Engine Controls - System & Component Testing - 3.9L & 4.2L: Introduction: Notes
NOTE:
Defender service information is similar to Range Rover service information. Land Rover does not provide Defender specific service information.
CAUTION:
When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle.
NOTE:
For system and component testing information not covered in this article, see corresponding system or component fault code definition under TROUBLE CODE IDENTIFICATION CHART in appropriate SELF-DIAGNOSTICS article. Perform appropriate fault code test.
NOTE:
Testing individual components does not isolate shorts or opens. Perform all 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 wiring harness shorts or opens.
Before testing separate components or systems, follow proper workflow. If a no start condition exists, proceed to appropriate BASIC DIAGNOSTIC PROCEDURES article. If a driveability condition exists, proceed to appropriate TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, ENGINE STALLS, etc.).