Sport and Winter Shifting Programs
SPORT SWITCH
There is a spring-loaded switch in the knob of the selector lever with which it is possible to change between NORMAL and SPORT gear shifting programs. NORMAL is always connected from the start. The SPORT program means that the transmission stays longer than normal in each gear and that the gear shifting points are adapted to performance. The gear shifting points for light acceleration and full acceleration are, however, identical for NORMAL and SPORT. Activation Of the switch gives 0 V (ground) on pin 20 of the TCM.
When the SPORT program has been selected, the SPORT indicator lamp comes on in the main instrument.
The SPORT program is disconnected if the switch is activated again, if the ignition is switched off, during emergency operation (limp-home) or when the WINTER gear shifting program is activated.
WINTER SWITCH
In order to facilitate starting if the road is slippery, the transmission is fitted with a winter starting program. The transmission is then automatically prevented from engaging first and second gears and the car is started in third gear.
A spring-loaded switch in the selector lever's console makes it possible to select the WINTER gear shifting program.
Activation of the switch gives V (ground) on pin 21 of the TCM.
The WINTER indicator lamp in the main instrument comes on at the same time as WINTER is selected. WINTER can be selected in gear D with the result that SPORT cannot be selected.
WINTER is disconnected if:
^ the switch is depressed,
^ the ignition is switched on or off,
^ the kick-down contact is activated for >2 seconds,
^ the speed is >80 km/h (50 mph),
^ the fluid temperature is >150°C, or
^ limp-home occurs.
KICK-DOWN FUNCTION
The kick-down function gives information to the TCM, pin 8, if the accelerator pedal is fully depressed.
The kick-down switch is fitted below the accelerator pedal.
A fully depressed accelerator pedal activates the kick-down switch and gives 0 V (ground) on pin 8. The TCM uses the signal to select gear shifting points for maximum performance. The kick-down function is available in all gear shifting programs.
SHIFT-LOCK
For certain markets the transmission is delivered with a shift-lock function, which means that when the selector lever is in position P it is impossible to move it unless the brake pedal is simultaneously depressed.
The shift-lock relay is connected, in parallel with two of the transmission range switch's contacts, to pins 10 and 28 on the TCM.
The shift-lock relay and its lifting magnet generate the SHIFT-LOOK function.
The shift-lock relay is fined in the distribution center under the main instrument. Because of the parallel connection mentioned above, a faulty transmission range switch and a faulty shift-lock relay give the same fault-function on pins 10 and 28 and thus the same diagnostic trouble code (P0705).
The lifting magnet is fitted in the selector lever's console and controls the operating ability of the selector lever. When starting with the selector lever in position P, input signals B and 0 on the shift-lock are < 0.5 V. In all other gear selector positions one or both signals are battery positive voltage.
A non-activated brake pedal gives battery positive voltage on input signal R. If the brake pedal is activated, 0.5 V is received. When all 3 input signals to the relay are < 0.5 V, output 87 falls and the lifting magnet becomes passive. This makes operation of the selector lever possible.
The shift-lock function can be de-activated by removing fuse 9.
SHIFT SOLENOID VALVES
All solenoid valves are located in the shift solenoid assembly which is fitted to the transmission. Shift solenoid S1 and S2 control the shifting of gears. The solenoids are automatically grounded in the transmission during assembly and operate when they are activated via battery voltage. Solenoid S1 is powered via pin 1 and solenoid S2 via pin 3 in the TCM.
Power supply (ON/OFF) is controlled by the TCM, which gives a signal for shifting gears up or down, depending on speed, throttle position and the preselected driving program.
The shift solenoids (S1 and S2) function as regards gear positions like this:
Gear S1 S2
position
1 OFF ON
2 ON ON
3 ON OFF
4 OFF OFF
The winding resistance in the solenoid is nominally 13 ohms.
Solenoids S1 and S2 are identical.
In the WINTER gear shifting program with gear position D, third gear is automatically engaged. This can be used to check the functioning of solenoids S1 and S2. By repeatedly switching between ON and OFF on the WINTER switch, the power supply to S1 and S2 can be measured as battery positive voltage and 0 V respectively by switching the program between gear positions 1 and 3.
Winter S1 S2
Position
OFF 0 V Batt Pos V
ON Batt Pos V 0 V
Shift solenoids S1 and S2 open and close the fluid circulation system in the gear shifting sequences.
The torque converter clutch solenoid (SL) is located in the shift solenoid assembly which is fitted to the transmission. This solenoid controls the torque converter's lock-up function.
The solenoid is automatically grounded in the transmission during assembly and operates when it is activated via battery voltage. The solenoid is powered via pin 19 on the TCM.
The power supply (ON/OFF) is controlled by the TCM, which gives a signal for shifting gears up or down, depending on speed, throttle position and the pre-selected driving program.
The winding resistance in the solenoid is nominally 13 ohms.
PRESSURE CONTROL SOLENOID
The pressure control solenoid (ST) is located in the shift solenoid assembly which is fitted on the transmission. This solenoid controls the system pressure in the transmission.
