Engine Controls - Trouble Shooting - No Codes: Introduction

Before diagnosing symptoms or intermittent faults, follow proper work flow. See SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - NSX & NSX-T article. If no Diagnostic Trouble Codes (DTCs) are present and a no start condition exists, proceed to BASIC DIAGNOSTIC PROCEDURES - NSX & NSX-T article. If no DTCs are present and a driveability condition exists, diagnose by symptom (i.e., ROUGH IDLE, ENGINE STALLS, etc.).

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.

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 SYSTEM & COMPONENT TESTING - NSX & NSX-T article. For specifications, see ON-VEHICLE ADJUSTMENTS - NSX & NSX-T or SERVICE & ADJUSTMENT SPECIFICATIONS article.