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Home >> Volvo >> 2002 >> S80 T6 Executive L6-2.9L Turbo VIN 91 B6294T >> Repair and Diagnosis >> Transmission and Drivetrain >> Transmission Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Vehicle Communication Information, Transmission Control Module (TCM) >> Description Of Parameters

Description Of Parameters






Description of parameters

Parameters, status

General
Certain values deviate from those contained in the signal specifications, see Signal specification, 4T65EV-GT Signal Description. This is because read off values are calculated and filtered by the control module. In certain cases the engine must be running to obtain the relevant values.

Shifting program according to the gear-shift position sensor
This value shows the shifting program selected by the transmission control module (TCM), based on gear-shift position sensor signals. If the signals from the gear-shift position sensor are outside (ERROR) the normal range and a diagnostic trouble code (DTC) is stored, the transmission control module (TCM) selects Limp home mode.
Depending on what gear selector assembly the car is equipped with:
P/R/N/D/3/L = normal gear positions. (Standard)
P/R/N/D/3/2/1 = normal gear positions. (Standard)
P/R/N/D/Geartronic = normal gear positions (Geartronic)

Gear-shift position sensor position
Depending on what gear selector assembly the car is equipped with:
P/R/N/D/3/L = normal gear positions. (Standard)
P/R/N/D/3/2/1 = normal gear positions. (Standard)
P/R/N/D/Geartronic = normal gear positions (Geartronic)
OR/OD = Undefined R or D positions, which means that the signals from the gear-shift position sensor are outside the normal range but are not interpreted as a fault. This may be because the gear selector is between positions or that the gear-shift position sensor is incorrectly adjusted.
FAULT = the gear-shift position sensor has transmitted the wrong combination of signals and a diagnostic trouble code (DTC) has been stored.

Gear-shift position sensor signal A

Gear selector assembly with:
6 positions = PRND3L
7 positions = PRND321
Geartronic PRND3

Lever position/signal:
Position P: Signal A = LOW
Position R: Signal A = LOW
Position N: Signal A = HIGH
Position D: Signal A = HIGH
Position 3: Signal A = LOW
Position 2: Signal A = HIGH
Position 1: Signal A = HIGH
Position L: Signal A = HIGH
LOW = The signal is grounded in the gear-shift position sensor
HIGH = The signal is not grounded in the gear-shift position sensor

Gear-shift position sensor signal B

Gear selector assembly with:
6 positions = PRND3L
7 positions = PRND321
Geartronic PRND3

Lever position/signal:
Position P: Signal B = HIGH
Position R: Signal B = LOW
Position N: Signal B = LOW
Position D: Signal B = LOW
Position 3: Signal B = LOW
Position 2: Signal A = HIGH
Position 1: Signal A = HIGH
Position L: Signal B = HIGH
HIGH = The signal is not grounded in the gear-shift position sensor
LOW = The signal is grounded in the gear-shift position sensor

Gear-shift position sensor signal C

Gear selector assembly with:
6 positions = PRND3L
7 positions = PRND321
Geartronic PRND3

Lever position/signal:
Position P: Signal C = HIGH
Position R: Signal C = HIGH
Position N: Signal C = HIGH
Position D: Signal C = LOW
Position 3: Signal C = LOW
Position 2: Signal A = LOW
Position 1: Signal A = LOW
Position L: Signal C = LOW
HIGH = The signal is not grounded in the gear-shift position sensor
LOW = The signal is grounded in the gear-shift position sensor

Gear-shift position sensor signal PA

Gear selector assembly with:
6 positions = PRND3L
7 positions = PRND321
Geartronic PRND3

Lever position/signal:
Position P: Signal PA = LOW
Position R: Signal PA = HIGH
Position N: Signal PA = LOW
Position D: Signal PA = HIGH
Position 3: Signal PA = LOW
Position 2: Signal A = HIGH
Position 1: Signal A = LOW
Position L: Signal PA = HIGH
HIGH = The signal is not grounded in the gear-shift position sensor
LOW = The signal is grounded in the gear-shift position sensor

