Engine Cranks But Does Not Run

CIRCUIT DESCRIPTION
To start the engine, the correct air/fuel mixture must be compressed within the cylinder, and sparked at the proper time. This assumes that the vehicle battery condition and cranking speed is within specifications, and that an adequate amount of quality fuel is in the tank. The PCM controls fuel delivery, fuel metering, and spark timing. When the key is first turned ON, the PCM energizes the fuel pump to prime the fuel rail assembly. The PCM uses input from various information sensors to determine the correct amount of fuel to mix with the intake air, and 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 the Powertrain OBD System Check 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. Be sure to check the spark plugs for signs of fouling.

Check for leaks in the intake air ducting between the Mass Air Flow (MAF) sensor and the throttle body.

A malfunctioning MAF sensor may cause a no start or a stall after start. If this is suspected, disconnect the MAF sensor. The PCM will ignore the MAF sensor and default to the calculated air flow. If this corrects the condition and the connections are OK, replace the MAF sensor.

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

TEST DESCRIPTION

Steps 1 - 3:

Steps 4 - 13:

The numbers below refer to the step numbers on the diagnostic table:
6. Checks for proper fuel pressure to the fuel rail assembly.
7. The fuel system pressure test will locate the cause of fuel pressure that is below specifications. However, if no fuel pressure is available, the fuel pump may be faulty.
9. If the engine does not enter Clear Flood Mode at the first indication of a flooding condition, a no start condition may occur due to excess fuel fouling the spark plugs.
10. A faulty splice connection in the underhood fuse block assembly will interrupt the ignition voltage supply to both ignition module assemblies.