Questionzee4real. how do i fix my landrover disco. 2004 that cannot start if it is in parking but can start when a small pin on the gear lever(park-neutral switch) is pressed in and the car is placed on neutral
AnswerHi eZe:
I wonder if that's the 'wxyz' safety switch.
Here's an explanation that might help:
Gear position switch
The gear position switch outputs signals that are related to the position of the selector lever assembly. The switch is installed on the selector shaft on the left side of the gearbox. Slotted mounting holes allow the switch to be turned relative to the shaft for adjustment. A fly lead connects the switch to the vehicle wiring. Movement of the selector lever assembly turns the selector shaft, which operates six pairs of contacts in the switch.
The pairs of contacts are identified as the W, X, Y, Z, Park/Neutral and Reverse contacts. When closed:
- The W,X,Y and Z contacts output a 12V ignition supply from the BCU.
- The Park/Neutral contacts output an earth.
- The Reverse contacts output a 12V ignition supply from the passenger compartment fuse box.
The outputs of the W, X, Y and Z contacts are monitored by the EAT ECU and the BCU to determine the position of the selector lever assembly.
I've never replaced that and I've read its best to have an experienced mechanic do the job.
On the older Disco's there is a shifter clip problem and here is the fix for that:
"E" Clip Removal
1. Pop the cap off the top of the gear selector lever with a thin blade screwdriver.
2. Set the parking brake and chock the wheels.
3. Turn the ignition switch to ON and depress the brake pedal:
4. Place the gear selector lever between the Park and Reverse positions. This elevates the gear selector shaft and separates the "E" clip from the cam for easier access (figure 1).
5. Remove the old "E" clip with your fingers or a pair of needle nose pliers and discard.
6. Go to step 2 of the installation procedure.
CAUTION: The replacement clip is designed to be installed by hand, without the use of any tool.
If a tool is used to pry the clip into position, damage may occur causing poor grip on the plastic cam. Such damage will reduce the service life of the clip and requires installation of a new clip.
Installation
Brake Pedal Depressed
Ignition switch in ON
Parking brake SET
Cap off "T" Handle
Chock Wheels
1. If the old "E" clip is missing and the gear selector shaft is locked in position, grab the top of the gear selector shaft with your fingers or a pair of pliers and pull up. With the shaft raised, move the gear selector lever between Park and Reverse. Locate and remove the old "E" clip from the handle and discard.
2. Slip the new shifter clip (LRNA 3727) over the gear selector shaft as shown in figure 2. Pull rearward to seat the shifter clip in the groove on the gear selector shaft
3. Push the button on the side of the T handle to raise the cam and seat the shifter clip. With the button depressed, press down on the clip to insure the clip and cam are properly mated (figure 3).
4. Return the gear selector lever to Park, turn the ignition switch to OFF and remove the ignition key. If the key cannot be removed, the shifter clip is improperly installed. Repeat step 3, taking care to insure that the shifter clip is properly seated on the cam (figure 3).
5. Remove the chocks from the wheels.
credit: C.St-Louis
