Shift Selection and Gear Position

SHIFT SELECTION AND GEAR POSITION

Introduction
Operator gearshift control is effected by:
The selector lever
Accelerator pedal position
Kickdown
The mode switch

Operator's Selector Module ('J' Gate)









Parts List

Selector lever:
Gear selector positions are:
P Transmission mechanically locked, starting available*
R Reverse gear
N No power to the rear wheels (starting available)
D All 5 forward gears available (see Performance Mode Pushbutton)
4 Upshift to 4th gear only
3 Upshift to 3rd gear only
2 Upshift to 2nd gear only

Gearshift Interlock Manual Override*
The interlock system which locks the selector in P and prevents the ignition key from being removed, may be manually overridden in the event of an emergency.
1. With the parking brake applied
2. Remove the access blank using a suitable Torx bit
3. Insert a small screwdriver into the vacated hole
4. Push the screwdriver downwards, gently, and hold whilst simultaneously moving the selector from P towards R, but do not engage R until the tool has been removed
5. An audible warning may be heard when operation 4 is carried out
6. With the selector in N and the access blank replaced,,the vehicle may be started

Range Selection
The selector lever transmits operator demand to the transmission and TCM by means of a cable and Dual-Linear Switch (DLS).

The lever operates the transmission assembly selector shaft, only for P R N D, by means of a cable. Movement of the lever across the gate to 4, 3 and 2 positions disengages the cable from the selector lever and engages the DLS which controls gear selection electronically.

Gear selector module
Provides illumination of the decal relevant to the gear selected. This information is provided by CAN from the TCM, thus obviating the need for a dedicated illumination switch. Illuminates the security system Active LED on the gear selector surround, in response to an output from the BPM.

Transmission Switches





Performance Mode Pushbutton
The performance mode pushbutton:
Is mounted on the "J" gate surround.
This 'push-on push-off switch selects Normal or Sport mode ( push-on for Sport)
Is illuminated when Sport mode is selected.
Is hard-wired to the transmission control module.
With 'Normal' selected the transmission will start off in 2nd gear with kickdown to 1st being available.
'Sport' mode allows 1st gear engagement from rest and modifies values in the TCM shift point calculations to provide higher upshift speeds and enhanced availability of downshifts.





Kickdown Switch
The kickdown switch:
Is floor mounted under the accelerator pedal.
Is operated by pressing the pedal beyond the full throttle position.
Provides maximum acceleration on driver demand, by signaling the TCM to select the lowest gear to give maximum wheel torque.

Gear selector interlock solenoid
Prevents the gear selector lever from being moved from P, unless the ignition switch is in position 11, and the brake pedal is depressed.

Is controlled by an input from the BPM

Park position switch
Is hard-wired to the BPM

Detects when the gear selector lever is moved to the Park position

Dual-Linear Switch (DLS)
The TCM detects gear selection by means of a switch fitted to the 'J' gate; the DLS contains two multi-track slider switches, of which the upper controls P R N D and the lower 4 3 2.

Output from the DLS is changed as the selector lever is moved, thus indicating selected gear position. The parallel signal is input to the TCM by 4 discrete logic wires W0, W1, W2 and W3. The particular sequence, or grey code, will indicate which shift position is selected, as shown in the following table where 0 = low and 1 high:





Grey code





Transmission Unit Gear Selector
The gear selector at the transmission unit:
Is connected to the operators selector module by cable
Operates the selector valve, at the electro-hydraulic control unit