P0335

CIRCUIT DESCRIPTION
The crankshaft position (CKP) sensor is a hall-effect type of sensor that monitors the CKP and the speed. There are four teeth 90 degrees apart on the front of the crankshaft sprocket that induce a pulse in the sensor, this pulse is transmitted to the powertrain control module (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 8 consecutive crank pulses are missing.

ACTION TAKEN WHEN THE DTC SETS
^ The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
^ The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
^ A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
^ Clear the MIL and the DTC with 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

Steps 1-10:

Steps 11-18:

The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if DTC P0335 is the result of 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.