Lexus NX: Freeze Frame Data

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 moving or stationary, 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, 5 separate sets of freeze frame data can be checked.

  • 3 data sets before the DTC was stored.
  • 1 data set when the DTC was stored.
  • 1 data set after the DTC was stored.

These data sets can be used to simulate the condition of the vehicle around the time of the occurrence the malfunction. The data may assist in identifying the cause of the malfunction, and judging whether it was temporary or not.

PENDING FREEZE FRAME DATA

HINT:

Pending freeze frame data is stored when a 2 trip DTC is first detected during the first trip.

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

(e) Select a DTC in order to display its pending freeze frame data.

HINT:

  • Pending freeze frame data is cleared when any of the following occurs.
    • Using the Techstream, the DTCs cleared.
    • The cable is disconnected from the negative (-) auxiliary battery terminal.
    • 40 trips with the engine fully warmed up have been performed after returning to normal. (Pending freeze frame data will not be cleared by only returning the system to normal.)
  • With previous pending freeze frame data stored, if pending freeze frame data is newly stored when a 2 trip DTC is detected in the first trip, the old freeze frame data will be replaced with the new data of the newly detected DTC in the next trip.

LIST OF FREEZE FRAME DATA

Powertrain > Engine and ECT

Tester Display

Vehicle Speed

Engine Speed

Calculate Load

Vehicle Load

MAF

Atmosphere Pressure

MAP

Coolant Temp

Intake Air

Ambient Temperature

Engine Run Time

Initial Engine Coolant Temp

Coolant Temp Variation after Waterpump Start

Initial Intake Air Temp

Intake Air Temp Variation after Engine Start

Battery Voltage

Throttle Sensor Volt %

Throttle Sensor #2 Volt %

Throttle Sensor Position

Throttle Motor DUTY

Throttle Position

ISC Flow

ISC Position

ISC Feedback Value

ISC Learning Value

Electric Load Feedback Val

Air Conditioner FB Val

Low Revolution Control

Deposit Loss Flow

Fuel Pump Duty

Injector (Port)

Injection Volum (Cylinder1)

Vacuum Pump

Current Fuel Type

EVAP (Purge) VSV

Evap Purge Flow

Purge Density Learn Value

EVAP System Vent Valve

EVAP Purge VSV

Purge Cut VSV Duty

Target Air-Fuel Ratio

AF Lambda B1S1

AFS Voltage B1S1

AFS Current B1S1

A/F Heater Duty B1S1

O2S B1S2

O2S Impedance B1S2

O2 Heater B1S2

O2 Heater Curr Val B1S2

Short FT B1S1

Short FT B1S2

Long FT B1S1

Long FT B1S2

Total FT #1

Fuel System Status #1

Fuel System Status #2

IGN Advance

Knock Feedback Value

Knock Correct Learn Value

Idle Spark Advn Ctrl #1

Idle Spark Advn Ctrl #2

Idle Spark Advn Ctrl #3

Idle Spark Advn Ctrl #4

Target EGR Position

EGR Step Position

Actual VVT Angle #1

VVT Control Status #1

VVT Advance Fail

Catalyst Temp B1S1

Catalyst Temp B1S2

Closed Throttle Position SW

Fuel Cut Condition

Time after DTC Cleared

Distance from DTC Cleared

Warmup Cycle Cleared DTC

Dist Batt Cable Disconnect

IG OFF Elapsed Time

TC and TE1

Total Distance Traveled

Ignition Trig. Count

Cylinder #1 Misfire Count

Cylinder #2 Misfire Count

Cylinder #3 Misfire Count

Cylinder #4 Misfire Count

All Cylinders Misfire Count

Misfire RPM

Misfire Load

Misfire Margin

Engine Speed (Starter Off)

Starter Count

Run Dist of Previous Trip

Engine Starting Time

Previous Trip Coolant Temp

Previous Trip Intake Temp

Engine Oil Temperature

Previous Trip Eng Oil Temp

Ambient Temp for A/C

Previous Trip Ambient Temp

Engine Start Hesitation

Low Rev for Eng Start

Minimum Engine Speed

A/F Learn Value Idle #1

A/F Learn Value Low #1

A/F Learn Value Mid1 #1

A/F Learn Value Mid2 #1

A/F Learn Value High #1

Status of IG Switch

Status of Ready

Status of Engine Start

Status of WI Terminal Low Voltage Guard Determination

Status of +B Terminal Low Voltage Guard Determination

Status of STA Terminal Low Voltage Guard Determination

Status of IG Switch Terminal Low Voltage Guard Determination

Status of Soak Timer Start

Soak Timer Start Request

Soak IC Current Timer Value

Soak Timer Clear

Soak Timer Start History

Soak IC First Start Time

Soak Start Count

Main Relay ON Time after IG OFF

Main Relay ON Time after IG OFF of Previous Trip

Main Relay ON Time after Soak Start of Previous Trip

Electric Fan Motor

Idle Fuel Cut

FC TAU

Fuel Remaining Volume

Communication with HV

Communication with Brake

A/F Sensor Determination (worst value) #1

Engine Speed Fluctuation Avg (worst value) #1

Engine Speed Fluctuation Avg (worst value) #2

Engine Speed Fluctuation Avg (worst value) #3

Engine Speed Fluctuation Avg (worst value) #4

Normal Mode Switch

Sports Mode Switch

Requested Engine Torque

HV Target Engine Speed

Actual Engine Torque

Engine Run Time

Request Engine Run Time

Judge Time Engine Ignition

Judge Time Engine Output

Fuel Level

ISC Learning

F/C for Engine Stop Req

Engine Independent

Racing Operation

Request Warm-up

Engine Independent Control

ISC Learning Value

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