Description of Frozen Values, TCM

Description of frozen values

General
Frozen values are parameter values that are stored when a diagnostic trouble code (DTC) is stored.
Not all the parameters described need to be implemented in the control module. This varies from system to system. Parameters can also vary depending on which type of transmission the car has.
Certain parameters can be displayed without a value or with implausible values. This can occur if the control module has not stored a value, when a base value has been stored instead or if the parameter is received via the CAN network when there is an error on the CAN network. For example, the transmission speed value may be excessive if the fault occurs for the transmission speed sensor.

Definition of an operating cycle
The definition of an operating cycle varies depending on the software version.

Alternative definitions
- The ignition has been switched off, then switched on and finally switched off again
- The ignition has been switched off, the engine started and finally the ignition switched off again
- The ignition has been off, the engine started, the car driven at a speed above 30 km/h for more than 3 minutes and finally the ignition switched off again.

Diagnostic Trouble Code (DTC)
The diagnostic trouble code (DTC) the frozen values are stored for.

Engine, running
The value indicates the status of the engine when the diagnostic trouble code (DTC) was stored.
OFF = Engine not running.
On = Engine running.

Passenger compartment temperature
The value indicates the passenger compartment temperature when the diagnostic trouble code (DTC) was stored. The transmission control module (TCM) obtains the value via the controller area network (CAN) from the central electronic module (CEM). The value is given in °C.

Outside temperature
The value indicates the outside temperature when the diagnostic trouble code (DTC) was stored. The transmission control module (TCM) obtains the value via the controller area network (CAN) from the central electronic module (CEM). The value is given in °C.

Battery voltage, central electronic module (CEM)
The value indicates the voltage in volts. The first and last time the diagnostic trouble code (DTC) was stored. The transmission control module (TCM) obtains the value via the controller area network (CAN) from the central electronic module (CEM). The value is given in volts (V).

Mileage
The value indicates the total mileage of the car at the time the diagnostic trouble code (DTC) was stored. The transmission control module (TCM) obtains the value via the controller area network (CAN) from the central electronic module (CEM).

Car speed (Transmission Control Module (TCM))
The value indicates the car's speed, calculated from the transmission speed, speed sensor and transmission input speed sensor and speed signal from the brake control module (BCM).

Engine speed (RPM)
The engine control module (ECM) transmits the engine speed (RPM) on the Control area network (CAN). The transmission control module (TCM) retrieves the signal from the controller area network (CAN) and compares with its own speed sensor signal.
The value indicates the engine speed (RPM).

Engine coolant temperature (ECT)
The value indicates the engine coolant temperature. The engine control module (ECM) transmits a signal indicating the engine coolant temperature (ECT) on the controller area network (CAN). The value is given in °C.

Engine torque
The value indicates the engine torque. The value is given in Nm.

Accelerator pedal (AP) position
The value indicates the position of the accelerator pedal (AP). The transmission control module (TCM) obtains the value via the controller area network (CAN) from the engine control module (ECM). The value is given in %.

Gear shift selector, position
The value indicates the position of the gear selector based on the signal from the gear-shift position sensor. The following values can be displayed: P, R, N, D.

Gear according to the shift solenoids
The value indicates the selected gear (according to the gear solenoids). The value indicated depends on the transmission type.
The following values can be displayed: Back-up gear, Gear 1, Gear 2, Gear 3, Gear 4, Gear 5.

Lock-up function according to solenoids
The value indicates the status of the Lock-up function according to how the control module has activated the solenoids.
No Lock up/Slipping lock up/Locked lock up.

Oil temperature
The value indicates the temperature of the transmission fluid. The value is calculated from the oil temperature sensor signal and is given in °C.

Expected gear ratio
The value indicates the gear ratio anticipated by the transmission control module (TCM).

Last activated gear
The value indicates the last activated gear (the gear before the diagnostic trouble code (DTC) was stored).

Relevant gear ratio
The value indicates the transmission gear ratio.

Input speed
The value indicates the input speed from the transmission speed sensor. The speed can be generated with the engine idling and the gear selector in P/N position. If the gear selector is in any other position, a gear is engaged and the transmission input shaft is connected to the output shaft and an RPM will not be indicated until the car is driven. Depending on slippage in the torque converter the transmission speed and the engine speed will differ when the lock-up function is not engaged. With lock-up engaged the transmission speed should be the same as engine speed (RPM).