Quickshift mode (Geartronic)
Applies to gear selector assembly with Geartronic.
The value indicates whether the quick shift mode is selected or not.
ON = The gear selector in position P/R/N/D
ON = The gear selector in Geartronic

Quick shift shifting from the gear selector module (Geartronic)
Applies to gear selector assembly with Geartronic.
The value indicates which function the gear selector module transmits to the transmission control module (TCM).
No shift = no geartronic function
Increase gear = shift up
Decrease gear = shift down

Quick shift status according to the transmission control module (Geartronic)
Applies to gear selector assembly with Geartronic.
This value indicates the shifting program selected by the control module based on the signal from the gear selector.
Normal = P/R/N/D
Quick shift = Geartronic

Winter program status
This value indicates the shifting program selected by the control module based on the signal from the mode selector. W = Winter mode.
Engaged = Winter mode engaged
Disengaged = Winter mode disengaged

Current gear (according to gear ratio)
- R, no lock-up
- Gear 1, no lock-up
- Gear 2, no lock-up
- Gear 3, no lock-up
- Gear 4, no lock-up
- Gear 5, no lock-up
- Gear 2, lock-up
- Gear 3, lock-up
- Gear 4, lock-up
- Gear 5, lock-up.

Recommended gear from the transmission control module (TCM)
- R, no lock-up
- Gear 1, no lock-up
- Gear 2, no lock-up
- Gear 3, no lock-up
- Gear 4, no lock-up
- Gear 5, no lock-up
- Gear 2, lock-up
- Gear 3, lock-up
- Gear 4, lock-up
- Gear 5, lock-up.

Shift solenoid status S1
OFF = The solenoid is not activated
ON = The solenoid is activated

Shift solenoid status S2
OFF = The solenoid is not activated
ON = The solenoid is activated

Lock-up solenoid SL status
OFF = The lock-up solenoid is not activated
ON = The lock-up solenoid is activated

Lock-up pressure switch
Applies only to 4T65EV-GT.
The pressure switch is affected by the transmission line pressure. The control module uses the signal from the pressure switch to check whether the lock-up solenoid is activated when the control module has requested lock-up.
OFF = No lock-up activated
ON = Lock-up activated

Stop lamp switch
The engine control module (ECM) transmits a signal on the Control area network (CAN) indicating whether the stop lamp switch is activated or not. The transmission control module (TCM) uses the signal for the internal gear functions and diagnosing the transmission.
OFF = Stop lamp switch unaffected
ON = Stop lamp switch affected

Kickdown
If the kickdown function parameter in the accelerator pedal (AP) is passed (approx 87 %) kickdown is activated. During fast acceleration, the accelerator pedal (AP) is depressed to approximately 87 %, the transmission control module (TCM) gives the signal for kickdown.
OFF = Kickdown is not activated
ON = Kickdown is activated

TCM diagnostic trouble codes (DTCs) status
The value indicates whether there are any diagnostic trouble codes (DTCs) stored in the transmission control module (TCM).
- At least one diagnostic trouble code (DTC) stored
- No diagnostic trouble code (DTC) stored.

TCM diagnostic check status
The value indicates whether the transmission control module (TCM) has carried out a complete diagnosis.
- At least one diagnostic test not completed
- All diagnostic tests complete.

Ignition key position
Ignition key position in the ignition switch.
- Ignition key in position "0"
- Ignition key in position "I"
- Ignition key in position "II"
- Ignition key in position "III".

Engine ignition status
YES = Ignition on
NO = Ignition off

Engine running
YES = Engine running
NO = Engine off

Parameters, value

Engine speed (RPM)
The engine control module (ECM) transmits the engine speed (RPM) on the Control area network (CAN) from which the transmission control module (TCM) retrieves the signal which it then compares with its own speed sensor signal. The signal is used when shifting and when diagnosing the transmission speed sensor.
Measurement range: 0 - 8191 rpm
Idling speed: 850 rpm

Transmission speed sensor, input speed
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).
Measurement range (rpm): 0 -

TCM output speed sensor, calculated speed
The control module receives a signal from the transmission speed sensor which is affected by a toothed pulse wheel and calculates the vehicle speed based on the signal. The speed sensor is an "active" sensor, magnet resistive with a current modulated interface. The speed is directly proportional to the frequency.
Measurement range: 0 km/h - top speed

