P0335

Diagram Chart:

Electrical:

CIRCUIT DESCRIPTION

The Crankshaft Position (CKP) sensor works in conjunction with a 58 tooth reluctor wheel on the crankshaft. The ECM pulls the CKP sensor signal circuit tow and monitors the voltage on the circuit. As each reluctor wheel tooth rotates past the sensor, the sensor's internal circuitry causes a voltage to be applied to the signal circuit, creating a square wave signal used by the ECM. The reluctor wheel teeth are 6 degrees apart. Having only 58 teeth leaves a 12 degree span that is uncut. This creates a signature pattern that enables the ECM to determine the crankshaft position. The ECM can determine which two cylinders are approaching the top center based on the CKP signal alone. The Camshaft Position (CMP) sensor signal is used in order to determine which of the two cylinders is on a firing stroke. The ECM can then properly synchronize the ignition system, the fuel injectors and the knock control. This sensor is also used in order to detect misfire. Refer to DTC P0300 for information on misfire detection.

CONDITIONS FOR RUNNING THE DTC

- P1501, P1502, or P1503 not set.

- The engine speed is greater than 22 RPM.

CONDITIONS FOR SETTING THE DTC

The ECM has detected no CKP sensor pulses.

ACTION TAKEN WHEN THE DTC SETS

The ECM illuminates the Malfunction Indicator Lamp (MIL) and records the operating conditions in the Freeze Frame on the second consecutive drive trip that the diagnostic runs and fails.

CONDITIONS FOR CLEARING THE MIL/DTC

- The ECM turns off the MIL after three consecutive drive trips that the diagnostic runs and does not fail.

- A History DTC clears after forty consecutive warm-up cycles if no failures report by this diagnostic or any other emission related diagnostic.

- The ECM battery voltage is interrupted.

- The scan tool clears the MIL/DTC.

DIAGNOSTIC AIDS

Use the Connector Test Adapter Kit J 35616-A for any test that requires probing the ECM harness connector or a component harness connector. Using this kit will prevent damage to the harness connector terminals.

Check for the following conditions:

- Poor connections at the ECM or at the component. Inspect the harness connectors for any backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. Refer to Overall Vehicle Information / Diagrams / Diagnostic Aids for Checking Terminal Contact procedure.

- Misrouted harness. Inspect the harness in order to ensure that the harness is not routed too close to any high voltage wires such as spark plug leads, or too close to any high current devices such as the alternator, the motors, the solenoids, etc.

- Damaged harness. Inspect the wiring harness for any damage. If the harness appears to be OK, observe the scan tool while moving the related connectors and the wiring harnesses. A change in the display may help in order to locate the fault.

If the sensor signal is only affected when the harness is moved at a component, and there is no problem with the harness or the connections, the component may be damaged.

- Check the sensor for a proper installation. A sensor that is loose or not fully seated (causing an excessive air gap between the sensor and the reluctor wheel) may cause this DTC to set.

Refer to Symptoms / Intermittents.

TEST DESCRIPTION

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

8. Disable the injectors before sending a signal on the CKP circuit. The main injector connector is located at the back of the intake plenum toward the driver's side.

With the signal generator set to 54 mph, the scan tool should indicate approximately 900 RPM.