P0337

Diagnostic Chart:

Diagnostic Chart (cont'd):

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 the RPM so that the VCM can determine when to pulse the ignition coil, the fuel injectors, and the control ignition timing. This is a type D DTC.

Conditions for Setting the DTC
The following conditions will set the DTC:

^ The engine speed is less than 4000 RPM.
^ The MAF sensor is at least 5 g/s.
^ The crank sensor duty cycle less than 50% (or the ratio of High Ref to Low Ref is less than 0.18).
^ The engine speed scan tool 2400 RPM.

Action Taken When the DTC Sets
The VCM stores the DTC to the history if the VCM detects an intermittent problem.

Conditions for Clearing the MIL/DTC
The VCM turns the Malfunction Indicator Lamp (MIL) off after 3 consecutive driving trips without a fault condition present.

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 Important Preliminary Checks. Testing and Inspection

Test Description
The numbers below refen-to the step numbers on the diagnostic table.

2. This step determines if DTC P0337 is the result of a hard failure or an intermittent condition.
3. Determines if voltage is available to the CKP through the VCM.
4. If the feed circuit is shorted to ground, the test lamp will light. This step determines if the circuit is open or shorted to ground. It the circuit is OK, then the VCM connections or VCM is faulty.
5. This test checks the crank sensor, the crank sensor signal circuit and the VCM.