Engine Controls - Tests W/O Codes: Introduction

Before diagnosing symptoms or intermittent faults, perform steps in appropriate BASIC DIAGNOSTIC PROCEDURES for Rodeo 2.6L, Passport 2.6L BASIC TESTING - 2.6L , Rodeo, Passport 3.2L and Trooper 3.2L BASIC TESTING - 3.2L articles. Use this article to diagnose driveability problems existing when a hard fault code is not present.

NOTE: Some driveability problems may have been corrected by manufacturer with a revised computer calibration chip or computer control unit. Check with manufacturer for latest chip or computer application.

Symptom checks can direct the technician to malfunctioning component(s) for further diagnosis. A symptom should lead to a specific component test, system test or adjustment.

Use intermittent test procedures to locate driveability problems that DO NOT occur when the vehicle is being tested. These test procedures should also be used if a soft (intermittent) trouble code was present, but no problem was found during self-diagnostic testing.

NOTE: FOR SPECIFIC TESTING PROCEDURES, SEE APPROPRIATE ARTICLES;

For Pickup 2.3L and 2.6L SYSTEM/COMPONENT TESTS - 2.3L & 2.6L

For Rodeo and Passport 2.6L SYSTEM/COMPONENT TESTS - 2.6L

For Rodeo and Passport 3.2L SYSTEM/COMPONENT TESTS - 3.2L

For Trooper DOHC SYSTEM/COMPONENT TESTS - DOHC

For Trooper SOHC SYSTEM/COMPONENT TESTS - SOHC .

NOTE: FOR SPECIFICATIONS, SEE APPROPRIATE ARTICLES;

For Pickup 2.3L ADJUSTMENTS - 2.3L

For Pickup 2.6L ADJUSTMENTS - 2.6L

For Rodeo and Passport 2.6L ADJUSTMENTS - 2.6L

For Rodeo and Passport 3.2L ADJUSTMENTS - 3.2L

For Trooper ADJUSTMENTS or SERVICE & ADJUSTMENT SPECIFICATIONS article.