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.
2010 Lexus GS 350 AWDFACTORY OEM SERVICE PROCEDURE
Freeze Frame Data
- DESCRIPTION
- 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 engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
HINT:
If it is impossible to replicate the problem even though a DTC is detected, confirm the freeze frame data.
- The ECM records engine conditions in the form of freeze frame data every 0.5 seconds. Using the Techstream, five separate sets of freeze frame data, including the data values at the time when the DTC was set, can be checked.
- 3 data sets before the DTC was set.
- 1 data set when the DTC was set.
- 1 data set after the DTC was set.
- These data sets can be used to simulate the condition of the vehicle around the time of the occurrence of the malfunction. The data may assist in identifying of the cause of the malfunction, and in judging whether it was temporary or not.
- 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 engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
- LIST OF FREEZE FRAME DATA
LABEL
(Techstream Display)Measurement Item Diagnostic Note Trouble Code Freeze DTC - Vehicle Speed Vehicle speed Speed indicated on speedometer Engine Speed Engine speed - Calculate Load Calculated load Calculated load by ECM Vehicle Load Vehicle load - MAF Mass air flow volume If value approximately 0.0 gm/s.: - Mass air flow meter power source circuit open or shorted
- VG circuit open or shorted
If value 271.0 gm/s. or more:- E2G circuit open
Atmosphere Pressure Atmospheric pressure - Coolant Temp Engine coolant temperature If value -40°C (-40°F), sensor circuit open
If value 140°C (284°F) or higher, sensor circuit shortedIntake Air Intake air temperature If value -40°C (-40°F), sensor circuit open
If value 140°C (284°F) or higher, sensor circuit shortedAmbient Temperature Ambient temperature - Engine Run Time Accumulated engine running time - Initial Engine Coolant Temp Initial engine coolant temperature - Initial Intake Air Temp Initial intake air temperature - 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 - Fuel Press Fuel Pressure - Injector (Port) Injection period of No. 1 cylinder - Injection Volume (Cylinder 1) Injection volume - Fuel Pump Speed Control Fuel pump speed control status - Fuel Pump/Speed Status Fuel pump/speed status - Vacuum Pump Key-off EVAP system leak detection pump status - Combustion Status (D4) Combustion status (D4) - Fuel Pressure Target Value Target fuel pressure - Fuel Pump Duty (D4) Fuel pump duty (D4) - HP FP Discharge Rate High pressure fuel pump discharge rate - Injection Way Injection mode - Injection Switching Status Prohibition of changing the D-4S injection method - Injection Timing (D4) Injection timing (D4) - Injection Time (D4) Injection time (D4) - EVAP (Purge) VSV Purge VSV duty ratio - EVAP Purge Flow Purge flow - Purge Density Learn Value Learning value of purge density - EVAP System Vent Valve Key-off EVAP system vent valve status - EVAP Purge VSV Purge VSV - Purge Cut VSV Duty Purge cut VSV duty - Target Air-Fuel Ratio Air-fuel ratio - AF Lambda B1S1 Fuel trim at A/F sensor - AF Lambda B2S1 Fuel trim at A/F sensor - AFS Voltage B1 S1 A/F sensor output - AFS Voltage B2 S1 A/F sensor output - AFS Current B1 S1 A/F sensor current (bank 1 sensor 1) - AFS Current B2 S1 A/F sensor current (bank 2 sensor 1) - O2S B1 S2 Heated oxygen sensor output - O2S B2 S2 Heated oxygen sensor output - O2S Impedance B1 S2 Sub heated oxygen sensor impedance - O2S Impedance B2 S2 Sub heated oxygen sensor impedance - O2 Heater B1S2 Heated oxygen sensor heater - O2 Heater B2S2 Heated oxygen sensor heater - O2 Heater Curr Val B1S2 Heated oxygen sensor current - O2 Heater Curr Val B2S2 Heated oxygen sensor current - 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 a continual deviation of short-term fuel trim from central valve Total FT #1 Total fuel trim - Short FT #2 Short-term fuel trim Short-term fuel compensation used to maintain air-fuel ratio at stoichiometric air-fuel ratio Long FT #2 Long-term fuel trim Overall fuel compensation carried out in long-term to compensate a continual deviation of short-term fuel trim from central valve Total FT #2 Total fuel trim - Fuel System Status #1 Fuel system status (Bank 1) - OL (Open Loop): Has not yet satisfied conditions to go closed loop