Output speed
The value indicates the output speed calculated from the signal from the transmission output speed sensor. The value is given in rpm.

Control module power supply
The value indicates the system voltage. The value is given in volts (V).

Gear/Geartronic, shift up/down
The value indicates if the gear selector lever is moved up or down in geartronic position at the time the diagnostic trouble code (DTC) was stored
Shift up - YES/NO.
Shift down - YES/NO.

Power supply for gear selector assembly, status
The value indicates if the voltage for the gear selector module (GSM) is normal or incorrect.

Shift solenoid S1-S5, activated by transmission control module (TCM)
Transmission Control Module (TCM) activates shift solenoids S1-S5 in different shifting patterns.
OFF = Solenoid not activated.
ON = Solenoid activated.

Hint: The value is compared with the value in Shift solenoids S1-S5 status and should display the same value if the system is OK.

Shift solenoids S1-S5 status
The value indicates the status of shift solenoids S1-S5.
OFF = Solenoid not activated.
ON = Solenoid activated.

Hint: If the value of Shift solenoids S1-S5, activated by the transmission control module (TCM) displays OFF and Shift solenoids S1-S5 status displays ONthere is an open-circuit or a short-circuit to supply voltage in the solenoid circuit
If the value for Shift solenoids S1-S5, activated by the transmission control module (TCM) displays ON and Shift solenoids S1-S5 status displays OFF there is a is short-circuit to ground in the solenoid circuit.

Linear pressure solenoid SLT, current
The value indicates the current through the linear solenoid SLT and is given in milliamps (mA)

Lock-up solenoid SLU current
The value indicates the current through the Lock-up solenoid SLU and is given in milliamps (mA)

Linear pressure solenoid SLS, current
The value indicates the current through the Linear solenoid SLS and is given in amps (A).

Gear/Geartronic status
The value indicates the status of the geartronic position (Manual shifting).
Activated=Geartronic ( M).
Not Active= Gear shift selector in position D.

Linear pressure solenoid SLT, requested current
The value indicates the requested current for activating the Linear pressure solenoid SLT. The value is given in milliamps (mA).

Lock-up solenoid SLU, requested current
The value indicates the requested current for activating the Lock-up solenoid SLT. The value is given in milliamps (mA).

Linear pressure solenoid SLS, requested current
The value indicates the requested current for activating the Linear pressure solenoid SLS. The value is given in milliamps (mA).

Anticipated gear
The value indicates anticipated gears 1-5.

Anticipated Lock-up function
The value indicates the status of the Lock-up function.
Active=The Lock up function anticipates being engaged.
Not Active=The Lock up function anticipates not being engaged.

Lock-up function, status
The value indicates the status of the Lock-up function.
Active=Lock up function engaged.
Not Active=Lock up function not engaged.

Slipping Lock-up
The value indicates the differences in rpm between the engine and transmission.

Shift-lock status
The value indicates the status of the solenoid for the shift-lock function.
Active / Not active.

Park / neutral position (PNP) switch status
The value indicates the status of the solenoid for the park / neutral position (PNP) function.
Start permitted/Start not permitted.

Stop lamp switch, status
The value indicates the status of the stop lamp switch. The transmission control module (TCM) obtains the value from the central electronic module (CEM) via the controller area network (CAN).
Activated= Brake pedal affected.
Not activated = Brake pedal not affected.

Speed signal from the brake control module (BCM)
The value displays the vehicle speed. The transmission control module (TCM) obtains the value from the brake control module (BCM) via the controller area network (CAN).

Oil temperature between 100-110 °C
The value indicates how long the oil temperature has been within the 100-110 °C range.

Oil temperature between 110-120 °C
The value indicates how long the oil temperature has been within the 110-120 °C range.

Oil temperature between 120-130 °C
The value indicates how long the oil temperature has been within the 120-130 °C range.

Oil temperature between 130-140 °C
The value indicates how long the oil temperature has been within the 130-140 °C range.

Oil temperature between 140-150 °C
The value indicates how long the oil temperature has been within the 140-150 °C range.

Oil temperature higher than 150 °C
The value indicates how long the oil temperature has been higher than 150°C.