LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Land Rover >> 2000 >> Discovery >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Introduction
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Engine Controls - System & Component Testing: Introduction

Before testing separate components or systems, follow proper workflow. See DIAGNOSTIC PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article. If no Diagnostic Trouble Codes (DTC) are present and a no-start condition exists, proceed to appropriate BASIC DIAGNOSTIC PROCEDURES article. If no DTCs are present and a driveability condition exists, proceed to appropriate TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, ENGINE STALLS, etc.).

Discovery is equipped with Generic Engine Management System (GEMS). 1999-2000 Range Rover and Discovery Series II are equipped with Bosch Motronic 5.2.1 engine management system.

NOTE: Testing individual components does not isolate short or open circuits. Perform all resistance and voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate shorted or open wiring harness.
scientia non olet · About LEMON Manuals