Section 16 (Engine Control System Self-Diagnostics): Introduction

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: This article applies only to the gasoline engine used in this vehicle and does not apply to the hybrid vehicle control system which consists of A/C motor and high-voltage system. For diagnosis of the hybrid vehicle control system, consult authorized dealer.

WARNING: Read service precautions before proceeding with service procedure. See SERVICE PRECAUTIONS .

NOTE: Before performing testing procedures, check for any related Technical Service Bulletins (TSBs).

To properly diagnosis and repair this vehicle, follow TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM. If no Diagnostic Trouble Codes (DTC) are present and a no start condition exists, proceed to BASIC DIAGNOSTIC PROCEDURES - 4-CYLINDER . If no DTCs are present and a driveability condition exists, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, ENGINE STALLS, etc.).