P0339

Diagnostic Chart:

Wiring Diagram:

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.

CONDITIONS FOR SETTING THE DTC

The Mass Air Flow (MAF) sensor is at least 5 g/s.

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

^ The VCM turns the MIL OFF after 3 consecutive drive trips when the test has Run and Passed and not Failed.

^ 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 start-up coolant temperature and the engine coolant temperature exceeds 70°C (160°F) during the same ignition cycle).

^ Use the scan tool Clear Information function.

^ Disconnect the VCM battery feed for 30 seconds.

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 Symptoms.
Testing and Inspection

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.