Description of Frozen Values DENSO

Frozen values DENSO, description

Diagnostic Trouble Code (DTC)
The specific diagnostic trouble code (DTC) that has frozen values.

Read off fault type
Actual fault type with data.

Previous fault type
This fault type may be the same as above, although not necessarily.
All read off data is based on this fault type.

Time before the data was frozen
How long the fault existed before the frozen values were created.

Time after engine start
How long since the engine was started.

Outside temperature
Displays the actual outside temperature when the frozen values were created. The value is given in °C.

Atmospheric pressure
Displays the actual atmospheric pressure when the frozen values were created. The value is given in hPa.

Vehicle speed
Displays the actual vehicle speed when the frozen values were created. The value is given in km/h.

Engine speed
Displays the actual engine speed (RPM) when the frozen values were created. The value is given in rpm.

Mass air flow g/stroke
Displays the actual mass air flow in g/stroke when the frozen values were created.

Intake pressure
Displays the actual pressure in the intake manifold when the frozen values were created. The value is given in hPa.

Engine coolant temperature (ECT)
Displays the actual engine temperature when the frozen values were created. The value is given in °C.

Lambda compensation
Lambda compensation is rapid adjustment of the fuel adaptation value which continually adjusts the fuel air mixture. The area of adjustment is between 0-2. The normal value is 1 (no adaptation).

Long term fuel trim
Long term fuel trim is slow adjustment of the fuel trim value that is used to adapt the fuel / air mixture during longer periods. This value takes into consideration factors such as the aging of components and component tolerances etc. The area of adjustment is between 0-2. The normal value is 1 (no adaptation).

Accelerator pedal (AP) affected
Indicates whether the accelerator pedal (AP) was depressed or not when the frozen values were created.

Probe control
Indicates whether the engine was regulated using fuel trim or not when the frozen values were created.

Fuel shut-off system
Indicates whether the fuel shut-off system was active or not when the frozen values were created.

Operating cycle
Indicates whether the engine was active or not when the frozen values were created.
This happens when the engine speed (RPM) exceeds 600 rpm

Warm-up cycle
Indicates whether a warm-up cycle had been run or not when the frozen values were created.
A warm-up cycle is run if the engine coolant temperature (ECT) is between -7° C and +35° C when the engine is started.

Gear selected
Indicates whether a gear was selected or not when the frozen values were created.

Engine cooling fan (FC)
Indicates whether the engine cooling fan (FC) was active or not when the frozen values were created.

A/C requested
Indicates whether the air conditioning (A/C) was selected or not when the frozen values were created.

Air conditioning (A/C) compressor active
Indicates whether the air conditioning (A/C) compressor was active or not when the frozen values were created.

Brake pedal switch
Indicates whether the brake pedal was affected or not when the frozen values were created.

EVAP canister purge valve active
Indicates whether the EVAP canister purge valve was active or not when the frozen values were created.

Cruise control active
Indicates whether the cruise control was active or not when the frozen values were created.

EVAP canister shut-off valve
Indicates whether the EVAP canister shut-off valve was active or not when the frozen values were created.

State, fuel trim
Depending on the prevailing circumstances when the frozen values were created, one of the following alternatives may be stored.
1. no fuel trim, the start conditions have not been met .
This condition occurs at the crank or immediately after start before fuel trim has started
2. fuel trim with two probes .
This situation occurs during driving when both probes are used during fuel trim (part load)
3. no fuel trim, operation with predefined values .
This situation occurs during hard acceleration or during fuel shut-off when there is no fuel trim and operation is under predefined values
4. no fuel trim, operation with a system fault .
This situation occurs when an earlier diagnostic trouble code (DTC) was stored that caused the fuel trim to be disabled
5. fuel trim with one probe (front) .
This situation occurs at idling speed or during light acceleration when one probe (front) is used during fuel trim.

Battery voltage
Displays the actual battery voltage when the frozen values were created.

Passenger compartment temperature
Displays the temperature in the passenger compartment in the instant the frozen values were created.

Odometer setting
Displays the odometer setting in the instant the frozen values were created.

Frozen values dependent on diagnostic trouble codes (DTCs)
At the end there are some frozen values (normally four) which vary depending on the diagnostic trouble code (DTC) that is stored