ECD SYSTEM > FREEZE FRAME DATA

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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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, 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 an intelligent tester, 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 of the malfunction. The data may assist in identifying the cause of the malfunction, and in judging whether it was temporary or not.

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
MAF	Mass air flow volume	If approximately 0.0 gm/sec.: Mass air flow meter power source circuit is open or shorted VG circuit is open or shorted If 200 gm/sec. or more: E2G circuit is open
Atmosphere Pressure	Atmosphere pressure	-
MAP	Absolute pressure inside intake manifold	-
Coolant Temp	Engine coolant temperature	If -30°C (-22°F) or less, sensor circuit is open If 120°C (248°F) or more, sensor circuit is shorted
Intake Air	Intake air temperature	If -40°C (-40°F), sensor circuit is open If 140°C (284°F) or more, sensor circuit is shorted
Intake Air Temp (Turbo)	Intake air temperature after intercooler	If -30°C (-22°F) or less, sensor circuit is open If 149°C (300°F) or more, sensor circuit is shorted
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	-
Pre Glow	Pre glow operation	-
After Glow	After glow operation	-
Accel Position	Accelerator pedal position sensor	-
Accel Sens. No.1 Volt %	Accelerator pedal position No. 1 output voltage	-
Accel Sens. No.2 Volt %	Accelerator pedal position No. 2 output voltage	-
Target Throttle Position	Target throttle position	-
Actual Throttle Position	Actual throttle position	-
Diesel Throttle Learn Status	Diesel throttle learning history	If the system is functioning properly, learning will be performed when the ignition switch is turned from ON to off. NG indicates that the foreign object may be lodged in the throttle valve or actuator components, or a disconnection/short exists in the signal wires.
Throttle Sensor Volt %	Throttle position sensor output voltage	-
Throttle Motor DUTY	Throttle actuator	-
Injection Volume	Injection volume	-
Injection Feedback Val #1	Injection volume correction for cylinder 1	-
Injection Feedback Val #2	Injection volume correction for cylinder 2	-
Injection Feedback Val #3	Injection volume correction for cylinder 3	-
Injection Feedback Val #4	Injection volume correction for cylinder 4	-
Pilot 1 Injection Period	Pilot 1 injection	-
Pilot 2 Injection Period	Pilot 2 injection	-
Main Injection Period	Main injection	-
After Injection period	Post injection	-
Pilot 1 Injection Timing	Pilot 1 injection	-
Pilot 2 Injection Timing	Pilot 2 injection	-
Main Injection Timing	Main injection	-
After Injection Timing	Post injection	-
Target Common Rail Pressure	Target common rail pressure	-
Fuel Press	Fuel pressure	-
Fuel Temperature	Fuel temperature	-
Target Pump SCV Current	Pump current target final value	-
Pressure Discharge Valve	Pressure control valve operation signal	-
AF Lambda B1S1	Lambda equivalent ratio	-
AFS Voltage B1S1	Air fuel ratio sensor output voltage	-
AFS Current B1S1	Air fuel ratio sensor output current	-
Target EGR Position	Target EGR valve position	-
Actual EGR Valve Pos.	Actual EGR valve position	-
EGR Motor Duty #1	EGR valve motor duty ratio	-
EGR Close Lrn. Val.	EGR valve fully closed position learning value	-
EGR Close Lrn. Status	EGR valve fully closed position learning status	"OK" means the fully closed position learning has completed normally. When NG, the learned fully closed position may be outside of the normal range. When NG, there may be foreign matter stuck in the valve. HINT: After disconnecting and reconnecting the battery cable, if the ignition switch has not been turned off once, learning may not be completed.
EGR Operation Prohibit	EGR Active Test operation prohibit	-
EGR Cooler Bypass VSV	EGR cooler bypass valve VSV operation	-
EGR Cooler Bypass Position	EGR cooler bypass valve duty ratio	-
Target Booster Pressure	Target booster pressure	-
VN Turbo Command	VN turbo command	-
Actual VN Position	Actual VN turbo position	The actual VN position is controlled to reach the target (VN turbo command).
VN Position Sensor Out	Nozzle vane position sensor output voltage	-
VN Motor Duty	VN turbocharger motor duty	If the vanes do not move smoothly or are stuck, the difference between the target (VN turbo command) and actual value will become larger, resulting a larger VN motor duty.
VN Close Learn Value	VN turbocharger closed learning value	-
VN Close Learn Status	VN turbo fully closed learning status	If the VN close status learning has not completed, the correct status may not be output.
Exhaust Temperature B1S1	Exhaust temperature sensor for B1S1	If 20°C (68°F), sensor circuit is open If 900°C (1652°F) or more, sensor circuit is shorted
Exhaust Temperature B1S2	Exhaust temperature sensor for B1S2	If 20°C (68°F), sensor circuit is open If 900°C (1652°F) or more, sensor circuit is shorted
DPF Differential Pressure	DPF differential pressure sensor output	-
PM Accumulation Ratio	PM accumulation ratio	-
Starter Signal	Starter signal	-
Starter Control	Starter control	-
Neutral Position SW Signal	Park/neutral position SW signal	-
Clutch Switch	Clutch switch	-
Reverse Switch	Back-up light switch	-
Stop Light Switch	Stop light switch	-
Shift Indication Enable	Shift indication enable	-
A/C Signal	Air conditioning signal	-
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 cycle after DTC cleared	-
Engine Start Time	Engine start time	Time necessary for the engine to start.
Engine Speed (Starter Off)	Engine speed when starter off	This is the engine speed immediately after starting the engine.
Glow Request lighting Time	Indicates the length of time the glow indicator light was on	-
IG-ON Time	Elapsed time to start engine after the ignition switch was turned to ON	This shows the condition when the glow turn on request occurred. If a malfunction occurred during a cold engine start (below 0°C(32°F)), based on IG-ON Time it can be determined whether the request was made after the glow plug and glow indicator turned off or not.
MAF Low	Status of mass air flow rate low	This shows that the intake air volume measured by the mass air flow meter was insufficient, resulting in a continuous reduction of injection volume. If the intake system is clogged, the pipes are not properly connected, the intake air volume is low due to excessive EGR, or the mass air flow meter has deteriorated, the measured intake air volume may be lower than the normal volume.
Boost Pressure Low	Status of boost pressure low	This shows that the boost pressure (turbocharger boost pressure) was less than the target, resulting in a continuous reduction of injection volume.
Engine Coolant Temp High	Status of engine coolant temperature high	This shows that there was a continuous reduction of injection volume due to high engine coolant temperature (overheating).
MAF/Estimate MAF Ratio	Mass air flow rate (actual) / mass air flow rate (estimated) value	This shows the calculated intake air volume based on the intake air volume measured by the mass air flow meter, manifold pressure and intake air temperature.
Rough Idle #1 to #4	Status of No. 1 to No. 4 cylinder rough idle	This shows that the idle speed of this cylinder is lower than the other cylinder.
ACT VSV	A/C cut status for Active Test	-
Electric Fan Motor	Electric fan motor	-
Immobiliser Fuel Cut History	Status of immobiliser fuel cut	If this item was ON when DTC P1604 was detected, this means that the engine could not start due to immobiliser operation.