ZF Automatic Transmissions Service Manual
2.1.6 Transmission Rotary Switch
This switch is located on a square extension of the transmission selector shaft and is linked to the shift lever via the
selector cable. The switch comprises a selector bar which moves across a series of copper segments located on the
switch quadrant. The copper segments are set out in seven bands, each band providing an electrical output or com
- bination of outputs to the TCM.
The electrical outputs to the TCM are in the form of a three
-digit code which takes up three of the seven bands of the
quadrant; the remaining four bands are used for reverse, ground and start inhibit.
2.1.7 Decoder Module
The decoder module, located on the right hand side of the J-gate assembly, is used to translate the three-digit codes
from the rotary transmission switch into single-line functions to feed the illumination module and to provide the fol-
lowing information:
. Cruise control, ie when cruise control can or cannot be engaged.
. Indication when the vehicle is not in 'P' Park.
. Provide the ECM with a Park/ Neutral signal.
2.1.8 Performance Mode Switch
This switch, located on the shift lever surround, provides two alternative shift patterns:
. 'Normal Mode' -for everyday use,
. 'Sport Mode'- gear changes take place at higher road speeds in order to enhance performance.
Note: Torque converter 'lock-up' occurs in fourth gear in each mode.
2. I. 9 'Kick-down' Mechanism
'Kick-down' is activated by the final travel of the accelerator pedal which contacts a floor-mounted switch located be- hind the pedal. Operation of the switch provides a signal to the TCM that a downward change is required. The switch
is adjustable to ensure that the pedal does not overtravel and stretch the cable.
2.1.10 Reverse Safefy Inhibit
If 'R' Reverse is selected when the vehicle is travelling forwards at more than 5 mile / h, solenoid valve MV2 will be
energised to prevent engagement of reverse gear.
2.1.11 Gearshift hterlock
A brake pedal /gearshift interlock is incorporated in the gear selector mechanism. The gear selector lever may only
be moved from the P - Park position if the ignition key switch is in position II and the foot brake is applied.
The ignition key cannot be removed from the ignition switch unless the shift lever is in
the 'P - Park position. Once
the ignition key has been removed, the shift lever is locked in the park position.
2.1.12 Starter Inhibit Switch
The starter inhibit switch prevents the starter motor from being operated when the shift lever is not in position 'P' - Park or position 'N' - Neutral. The switch is located in the gear selector housing.
issue 1 August 1994 47
ZF Automatic Transmissions Service Manual
Vehicle speed sensor plus input
Engine speed input
Program switch input
Solenoid valve
MVI output
Pressure control valve PCV output
?. 1.13 Harness Connections
3&31 not used
32
33 Position code
Z input
38 Torque
reduction
T (I) output
34
-37 not used
Vehicle speed sensor minus input
37
55
not used
\I
41 I Kick down switch input
J" i"
Diagnostic L-line
Transmission malfunction indicator lamp
output
not used
Solenoid valves plus input
Vehicle speed sensor screen
Engine torque signal
T(T) input
I IU,MW II
43 not used
44 Oil temperature sensor ground
45 not used
46
Oil temperature sensor input
47 Throttle position input
48 not used
I
not used
Solenoid valve
MV2 output
not used
Power ground input 19
49 Sport mode indicator output
50 Position code X input
51 Diagnostics K
-line
52
-55 not used
J86 I I69 1
Fig.
1 Transmission Control Module Connections - Pin Locations
I1
12
13
: I
17-18
22
-23
t 27-28
25
26
Function I Pin I Function I
Power supply input I 29 I Program switch /Traction control input I
Digital ground input I 39-40 lnot used I
not used
-~
48 Issue 1 August 1994
