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Transmission Control, Function - GF27.60-D-2002HAG

TRANSMISSION 722.9 in MODEL 906 

Function requirements for transmission control, general 

Transmission control, general 

The transmission control actuates the following actuators electronically:

The control solenoid valves are located in the hydraulic valve body assembly. This implements the hydraulic functions.

The function of the electric controller unit (Y3/8) basically consists in the evaluation of various input signals relevant to the transmission function. Depending on this the control solenoid valves are actuated which for their part determine the working pressure, the gear ratio of the transmission (gear selection), and the torque converter lockup.

Transmission control function sequence 

The function sequence is described in the following steps:

Function sequence for basic shift program 

The basic shift program includes upshift and downshift characteristics for all 7 gears, designed for:

The shift programs are adapted by offsetting the characteristics, depending on:

The control unit monitors and shifts depending on:

Slow accelerator release:

Rapid accelerator release:

Function sequence for electronic and hydraulic transmission control 

Whilst the electronic transmission control takes over the gear selection and adaptation of pressures to the torque to be transmitted, the power supply control of the transmission takes place via the hydraulic elements of the electric controller unit. The oil supply for the hydraulic elements such as actuators, torque converters and hydraulic transmission control is provided through an oil pump (primary pump) connected to the torque converter or through the electric transmission oil pump (M42) (with code (MJ7) ECO start). The transmission control system makes possible a precise adaptation of pressures to the respective operating states and to the engine output during the gearshift phase, resulting in a significant improvement in shift quality.

It is possible to reach the engine RPM limit in the individual gears using full throttle and kickdown.

The transmission control system prevents impermissibly high engine speeds with a downshift lockout device. Furthermore, the transmission control system offers the advantage of a flexible adaptation to various vehicle and engine versions.

IMPORTANT With code (MJ7) ECO start, the electric transmission oil pump ensures that the hydraulic system is supplied with oil when the internal combustion engine is switched off. It also supports the primary pump when the combustion engine is operating in the low speed range. This is actuated through the transmission oil auxiliary pump control unit (N89).

Function sequence for kickdown 

The driver's wish for maximum acceleration is met by the kickdown function.

The kickdown function is activated as of a pedal travel > 90 %. The "Kick-down" signal is sent by the CDI control unit (N3/28) (with engine 651) or the CDI control unit (N3/30) (with engine 642) over the engine compartment-CAN to the control unit.

Based on this information the control unit actuates the control solenoid valve so that the upshifts and downshifts take place at increased engine speed in order to achieve maximum performance. The forced downshift into the next lower gear is performed when transmission temperatures are too high and lower vehicle speed.

Function sequence for limp-home mode 

If the signals are implausible, the transmission control system is only partially operational and switches to the programmed emergency performance map.

The driver can use the ESM control unit (N15/5) selector lever to select the desired gear ranges "P, R, N, and D".

The driver can choose been forward and reverse travel, engage the park pawl or, when in neutral, interrupt the power flow between torque converter and transmission.

CDI control unit, component description N3/28
Engine 651.9		 GF07.16-D-6000HD
  N3/30
ENGINE 642.898 in MODEL 906
with CODE (MG5) Engine OM 642 DE 30 LA, 140 kw (190 hp) 3800 RPM
with CODE (MH1) Low-pollutant engine EPA 10/CARB
with CODE (ZU7) Canada national version
ENGINE 642.898 in MODEL 906
with CODE (MG5) Engine OM 642 DE 30 LA, 140 kw (190 hp) 3800 RPM
with CODE (MH1) Low-pollutant engine EPA 10/CARB
with CODE (ZU8) USA national version
* Only for USA, Canada, Mexico		 GF07.16-D-6000HU
  N3/30
ENGINE 642.8 in MODEL 906
with CODE (MG5) Engine OM 642 DE 30 LA, 140 KW (190HP) 3800 RPM
except CODE (ZU7) Canada national version except CODE (ZU8) USA national version		 GF07.16-S-6000SA
Electronic selector lever module control unit, component description N15/5 GF27.19-D-5300H 
Transmission oil auxiliary pump control unit, component description N89
With code (MJ7) ECO start		 GF27.19-D-4030HAG 
Fully integrated transmission control unit, component description Y3/8n4 GF27.60-D-5165HAG 
Electric transmission oil pump component description M42
With code (MJ7) ECO start		 GF27.57-D-1020HAG 
Electric controller unit, component description Y3/8 GF27.19-D-5145HAG 
Working pressure control solenoid valve, component description Y3/8y1 GF27.19-D-5170HAG 
K1 clutch control solenoid valve, component description Y3/8y2 GF27.19-D-5171HAG 
K2 Clutch control solenoid valve, component description Y3/8y3 GF27.19-D-5172HAG 
K3 Clutch control solenoid valve, component description Y3/8y4 GF27.19-D-5173HAG 
B1 Multidisk brake control solenoid valve, component description Y3/8y5 GF27.19-D-5174HAG 
B2 multidisk brake control solenoid valve, component description Y3/8y6 GF27.19-D-5175HAG 
B3 Multidisk brake control solenoid valve, component description Y3/8y7 GF27.19-D-5176HAG 
Torque converter lockup clutch control solenoid valve, component description Y3/8y8 GF27.19-D-5177HAG 
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