P0336

DTC P0336 CKP Sensor Circuit Performance




Circuit Description
The Crankshaft Position (CKP) Sensor is mounted in the front of the engine behind the harmonic balancer. The CKP sensor works in conjunction with a 3X (4x on V8 applications) reluctor wheel mounted on the front of the crankshaft. The CKP sensor has a B+ power supply, a ground, and a signal circuit.

As the crankshaft rotates, the reluctor wheel teeth interrupt a magnetic field produced by a magnet located in the sensor. The sensor's internal circuitry detects this field and produces a square wave which the VCM monitors on the signal circuit. The VCM uses this signal to accurately measure crankshaft velocity which is important to ignition control spark timing, fuel injector timing and for misfire detection.

If the VCM does not detect a CKP signal during engine cranking for a predetermined amount of time, this DTC will be set.

Conditions for Running the DTC
- The engine is cranking
- Four or more camshaft position signals are detected

Conditions for Setting the DTC
The crankshaft position sensor signal not detected for more than 0.5 second.

Action Taken When the DTC Sets
The VCM stores a history DTC when it detects an intermittent problem.

Conditions for Clearing the MIL/DTC
- The VCM 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 (coolant temperature has risen 22 °C (40 °F) from the startup coolant temperature and the engine coolant temperature is more than 70 °C (158 °F) during the same ignition cycle).
- Use the scan tool Clear Information function.

Diagnostic Aids
Inspect the face of the CKP sensor for metallic particles. This could result in an intermittent DTC.

Check for one of the following:
- A chipped or damaged reluctor wheel
- An incorrect reluctor wheel
- The incorrect alignment of the CKP sensor to reluctor wheel
- Excessive crankshaft end play Refer to Symptoms.

An intermittent may be caused by any of the following conditions:
- A poor connection
- Rubbed through wire insulation
- A broken wire inside the insulation

Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis.

If a repair is necessary, then refer to Wiring Repairs or Connector Repairs.

Steps 1 - 4:

Steps 5 - 9:

Steps 10 - 14:

Steps 15 - 17:

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if the DTC P0336 is the result of a hard failure or an intermittent condition.
3. This step checks the ignition feed circuit to the crankshaft position sensor.
4. This step checks the crankshaft position sensor ground circuit.
5. This step checks the crankshaft position sensor.