Symptom Related Diagnostic Procedures

CIRCUIT DESCRIPTION
In order to start the engine, the correct air/fuel mixture must be compressed within the cylinder, and sparked at the proper time. This condition assumes that the vehicle battery condition and the cranking speed are within specifications, and that an adequate amount of quality fuel is in the tank. The powertrain control module (PCM) controls the fuel delivery, the fuel metering, and the spark timing. When the key is first turned ON, the PCM energizes the fuel pump in order to prime the fuel rail assembly. The PCM uses input from various information sensors in order to determine the correct amount of fuel to mix with the intake air, and to determine the spark timing of the mixture over a wide range of starting conditions.

DIAGNOSTIC AIDS

NOTE: Refer to Connector Test Adapter kit J 35616-A Notice in Service Precautions.

To prevent mis-diagnosis, perform Diagnostic System Check-Computers and Controls Systems before performing this table. Initial Inspection and Diagnostic Overview

Unless the engine enters Clear Flood at the first indication of a flooding condition, a no start may result. Inspect the spark plugs for signs of fouling.

Inspect for leaks in the intake air ducting between the mass airflow (MAF) sensor and the throttle body.

If the steps above check OK, refer to Hard Start for diagnosis. Hard Start

TEST

Steps 1-7:

Steps 8-11: