Engine Cranks, But Will Not Run

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

NOTE:: The Camshaft Position (CMP) Sensor is only used for misfire detection and is not part of the ignition system.

This engine is equipped with a distributorless ignition system called, the Electronic Ignition (EI) system. The primary circuit of the EI system consists of two separate ignition coils, an Electronic Ignition Control Module (ICM) and Crankshaft Position (CKP) sensor as well as the related connecting wires and the ignition control portion of the PCM. Each secondary circuit consists of the secondary winding of the coil, two connecting metal strips are molded into the coil housing, the spark plug boot/connector assemblies and spark plugs.

DIAGNOSTIC AIDS

^ A small amount of resistance in the Battery Positive voltage circuit may cause a no start with a functioning Malfunction Indicator Lamp (MIL). Check circuit C2-03 for resistance.

^ Check the Throttle Position (TP) sensor for binding or sticking or for being intermittently shorted or open.

^ If the THEFT SYSTEM telltale is flashing on the Instrument Panel Cluster (IPC), the theft deterrent system has been activated, refer to DTC P1629 Theft Deterrent Crank Signal Malfunction for further diagnosis.

^ Check for water or foreign material in the fuel system.

^ Check for a basic engine problem (low compression).

^ Verify that only resistor spark plugs are used.

^ A scan tool can be used to energize the fuel pump ON to check fuel pump operation and for ignition voltage at the injector harness.

TEST DESCRIPTION

Number(s) below refer to the step number(s) on the Diagnostic Table.

1. The OBD System Check prompts the Technician to complete some basic checks and store the Freeze Frame Data and the Failure records on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. This information on the scan tool can be referred to later.

7. This verifies that the fuel injectors are receiving proper voltage.

8. The fuel pump should be turned ON by the PCM for 2-3 seconds after ignition is first turned ON. Turn the ignition OFF for at least 10 seconds to assure that the PCM powers down. The PCM will then switch the fuel pump back ON. Whenever the fuel pump does not operate, Table A-5 should be used to diagnose the cause.

11. Battery voltage should be available at terminal C of the CKP sensor harness, and terminal B should be a good ground.

12. By grounding the test light to terminal B and B+, ensures the integrity of the ground circuit.

13. The CKP Activity Counter should go to 256 counts, before starting back at 0. At this point it is important that the CKP Activity Counter is incrementing.

14. This verifies a frequency output from the PCM.

18. It ignition control A and ignition control B are shorted together, there will not be a frequency signal. This step determines it ignition control A and ignition control B are shorted together.

23. Thoroughly examine the CKP sensor connector. It should be free of corrosion and contaminants, and pins should be making proper contact.

26. This will verify if the open circuit is in the ICM or the circuit.