Unlike the other solenoids the pressure control solenoid is not grounded in the transmission, but instead the solenoid's power circuit is switched on in the TCM. The solenoid is powered via pin 16 in the TCM and the return feed goes to pin 34 in the TCM. The solenoid is controlled by varying current from the TCM. The current is primarily affected by the throttle position. When the current is high, about 1 A, the fluid pressure becomes low and when the current is low or switched off, the system pressure becomes maximum.
The winding resistance in the solenoid is about 4 ohms.
When idling, with the hand-brake applied and selector lever in position D, the current should be about 900 mA and the fluid pressure 3.4 - 4.6 bar.
SPORT INDICATOR LAMP
When the SPORT gear shifting program is activated, the SPORT indicator lamp in the main instrument comes on.
The lamp is grounded by the TCM via pin 24 and powered via the main instrument.
WINTER INDICATOR LAMP
When the WINTER gear shifting program is activated, the WINTER indicator lamp in the main instrument comes on.
The lamp is grounded by the TCM via pin 7 and is powered via the main instrument.
CHECK GEARBOX WARNING LAMP
The CHECK ENGINE warning lamp is found in the main instrument.
The lamp is grounded by the TCM via pin 6 and powered via the main instrument.
The lamp comes on for 3 seconds when the ignition is switched to drive position (lamp test).
The TCM activates the emergency operation program and switches on the warning lamp when certain specified faults occur in the functioning. The missing function is replaced in the TCM by a fixed, stored replacement value, which makes it possible to drive the car to a workshop.
The emergency operating program gives a gear position as follows:
Gear position P R N D 3 2 1
Emergency operation P R N 4 4 3 3
Diagnostic trouble codes will appear at the same time as the lamp comes on.
TORQUE LIMITATION
When shifting between certain gears the torque from the engine is reduced in order to make the shifting smoother and to reduce the wear on the transmission.
In order to control this, a signal is sent from pin 13 in the TCM to pin 51 in the ECM. The TCM knows when to shift gear and informs the MOTRONIC ECM about this. Torque limitation is carried out by the MOTRONIC ECM, which reduces the ignition causing the torque to fall.
The signal between the control module is different for 4-cyl and 6-cyl engines.
There is normally battery positive voltage on the signal cable. If the TCM requests torque limitation, it activates pin 13 to 0 V (ground) for a period of time which is proportional to the desired reduction. Maximum time is 250 ms.
DRIVE SIGNAL
Information about the current gear position, P-N or R-D-1-2-3, is sent from pin 11 in the TCM connector to the MOTRONIC ECM.
MOTRONIC 2.10.2 receives the signal on pin 47.
When you go to any one of the R, D, 1, 2, or 3 gear positions from position N, the transmission sends battery positive voltage to pin 11. Otherwise the voltage is 0 V. The intention is to inform the MOTRONIC ECM of the intention to move (forwards or backwards) and that the corresponding gear has been selected. The MOTRONIC ECM carries out idling compensation.
The idling compensation is made possible by the MOTRONIC ECM opening the Idle Air Control (IAC) valve above a normal value and the idling speed can thus be maintained.
If the signal fails to appear, the idling speed will fall below 900 rpm when DRIVE position is selected and then slowly rise to normal idling speed.
RECOMMENDATIONS ON USAGE
Selector Lever Position P
Position P must only be selected when the car is at a standstill. The selector lever and the transmission are locked. The engine can be started.
Selector Lever Position R
Position R must only be selected when the car is at a standstill. This position cannot be selected without lifting the locking device.
Wait a short while to enable the reverse gear function to connect before you press the accelerator pedal.
Selector Lever Position N
In position N there is no connection between the engine and the transmission. The engine can be started. The parking brake should be applied to prevent the car from moving.
In order to avoid a rise in the temperature of the engine and the transmission, position N should be selected when standing still for lengthy periods.
Selector Lever Position D
Position D is the normal driving position. After having engaged the gear, wait a short while to enable the gear position to engage before you press the accelerator pedal. The transmission automatically shifts between gears 1-4. The gear shifting points depend on the position of the accelerator pedal and the speed of the car.
Selector Lever Position 3
In this position the fourth gear is blocked. The car starts in first gear and then shifts automatically between gears 1 - 3.
Position 3 is recommended for driving on roads with a lot of bends and in heavy town traffic.
If you move the lever from position D to position 3, the transmission shifts to third gear which gives better engine braking. The lever should not be moved to this position at speeds above 150 km/h.
Selector Lever Position 2
This position is to be preferred in mountainous areas. The engine's power is better utilized and engine braking is improved. The transmission shifts automatically between first and second gear. Third and fourth gears are blocked. The lever should not be moved to this position at speeds above 150 km/h.
Selector Lever Position 1
Position 1 should be selected when you want very powerful engine braking on very steep hills, up or down, to avoid frequent gear shifts which could result in overheating of the transmission fluid.
If the selector lever is moved from position D to position 1, the transmission immediately shifts down to third gear. Shifting to second gear takes place at about 115 km/h and to first gear at about 60 km/h. Manual down-shifting must not take place at speeds above 150 km/h. In position 1 all other gears are blocked.