- CL (Closed Loop): Using heated oxygen sensor as feedback for fuel control
- OLDrive: Open loop due to driving conditions (fuel enrichment)
- OLFault: Open loop due to detected system fault
- CLFault: Closed loop but heated oxygen sensor, which used for fuel control malfunctioning
Fuel system status #2 Fuel system status (Bank 2) - OL (Open Loop): Has not yet satisfied conditions to go closed loop
- CL (Closed Loop): Using heated oxygen sensor as feedback for fuel control
- OLDrive: Open loop due to driving conditions (fuel enrichment)
- OLFault: Open loop due to detected system fault
- CLFault: Closed loop but heated oxygen sensor, which 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 - VVT Control Status #1 VVT control status (bank 1) - VVT Control Status #2 VVT control status (bank 2) - Catalyst Temp (B1 S1) Catalyst temperature - Catalyst Temp (B2 S1) Catalyst temperature - Catalyst Temp (B1 S2) Catalyst temperature - Catalyst Temp (B2 S2) Catalyst temperature - Starter Signal Starter signal - Starter Control Starter control - Power Steering Signal Power steering signal - Starter Relay Starter relay status - ACC Relay ACC CUT relay status - Neutral Position SW Signal PNP switch signal - Stop Light Switch Stop light switch status - A/C Signal A/C signal - Idle Up Signal Idle up signal - Closed Throttle Position SW Closed throttle position switch - Fuel Cut Condition Fuel cut condition ON or OFF - Immobiliser Communication Immobiliser communication ON or OFF - Engine Oil Pressure SW Engine oil pressure switch signal Always ON while engine is running TC Terminal TC terminal status - Time after DTC Cleared Cumulative time after DTC cleared - Distance from DTC Cleared Accumulated distance after DTC cleared - Warmup Cycle Cleared DTC Warm-up cycle after DTC cleared - Dist Batt Cable Disconnect Accumulated distance from battery cable disconnected - IG OFF Elapsed Time Cumulative time after engine switch off - TC and TE1 TC and TE1 terminals of DLC3 - Ignition Trig. Count Ignition - 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 - Cylinder #5 Misfire Count Cylinder #5 misfire count - Cylinder #6 Misfire Count Cylinder #6 misfire count - All Cylinders Misfire Count All cylinder misfire count - Misfire RPM Misfire RPM - Misfire Load Misfired load - Catalyst OT MF F/C Catalyst over temperature misfire prevention F/C - Cat OT MF F/C History Catalyst over temperature misfire prevention F/C not available - Cat OT MF F/C Cylinder#1 Catalyst over temperature misfire prevention F/C history OFF - Cat OT MF F/C Cylinder#2 Catalyst over temperature misfire prevention F/C history OFF - Cat OT MF F/C Cylinder#3 Catalyst over temperature misfire prevention F/C history OFF - Cat OT MF F/C Cylinder#4 Catalyst over temperature misfire prevention F/C history OFF - Cat OT MF F/C Cylinder#5 Catalyst over temperature misfire prevention F/C history OFF - Cat OT MF F/C Cylinder#6 Catalyst over temperature misfire prevention F/C history OFF - Electric Fan Motor Electric fan motor status - Idle Fuel Cut Prohibit Prohibition of fuel cut at idle - A/C Magnetic Clutch Relay A/C magnetic clutch relay - Idle Fuel Cut Idle fuel cut ON: when throttle valve fully closed and engine speed over 2500 RPM FC TAU Fuel cut during very light load Fuel cut being performed under very light load to prevent engine combustion from becoming incomplete Electrical Load Signal 1 Electrical load signal - Electrical Load Signal 2 Electrical load signal - Electrical Load Signal 3 Electrical load signal - Electrical Load Signal 4 Electrical load signal - Key Unlock Signal Unlock signal - Received MIL from ECT MIL status from TCM - Shift Position Sig from ECT Shift position signal from TCM - A/T Oil Temp from ECT ATF temperature from TCM - SPD (NO) Output shaft speed - SPD (NT) Input shaft speed - ECT Lock Up ECT lock up status -
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.