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HOMESERVICE MANUALSJEEP1994GRAND CHEROKEE SE, 4.0 S, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 4.0LINTRODUCTION
1994 Jeep Grand Cherokee SE, 4.0 S, AWD

Engine Controls - System/Component Tests - 4.0L: Introduction

1994 Jeep Grand Cherokee SE, 4.0 S, AWDSECTION Introduction
NOTE: For Grand Cherokee with 5.2L engine, see appropriate SYSTEM/COMPONENT TESTS - 5.2L article in the ENGINE PERFORMANCE section.

Before testing separate components or systems, perform procedures in appropriate BASIC TESTING - 4.0L article in this section below. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform procedures in TESTS W/CODES - 4.0L article in this section.

NOTE: Testing individual components does not isolate possible short or open circuits. Unless stated otherwise in test procedure, perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) having a minimum 10-megohm input impedance. Use ohmmeter to isolate wiring harness short or open circuits.
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When to See a Mechanic

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

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