Engine Controls - System/Component Tests - 3.3L (CNG): Introduction

NOTE: Testing procedures not covered in this article require a Chrysler Diagnostic Readout Box (DRB). See TESTS W/CODES - 3.3L CNG article in the ENGINE PERFORMANCE section.

NOTE: For component location, see THEORY/OPERATION - 3.3L CNG article in the ENGINE PERFORMANCE section.

Before testing individual components or systems, perform procedures in BASIC TESTING - 3.3L CNG article in the ENGINE PERFORMANCE section. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform procedures in TESTS W/CODES - 3.3L CNG article in the ENGINE PERFORMANCE section.

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

The following engine components (as used on CNG vehicle) are identical to components used on gasoline equipped vehicles. For component testing, see SYSTEM/COMPONENT TESTS - 3.3L GASOLINE article in the ENGINE PERFORMANCE section.

Throttle Body
Accelerator Linkage
Manifold Absolute Pressure (MAP) Sensor
Engine Coolant Temperature Sensor
Intake Manifold
Intake Manifold Charge Air Temperature Sensor (5.2L)
Throttle Position Sensor
Idle Air Control Motor (Automatic Idle Speed)
Crankshaft Position Sensor
Automatic Shutdown Relay
Oxygen Sensor
Vehicle Speed Sensor
Ignition System
Air Conditioning Components
Speed Control Components
Overdrive Components
Alternator (Generator)
Park/Neutral Position Switch
Brake Switch Controls