P0335

Circuit Description
The Crankshaft Position Sensor is a Hall-effect type of sensor that monitors the crankshaft position and the speed. There are four teeth 90 degrees apart on the front of the crankshaft sprocket that induce a pulse in the sensor that is transmitted to the PCM. This signal allows the PCM to determine Top Dead Center (TDC) and RPM.

Conditions for Running the DTC
The engine is operating.

Conditions for Setting the DTC
^ Eight consecutive crank pulses are missing.
^ An average of eight consecutive crank pulses are missing.

Action Taken When the DTC Sets
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) on the first drive trip the diagnostic runs and fails.
^ The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, this information is stored in the Freeze Frame and/or Failure Records.

Conditions for Clearing the MIL/DTC
^ The PCM will turn the MIL off after three consecutive trips without a fault condition.
^ A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures
^ The use of a scan tool.

Diagnostic Aids
When the PCM is in backup fuel, long crank times, fast idle and poor performance conditions will exist. Check for a good connection at the crankshaft position sensor and at the PCM. Many intermittent problems are caused by poor electrical connections or wiring. When attempting to diagnose an intermittent problem, always begin by trying to reproduce the conditions under which the failure occurs. This usually involves raising the engine to a higher temperature or operating the engine near the RPM where the problem occurs. Since heat and vibration are often the cause of the intermittent, this may bring out the failure.

Test Description
Number(s) below meter to the step number(s) on the Diagnostic Table.
2. This step will determine if DTC P0335 is the result to a hard failure or an intermittent condition.
4. This step checks the 5 volt reference circuit (the 5 volt reference may vary slightly).
5. This step checks the ground circuit.