P0335

DTC P0335 Crankshaft Position (CKP) Sensor Circuit




Circuit Description
The electronic Ignition Control Module (ICM) sends a reference signal to the Powertrain Control Module (PCM) seven times per crankshaft revolution to indicate crankshaft position and RPM so that the PCM can determine when to pulse the ignition coils and control the ignition timing. This signal is called medium resolution (7X reference) because it occurs seven times per crankshaft revolution. The ICM applies 5 volts through the 7X reference circuit and, in effect, switches this circuit to ground for a very short period of time. The seventh pulse is the sync pulse and is used for crankshaft position reference.

Conditions for Setting the DTC
The CKP resync counter is more than 15 counts within 4 minutes and 15 seconds.

Action Taken When the DTC Sets
- The control module illuminates the malfunction indicator lamp (MIL) if a failure is detected during 2 consecutive key cycles.
- The control module sets the DTC and records the operating conditions at the time the diagnostic failed. The failure information is stored in the scan tool's Freeze Frame and Failure Records.

Conditions for Clearing the MIL/DTC
- The control module turns OFF the MIL after 3 consecutive drive trips when the test has Run and Passed
- A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. A warm up cycle occurs when the coolant temperature has risen 22° C (40° F) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70° C (158° F) during the same ignition cycle.
- Use the scan tool Clear Information function

Diagnostic Aids
- If the complaint was Cranks But Will Not Run, the DTC P0335 may set when attempting to start the engine more than 15 times and the ignition is not turned OFF between the attempts.
- A rubbed through wire insulation or a poor connection may cause an intermittent problem.
- A defective reluctor wheel can result in an intermittent. Remove the crankshaft sensor and inspect the reflector wheel through the hole. Check the porosity and condition of the wheel.

Step 1:

Steps 2 - 4:

Steps 5 - 7:

Steps 8 - 9:

Test Description
The numbers below refer to the step numbers on the Diagnostic Table.
4. When a Medium Resolution Resync occurs, engine stumble should also occur. If a component electrical connection or an electrical wire is malfunctioning, an engine stumble or a medium resolution resync may be induced by wiggling the circuit or electrical connector.