P0339

CIRCUIT DESCRIPTION
The Crankshaft Position (CKP) sensor sends a reference signal to the Vehicle Control Module (VCM) in order to indicate the crankshaft position and RPM. The VCM uses this information in order to determine when to pulse the ignition coil, the fuel injectors and the control ignition timing. The DTC P0339 is a type B DTC.

CONDITIONS FOR SETTING THE DTC
The following conditions will set the DTC:

1. The MAF sensor is at least 5 g/s.
2. The change in the calculated engine speed is at least 1000 RPM.

ACTION TAKEN WHEN THE DTC SETS
The VCM will turn ON the Malfunction Indicator Lamp (MIL) after 2 consecutive driving cycles with the fault active.

CONDITIONS FOR CLEARING THE MIL/DTC
A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 40°F from the start-up coolant temperature and the engine coolant temperature exceeds 160°F during that same ignition cycle) or the scan tool clearing feature has been used.

DIAGNOSTIC AIDS
A poor connection, a rubbed through wire insulation, or a wire that is broken inside the insulation may cause an intermittent problem.

Thoroughly check any circuitry, that is suspected of causing the intermittent complaint for the following conditions:

^ Backed out terminals.
^ Improper mating.
^ Broken locks.
^ Improperly formed or damaged terminals.
^ Poor terminal to wiring connections.
^ Physical damage to the wiring harness.

Inspect the face of the CKP sensor for metal shavings. This could result in an intermittent DTC P0339.

Refer to Intermittents.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.

3. Checks the ignition feed circuit to the Crankshaft Position sensor.
5. Checks the duty cycle of the Crankshaft Position sensor.