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 of a malfunction.
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 GTS, 5 separate sets of freeze frame data can be checked.
*1 | DTC stored |
*2 | 0.5 seconds |
*3 | Freeze frame data recorded |
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
Powertrain > Engine and ECTTester 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:
If 130 gm/sec or more:
|
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 higher, sensor circuit is shorted |
Intake Air | Intake air temperature | If -40°C (-40°F), sensor circuit is open If 140°C (284°F), 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 higher, 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 | - |
Eng Oil Press Switch Valve | Engine oil pressure switching valve status | - |
Engine Oil Pressure | Engine oil pressure | - |
Accel Position | Accelerator pedal position sensor | - |
Accel Sens. No.1 Volt % | Accelerator pedal position No. 1 | - |
Accel Sens. No.2 Volt % | Accelerator pedal position No. 2 | - |
Target Throttle Position | Target throttle position | - |
Actual Throttle Position | Actual throttle position | - |
Diesel Throttle Learn Status | Diesel throttle learning history |
|
Throttle Sensor Volt % | Throttle position sensor output voltage | - |
Throttle Motor DUTY | Throttle actuator duty | - |
Injection Volume | Injection volume | - |
Injection Feedback Val #1 | Injection volume correction for No. 1 cylinder | - |
Injection Feedback Val #2 | Injection volume correction for No. 2 cylinder | - |
Injection Feedback Val #3 | Injection volume correction for No. 3 cylinder | - |
Injection Feedback Val #4 | Injection volume correction for No. 4 cylinder | - |
Pilot 1 Injection Period | Pilot 1 injection period | - |
Pilot 2 Injection Period | Pilot 2 injection period | - |
Main Injection Period | Main injection period | - |
After Injection Period | After injection period | - |
Pilot 1 Injection Timing | Pilot 1 injection timing | - |
Pilot 2 Injection Timing | Pilot 2 injection timing | - |
Main Injection Timing | Main injection timing | - |
After Injection Timing | After injection timing | - |
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 learned value | - |
EGR Close Lrn. Status | EGR valve fully closed position learning status |
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 position | - |
Target Booster Pressure | Target boost pressure | - |
VN Turbo Command | VN turbo command value | - |
Actual VN Position | Actual VN turbo position | The actual VN turbo 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 gas temperature of CCo catalyst | If 20°C (68°F), sensor circuit is open If 900°C (1652°F), sensor circuit is shorted |
Exhaust Temperature B1S2 | Exhaust gas temperature of DPF catalyst | If 20°C (68°F), sensor circuit is open If 900°C (1652°F), sensor circuit is shorted |
DPF Differential Pressure | DPF differential pressure sensor output | - |
PM Accumulation Ratio | PM accumulation ratio | - |
Starter Signal | Starter signal | - |
Neutral Position SW Signal | Park/neutral position switch 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 conditioner signal | - |
Immobiliser Communication | Immobiliser communication | - |
Electrical Load Signal | Electrical load signal | - |
Engine Oil Volume (Overfill) | Status of the engine oil volume (Overfill) | - |
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, 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 | Status of No. 1 cylinder rough idle | This shows that the idle speed of this cylinder is lower than the other cylinder. |
Rough Idle #2 | Status of No. 2 cylinder rough idle | This shows that the idle speed of this cylinder is lower than the other cylinder. |
Rough Idle #3 | Status of No. 3 cylinder rough idle | This shows that the idle speed of this cylinder is lower than the other cylinder. |
Rough Idle #4 | Status of 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 operation | - |
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. |
Stop&Start of Eng State | Engine status of stop and start system | - |