Engine Controls - Tests W/O Codes - 1.9L: Introduction
Before diagnosing symptoms or intermittent faults, perform basic diagnostic procedures in F - BASIC TESTING - 1.9L article and self-diagnostics in G - TESTS W/CODES - 1.9L article. Use this article to diagnose driveability problems existing when a hard Diagnostic Trouble Code (DTC) 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 an 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) DTC was present, but no problem was found during self-diagnostic testing.
NOTE:
For specific testing procedures, see I - SYSTEM/COMPONENT TESTS - 1.9L article. For specifications, see D - ADJUSTMENTS - 1.9L or the C - SPECIFICATIONS - 1.9L article.