn Ctrl #1 Ignition timing advance value (for No. 1 cylinder) Reference:
When the engine stalls, is difficult to start, or idles roughly
Idle Spark Advn Ctrl #2 Ignition timing advance value (for No. 2 cylinder) Reference:
When the engine stalls, is difficult to start, or idles roughly
Idle Spark Advn Ctrl #3 Ignition timing advance value (for No. 3 cylinder) Reference:
When the engine stalls, is difficult to start, or idles roughly
Idle Spark Advn Ctrl #4 Ignition timing advance value (for No. 4 cylinder) Reference:
When the engine stalls, is difficult to start, or idles roughly
Target EGR Position Target EGR position - EGR Step Position EGR step position - VVT Control Status #1 VVT control status (bank 1) - VVT Advance Fail Status of VVT advance fail - Catalyst Temp B1S1 Estimated catalyst temperature (bank 1 sensor 1) - Catalyst Temp B1S2 Estimated catalyst temperature (bank 1 sensor 2) - Starter Signal Starter switch (STSW) signal - Power Steering Signal Power steering signal - Power Steer. Sig. Record Power steering signal (history) Signal status usually ON until ignition switch is turned off Neutral Position SW Signal Clutch pedal switch signal - Clutch Switch*1 Clutch Switch - Reverse Switch*1 Reverse Switch - Stop Light Switch Stop light switch - Shift Indication Enable*1 Shift Indication Enable - A/C Signal Air conditioning signal - Closed Throttle Position SW Closed throttle position switch - Fuel Cut Condition Fuel cut condition - Immobiliser Communication Immobiliser communication - Electrical Load Signal Electrical load signal - Time after DTC Cleared Cumulative time after DTC cleared - Distance from DTC Cleared Accumulated distance after DTC cleared - Warmup Cycle Cleared DTC Warm-up cycles since DTCs cleared Number of warm-up cycles since DTCs cleared TC and TE1 TC and TE1 terminals of DLC3 - Ignition Trig. Count Ignition counter - Cylinder #1 Misfire Count Cylinder #1 misfire count - Cylinder #2 Misfire Count Cylinder #2 misfire count - Cylinder #3 Misfire Count Cylinder #3 misfire count - Cylinder #4 Misfire Count Cylinder #4 misfire count - All Cylinders Misfire Count All cylinder misfire count - Misfire RPM Engine speed when misfire occurs - Misfire Load Engine load when misfire occurs - Misfire Margin Margin to detect engine misfire - Engine Starting Time Time elapsed before engine starts (after starter turns on until engine speed reaches 400 rpm) Reference:
When the engine stalls, is difficult to start, or idles roughly
Engine Speed (Starter Off) Engine speed when starter off Reference:
When the engine stalls, is difficult to start, or idles roughly
Starter Count Number of times starter turned on after ignition switch turned from off to ON Reference:
When the engine stalls, is difficult to start, or idles roughly
Run Dist of Previous Trip Distance traveled during previous trip Before 5 seconds elapse after starting the engine, which is DTC P1604 (Startability Malfunction) detection duration, this parameter indicates the distance driven during the previous trip.
After 5 seconds elapse after starting the engine, this parameter indicates the distance driven during the current trip calculated from the vehicle speed signal.
Tech Tips
Run Dist of Previous Trip in freeze frame data which were present when the startability malfunction occurred (DTC P1604 detected) indicates the distance driven during the previous trip, but in all other cases, such as for the snapshot data of Data List (real-time measurements), or for freeze frame data which were present when the DTCs other than P1604 were detected, the value indicates the distance driven during the current trip.
Previous Trip Coolant Temp Coolant temperature of previous trip Reference:
When the engine stalls, is difficult to start, or idles roughly
Previous Trip Intake Temp Intake air temperature of previous trip Reference:
When the engine stalls, is difficult to start, or idles roughly
Engine Oil Temperature Engine oil temperature (estimated) Reference:
When the engine stalls, is difficult to start, or idles roughly
Previous Trip Eng Oil Temp Engine oil temperature of previous trip Reference:
When the engine stalls, is difficult to start, or idles roughly
Ambient Temp for A/C Ambient temperature Reference:
When the engine stalls, is difficult to start, or idles roughly
Previous Trip Ambient Temp Ambient temperature of previous trip Reference:
When the engine stalls, is difficult to start, or idles roughly
Engine Start Hesitation History of instances of slow engine starts - Low Rev for Eng Start History of low engine speed after engine starts - Minimum Engine Speed Minimum engine speed Reference:
When the engine stalls, is difficult to start, or idles roughly
Fuel Cut Elps Time Time elapsed after high engine speed detected Time after the ECM detects a high engine speed (fuel cut speed + 500 rpm or more) Electric Fan Motor Electric fan motor - Idle Fuel Cut Idle fuel cut ON: when throttle valve fully closed and engine speed over 2500 rpm FC TAU Fuel cut with very light load Fuel cut being performed with very light load to prevent incomplete engine combustion Immobiliser Fuel Cut Status of the immobiliser fuel cut - MT Down Shift Indication*1 MT Down Shift Indication - MT Up Shift Indication*1 MT Up Shift Indication -
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*1: for Manual Transaxle
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