P0335

Crankshaft Position (CKP) Sensor Circuit:

Circuit Description
The Powertrain Control Module (PCM) supplies B+ and a ground to the Crankshaft Position (CKP) sensor. The CKP sensor sends a reference signal to the PCM seven times per revolution to indicate CKP position and engine speed. This signal is called the 7X reference signal because the signal occurs seven times per revolution. The seventh pulse is the sync pulse and is used for crankshaft position reference. The PCM can calculate when to pulse the ignition coils based on this information.

Conditions For Setting The DTC
The 7X resync counter goes greater than 15 within 4 minutes and 15 seconds.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history DTC is stored.

Conditions for Clearing the MIL/DTC
- The MIL will turn "OFF" after three consecutive ignition cycles in which the diagnostic runs without a fault.
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- DTCs can be cleared by using a scan tool.

Diagnostic Aids
- If the complaint was "Cranks but will not run" DTC P0335 may be set when attempting to start the engine more than 15 times and the ignition is not turned "OFF" between attempts.
- An intermittent problem may be caused by a rubbed through wire insulation or a poor connection.
- An intermittent can also be the result of a defective reluctor wheel. Remove the crankshaft sensor and inspect the reflector wheel through hole. Check the porosity and condition of the wheel.

DTC P0335 - Crankshaft Position (CKP) Sensor Circuit:

Test Description
Numbers below refer to the step numbers 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
3. When a med. resync occurs, engine stumble also occurs. Whenever a component connection or wire is at fault, engine stumble may be induced by wiggling the circuit or connector
4. Operating a faulty non-engine related electronic components may emit electromagnetic interference's which may cause a med. resync.
10. Before replacing the PCM, check terminals for improper mating, broken locks, or physical damage to the wiring harness. Replacement PCM must be reprogrammed. Refer to the latest Techline information for programming procedures.