Freeze Frame Data

1. DESCRIPTION

Freeze frame data records the engine conditions (fuel system, calculated load, engine coolant temperature, fuel trim, engine speed, vehicle speed, etc.) when a malfunction is detected. When troubleshooting, it can help determine if the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was Lean or Rich, and other data from the time the malfunction occurred. HINT:

If it is impossible to duplicate 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 intelligent tester, 5 separate sets of freeze frame data 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 the cause of the malfunction, and in judging whether it was temporary or not.

2. LIST OF FREEZE FRAME DATA

A103809E11

LABEL (Intelligent Tester Display)

Measurement Item

Diagnostic Note

INJECTOR

Injection period of No. 1 cylinder

-

IGN ADVANCE

Ignition advance

-

CALC LOAD

Calculated load

Calculated load by ECM

VEHICLE LOAD

Vehicle load

-

MAF

Mass air flow volume

If approximately 0.0 g/sec.:

• Mass air flow meter power source circuit open or short

• VG circuit open or short If 160.0 g/sec. or more:

• E2G circuit open

ENGINE SPD

Engine speed

-

VEHICLE SPD

Vehicle speed

Speed indicated on speedometer

COOLANT TEMP

Engine coolant temperature

If -40°C (-40°F), sensor circuit open If 140°C (284°F) or more, sensor circuit shorted

INTAKE AIR

Intake air temperature

If -40°C (-40°F), sensor circuit open If 140°C (284°F) or more, sensor circuit shorted

AIR-FUEL RATIO

Ratio compared to stoichiometric level

-

PURGE DENSITY

Learning value of purge density

-

EVAP PURGE FLOW

Ratio of evaporative purge flow to intake air volume

-

EVAP PURGE VSV

EVAP purge VSV duty ratio

-

KNOCK CRRTVAL

Correction learning value of knocking

-

LABEL (Intelligent Tester Display)

Measurement Item

Diagnostic Note

KNOCK FB VAL

Feedback value of knocking

-

ACCEL POS#1

Absolute Accelerator Pedal Position (APP) No.1

-

ACCEL POS#2

Absolute APP No. 2

-

THROTTLE POS

Throttle sensor positioning

-

THROTTLE POS

Throttle position

-

THROTTLE POS #2

Throttle sensor positioning #2

-

THROTTLE MOT

Throttle motor

-

O2S B1 S2

Heated oxygen sensor output

Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check output voltage of sensor

AFS B1 S1

A/F sensor output

Performing INJ VOL or A/F CONTROL function of ACTIVE TEST enables technician to check output voltage of sensor

TOTAL FT#1

Total fuel trim

-

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

FUEL SYS #1

Fuel system status

• OL (Open Loop): Has not yet satisfied conditions to go closed loop

• CL (Closed Loop): Using A/F sensor as feedback for fuel control

• OL DRIVE: Open loop due to driving conditions (fuel enrichment)

• OL FAULT: Open loop due to detected system fault

• CL FAULT: Closed loop but A/F sensor, which used for fuel control malfunctioning

O2FT B1 S2

Fuel trim at heated oxygen sensor

-

AF FT B1 S1

Fuel trim at A/F sensor

-

AFS B1 S1

A/F sensor current

-

CAT TEMP B1S1

Estimated catalyst temperature (sensor 1)

-

CAT TEMP B1S2

Estimated catalyst temperature (sensor 2)

-

S O2S B1S2

Sub heated oxygen sensor impedance (sensor 2)

-

INI COOL TEMP

Engine coolant temperature at engine start

-

INI INTAKE TEMP

Intake air temperature at engine start

-

INJ VOL

Injection volume

-

STARTER SIG

Starter switch (STSW) signal

-

PS SW

Power steering signal

-

PS SIGNAL

Power steering signal (history)

Signal status usually ON until ignition switch turned OFF

CTP SW

Closed throttle position switch

-

A/C SIGNAL

A/C signal

-

PNP SW (NSW)

Park/Neutral Position (PNP) switch signal

-

ELECT LOAD SIG

Electrical load signal

-

STOP LIGHT SW

Stop light switch

-

BATTERY VOLTAGE

Battery voltage

-

ATM PRESSURE

Atmosphere pressure

-

EVAP (Purge) VSV

EVAP Purge VSV

-

FUEL PUMP/SPD

Fuel pump/speed status

-

ES

LABEL (Intelligent Tester Display)

Measurement Item

Diagnostic Note

VVT CTRL B1

VVT control status

-

VACUUM PUMP

Key-off EVAP system leak detection pump status

(see page ES-333)

EVAP VENT VAL

Key-off EVAP system vent valve status

-

FAN MOTOR

Electric fan motor

-

TC/TE1

TC and CG (TE1) terminals of DLC3

-

ENG SPEED #1

Engine rpm during No. 1 cylinder fuel cut

Output only when FUEL CUT #1 is performed using ACTIVE TEST

ENG SPEED #2

Engine rpm during No. 2 cylinder fuel cut

Output only when FUEL CUT #2 is performed using ACTIVE TEST

ENG SPEED #3

Engine rpm during No. 3 cylinder fuel cut

Output only when FUEL CUT #3 is performed using ACTIVE TEST

ENG SPEED #4

Engine rpm during No. 4 cylinder fuel cut

Output only when FUEL CUT #4 is performed using ACTIVE TEST

ENG SPEED ALL

Average of engine rpm values during fuel cut of No. 1 to No. 4 cylinders

Output only when ACTIVE TEST is performed

VVTL AIM ANGL#1

VVT aim angle

-

VVT CHNG ANGL#1

VVT angle

-

VVT OCV DUTY B1

VVT OCV operation duty

-

FC IDL

Fuel cut idle

ON: when throttle valve fully closed and engine speed over 3,500 rpm

FC TAU

Fuel cut during very light load

Fuel cut being performed under very light load to prevent engine combustion from becoming incomplete

IGNITION

Ignition counter

-

CYL #1

Cylinder #1 misfire

Only displayed during idling

CYL #2

Cylinder #2 misfire

Only displayed during idling

CYL #3

Cylinder #3 misfire

Only displayed during idling

CYL #4

Cylinder #4 misfire

Only displayed during idling

CYL ALL

All cylinders misfire

Only displayed during idling

MISFIRE RPM

Engine speed when misfire occurred

-

MISFIRE LOAD

Engine load when misfire occurred

-

MISFIRE MARGIN

Margin to detect engine misfire

-

MIL ON RUN DIST

Distance after DTC is detected

-

ENG RUN TIME

Accumulated engine running time

-

TIME DTC CLEAR

Cumulative time after DTC cleared

-

DIST DTC CLEAR

Accumulated distance from DTC cleared

-

WU CYC DTC CLEAR

Warm-up cycle after DTC cleared

-

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