Engine Controls - System/Component Tests - 3.8L: Introduction

1994 Plymouth Voyager LE, 3.3 RSECTION Introduction
NOTE: Testing procedures not covered in this article require a Chrysler Diagnostic Readout Box (DRB). See appropriate TESTS W/CODES - 3.8L article in the ENGINE PERFORMANCE section.

Before testing individual components or systems, perform procedures in BASIC TESTING - 3.8L article in the ENGINE PERFORMANCE section. Since many computer controlled and monitored components set a fault message if they malfunction, also perform procedures in TESTS W/CODES - 3.8L article in the ENGINE PERFORMANCE section.

NOTE: Testing of individual components does not isolate possible shorts or opens in wiring harness of electronically controlled systems. Perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance unless otherwise instructed in procedure. Use an ohmmeter to isolate wiring harness shorts or opens.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.