Installation Instructions for Land Rover Discovery 5 3.0L Stealth Module (2017-2020)

Included With Purchase

(1x) Stealth Module

(1x) Wire Harness with Fuel Rail Sensor Connections

(1x) Selector Switch

Module

Module

Step by Step Instructions

Let your truck sit with the hood popped, doors shut and the key fob away from the vehicle for at least 20 minutes. It is important to keep the key fob away and the doors shut during the entire installation process. DO NOT bring the key fob near the vehicle or open any doors until AFTER the module is fully installed and connections are verified. This allows the computer to 'sleep' and for your engine compartment to cool down. Failure to do so will result in a check engine light on startup.

Step 1:

Open hood and remove plastic engine cover. The engine cover is sitting on top of the engine without any fasteners. Gently pull straight up on the cover and it will release.

Sensor Connections

Step 2:

Locate your engine's fuel pressure sensor on the passenger side of the engine. See figure 1 and 2. Please note the orientation of the factory plug. There is a push release tab on the sensor plug, do not attempt to force this tab if it doesn’t want to release. If there is difficulty releasing the sensor, push the sensor aft while simultaneously squeezing the release tab. Once you hear/feel the plug release keep squeezing the plug to remove.

Sensor Connections

Step 3:

The Stealth Module installs in line with your factory engine harness to the fuel pressure sensor. Recalling the factory plug orientation, install the modules harness to the fuel pressure sensor. The plug will snap into place, give this plug a slight tug to insure it is seated fully. Continued...

See figure 3. The last plug connects to the vehicles harness. See figure 4. This plug will only correctly fit one direction and snap into place. Just like with the previous connections, gently try to separate these connectors to ensure proper seating.

Step 4:

Locate the Stealth Module, main wiring harness, and switch harness for assembly. The large gray connector on the main harness will connect directly to the module. Be sure to push the plug in so that both release tabs are locked. Connect the selector switch harness to the main module harness via the two white plugs

Step 5:

Store the Stealth Module away from the engines moving and exhaust related parts. The passenger side fender well near the firewall is a common area for installation. The switch can be ran into the cabin of the vehicle or left tied up under the hood on your desired setting for ease of removal prior to service.

Step 6:

Reinstall Engine cover by aligning the two aft stand offs by pushing down on the cover, then the forward two standoffs. Double check all connections and that wiring is routed away from any engine critical areas. Close hood and enjoy.

Turn Dial Clockwise

Stock - Low - Medium - High

Low - Towing at or near the vehicles maximum legal tow rating and low traction situations.
*consult your owners manual for vehicle tow rates

Medium - Moderate towing, around the middle of your vehicles tow rating, and ideal for everyday driving situations.

High - Maximum performance. Ideal for empty highway cruising.

The switch must remain plugged into the Stealth Module to remain in the desired setting. Do not switch power levels with the engine running.

You will see the best results when the selector switch is left in one setting for as long as possible.

Check Engine Light or Hard start on Install?

The most common reason for a check engine light on install is due to the truck not being asleep. If the Stealth Module has already been removed, please start the installation process over while giving special attention to the instructions above step 1. If the Stealth Module is still installed, verify connections and disconnect the negative terminals on your battery for a hard reset. Events that will wake the truck up: Not letting it sit for 15 minutes, opening/closing the vehicle door, having the key near the truck during install.

The most common reason for a hard start on install is due to improver connection. Please verify that all connections are straight and pushed in all the way. Be sure the harness is pushed in tight to the Stealth Module as well.

If you are still having trouble, please give our 24/7 tech support a call at (888) 613-4304

Remove the Stealth Module Before Service

Before going in for service, please remove the Stealth Module so that the truck is back to stock. This allows the technician to have a fresh base line when performing any work.