Vehicle speed ABS
The ABS control module transmits a signal indicating the vehicle speed on the Control area network (CAN) from where the transmission control module retrieves the signal. The transmission control module (TCM) compares it with the signal from the transmission speed sensor.
Measurement range: 0 km/h - top speed

Throttle, position
The engine control module (ECM) transmits the accelerator pedal (AP) position on the Control area network (CAN) from where the transmission control module (TCM) retrieves the signal. The signal is used to regulate the system pressure in the transmission.
Measurement range: 0 - 100 %
>99 % = kickdown

Calculated battery voltage
The value indicates the calculated battery voltage at the control module.
Measurement range: 0.0 -25.5 V

Battery voltage
The value indicates battery voltage at the control module.
Measurement range: 0.0 -25.5 V

The oil temperature sensor signal
The value indicates the oil temperature sensor signal. Voltage decreases with increased sensor temperature.
Measurement range: 0.0 -5.0 V
AW 50-42:
Cold transmission (+20°C): approximately 2.4 V
Hot transmission (+100°C): 0.3 -0.5 V
4T65EV/EV-GT:
Cold transmission (+20°C): approximately 3-3.5- V
Hot transmission (+100°C): 0.8-1.2 V

Oil temperature
The transmission control module (TCM) calculates the temperature from the oil temperature sensor signal.
Measurement range: -60 - +180°C

Gear ratios
The value indicates the transmission gear ratio. The control module uses the input and output speeds to calculate the gear ratio. For the correct gear ratio see the table below
















Expected gear ratio
The value indicates the gear ratio anticipated by the transmission control module (TCM). Compare the values with the " Gear ratio" table.

Line pressure solenoid STH amperage
The value indicates the amperage passing through the solenoid circuit. A lower amperage gives a higher reference pressure, which gives a higher line pressure. Solenoid control is directly dependent on the throttle sensor signal. The higher the signal from the throttle sensor the lower the amperage through the solenoid and therefore the higher the line pressure.
Measurement range: 0.0-1.5 A
Normal value at closed throttle:

Line pressure solenoid STH, control
Line pressure solenoid STH controls the reference pressure for the transmission. The reference pressure in turn controls the system pressure in the transmission so that the system pressure in gear D varies between 0.055 - 0.5 Mpa. Solenoid control is directly dependent on the signal from the throttle position (TP) sensor. The higher the signal from the throttle position (TP) sensor the greater the reference pressure and therefore line pressure.
Measurement range: 0 - 100 %
0 % control, minimal reference pressure, gives lowest line pressure.
100 % control, maximum reference pressure, gives highest line pressure.

Torque control
Torque reduction occurs through control of the ignition and is used to lower the engine torque while shifting for smoother gearshifts and longer service life. Torque reduction is activated at the same time that shifting starts.
Measurement range: 0 - 511 Nm

Engine torque
The signal displays the calculated output torque of the engine.
Measurement range: -512 - +511 Nm
511 = No torque limiting request

Torque limiting requested
The signal displays torque limiting and is used to limit the torque of the engine continuously in those cases where the maximum permitted torque limit of the transmission would otherwise have been exceeded. To reach the desired reduction level the engine control module (ECM) uses a mixture of ignition reduction and throttle control.
Measurement range: -512 - +511 Nm
511 = No torque limiting request

Engine control module (ECM) engine coolant temperature (ECT)
The engine control module (ECM) transmits a signal indicating the engine coolant temperature (ECT) on the Control area network (CAN). The automatic transmission uses the signal to govern lock-up.
Measurement range: -60 - +195°C

Text transmitted to the driver information module
In the event of a service reminder indicator fault, the transmission control module (TCM) transmits a message to the driver information module. The text is displayed in the combined instrument panel display.
1 = TRANSMISSION SERVICE URGENT
2 = TRANSMISSION SERVICE REQUIRED
3 = TRANSMISSION FIX NEXT SERVICE
4 = TRANSMISSION OIL TEMP HIGH
5 = CHANGE TRANS OIL AT NEXT SERVICE

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